KR100837744B1 - Image display device and image adjusting method - Google Patents

Abstract

The present invention provides an image display device capable of easily performing flexible image adjustment according to a user's preference and an image adjustment method thereof. Since the storage unit 14 stores a plurality of gradation characteristics including custom characteristics that the characteristics themselves used for image adjustment can be customized, the projector 100 selects the gradation characteristics. ), And can be chosen according to the user's various preferences. In addition, when an operation of selecting the gradation characteristic from the selection screen is performed, the image signal processing unit 16 adjusts the gradation characteristic of the image signal according to the selected gradation characteristic, and projects the image by the adjusted image signal. The projector 100 projects an image including the adjustment contents on the background of the selection screen at the step of selecting the adjustment contents.

Image display device, storage unit, projector, option, image signal processing unit, selection screen

Description

Image display device and image adjustment method thereof {IMAGE DISPLAY DEVICE AND IMAGE ADJUSTING METHOD}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of the daily use of the projector according to the first embodiment.

2 is a schematic configuration diagram of a projector.

Fig. 3A is a diagram showing an example of input / output characteristics of the gradation point adjusting unit.

Fig. 3B is a table showing the gradation amount per step for each adjustment point.

Fig. 4A is a graph showing an example of the VT characteristics of the liquid crystal light valve.

4B is a graph showing an example of input / output characteristics of the gamma correction unit.

Figure 5 (a) is an enlarged view of a selection cursor in one aspect.

Fig. 5B shows one aspect of the selection state of the image site by the selection cursor.

Fig. 6 is a flowchart for explaining the operation of the projector when performing gamma adjustment.

Fig. 7A shows one aspect of the selection screen.

Fig. 7B is a diagram showing one aspect of the branch screen.

Fig. 8 is a flowchart for explaining the operation when customizing the gray scale characteristic by the cursor adjustment mode.

Fig. 9A is a diagram showing one aspect of the property confirmation screen.

Fig. 9B is a diagram showing one aspect of the gradation adjustment screen;

Fig. 10A shows one aspect of the property confirmation screen.

Fig. 10B shows one aspect of the continuation confirmation screen.

Fig. 11 is a diagram showing one aspect when an operation screen is displayed superimposed on an image.

Fig. 12 is a flowchart for explaining the operation when customizing the gradation characteristic by the graph adjustment mode.

Fig. 13 (a) is a diagram showing one aspect of the property confirmation screen;

Fig. 13B is a diagram showing one aspect of the gradation adjustment screen;

Fig. 13C shows one aspect of the property confirmation screen.

FIG. 14 is a flowchart for explaining the operation of the projector when performing gamma adjustment in the second embodiment; FIG.

Fig. 15A is a diagram showing one aspect of the selection screen.

Fig. 15B is a diagram showing one aspect of the branch screen.

Fig. 16 is a flowchart for explaining the operation when the gradation characteristic is customized by the cursor adjustment mode.

17 (a) and 17 (b) show one aspect of the graph adjustment screen;

Figure 17 (c) is a diagram showing one aspect of a continuation confirmation screen.

Fig. 18 is a flowchart for explaining the operation when customizing the gradation characteristic by the graph adjustment mode.

19 (a) and 19 (b) show one aspect of the graph adjustment screen;

* Explanation of symbols for the main parts of the drawings

1: control panel 2: remote control

5R, 5G, 5B: Liquid Crystal Light Valve 10: Control Unit

14: Memory unit 16: Image signal processing unit

18: OSD memory 20: OSD unit

21: gradation point adjustment unit 22: gamma correction unit

23: CPU section 51: selection cursor

52: pixel selection part 53: annular part

100: Projector gradation 1 to gradation 9: Adjustment point

G1, G10: Selection Screen G2, G11: Branch Screen

G3, G5, G7, G9: Characteristic confirmation screen G4, G8: Gradation adjustment screen

G12, G15, G16: Graph adjustment screen Vin, Din, Dcs: Picture signal

SC: screen

[Patent Document 1] Japanese Patent Laid-Open No. 2005-99620

The present invention relates to an image display device for displaying an image represented by an image signal and a method of adjusting the image.

Background Art An image display apparatus is known in which an image represented by an image signal can be adjusted in accordance with the contents of the image and the projection environment. For example, the projector of Patent Document 1 is provided with three types of image adjustment options, "dynamic", "natural", and "soft", and each adjustment is provided. The gamma value corresponding to the item is stored. The projector sets the γ value according to the selected adjustment item and performs gradation adjustment (hereinafter also referred to as “γ correction”) on the image signal.

However, when performing image adjustment in the conventional image display apparatus, it was necessary to select from a predetermined number of choices, and flexible adjustment could not be performed.

On the other hand, it is difficult to recognize in advance which part of the image is changed by the image adjustment, or to perform the desired image adjustment simply by increasing the adjustment item in order to enable flexible image adjustment. There is a problem that it becomes difficult to know which adjustment item to select.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide an image display device and an image adjustment method capable of easily performing flexible image adjustment according to a user's preference.

In order to achieve the above object, the image display device of the present invention comprises an image signal processing unit for adjusting an input gray level value included in the image signal in accordance with a predetermined gray scale characteristic with respect to an input image signal, and by the image processing unit. And a display portion for displaying an image based on the image signal including the adjusted output gray scale value, and a gray scale characteristic change portion for changing a correlation between the input gray scale value defined by the gray scale characteristic and the output gray scale value. It is done.

According to this configuration, a gray scale characteristic changing section for changing the correlation between the gray scale characteristic for adjusting the image signal, that is, the input gray scale value and the output gray scale value, is provided. Image adjustment can be performed.

In this image display device, an OSD unit for superimposing and displaying a selection screen for determining a gradation characteristic to be applied among a plurality of gradation characteristics including a custom characteristic whose correlation can be changed and superimposed on the image; And an operation unit that accepts a selection operation for selecting any one of the plurality of gradation characteristics and a determination operation for determining a gradation characteristic selected by the selection operation in the displayed state, wherein the image signal processing unit is adapted to the determination operation. It is preferable to adjust the image signal in accordance with the gradation characteristic determined by the above, and to adjust the image signal in accordance with the gradation characteristic selected in the step where the selection operation is performed in the state where the selection screens are overlapped. .

According to this configuration, since the adjustment according to the selected gradation characteristic is performed to the image signal at the stage where a selection operation for selecting one of the plural gradation characteristics is performed, the gradation characteristic to be applied is checked while checking the adjusted image. You can choose. That is, it becomes possible to easily select the gradation characteristic to be applied.

In this image display device, the gradation characteristic changing unit includes a characteristic confirmation screen including a selection cursor for selecting a desired image portion on the image and a graph indicating the correlation and a gradation adjustment screen for changing the correlation. An OSD section for superimposing the image, a start operation for initiating the change of the correlation, an image selection operation for selecting the image portion by the selection cursor, and an image portion selected by the image selection operation And an operation unit for performing an image determination operation for causing the image to be determined, and superimposing the selection cursor on the image when the start operation is performed; and superimposing the property confirmation screen on the image signal when the image selection operation is performed. On the graph, to the gradation value of the selected image part Indicate the response to adjustment point, and it is preferable that the image determining operation is completed, superimposing the tone adjustment screen for changing the relationship between the adjustment points in the image.

According to this configuration, when the image selection operation for selecting the image portion is performed, the gradation characteristic changing unit specifies an adjustment point corresponding to the gradation value of the selected image portion, and when the image determination operation for determining the selected image portion is performed. Since the gradation adjustment screen for changing the correlation at the adjustment point is displayed, it becomes possible to select an adjustment point from which the correlation should be changed from the image, so that the desired image adjustment can be easily performed. Further, in order to specify the adjustment point, the adjustment point may be flickered or displayed in a color tone different from that of other adjustment points.

In this image display apparatus, the gradation characteristic changing unit includes an OSD unit for superimposing a selection cursor for selecting a desired image portion on the image on the image, a start operation for starting the change of the correlation, and the An operation section for performing an image selection operation for selecting the image portion by a selection cursor, and if the start operation is made, superimpose the selection cursor on the image, and if the image selection operation is made, It is preferable to superimpose an image part having an approximately same gray level value, and to superimpose the gray level adjustment screen for changing the correlation in the lighted image part on the image.

According to this configuration, the gradation characteristic changing unit flickers the image portion having the same gradation value as the selected image portion when the image selection operation for selecting the image portion is made, thereby easily making the region to be changed in correlation. You can recognize it.

An image display apparatus of the present invention is an image display apparatus that displays an image represented by an image signal on a display unit, and includes a plurality of gradations including custom characteristics in which the characteristics themselves used for adjustment of the gradation characteristics in the image signal can be customized. Determine a storage unit for storing the characteristics, an OSD unit for superimposing a selection screen for selecting any one of the plurality of gradation characteristics in the image signal, an operation for selecting any one gradation characteristic from at least the selection screen, and selection contents And an image signal processing unit for performing image processing including adjustment of the gradation characteristics in the image signal. The image signal processing unit includes an image signal when the operation unit selects the gradation characteristics of the selection screen. Adjust the gray scale characteristic by the selected gray scale characteristic, One image is displayed on the display unit.

According to this configuration, since the storage unit stores a plurality of gradation characteristics including custom characteristics that the characteristics themselves used for image adjustment can be customized, the image display device has many options for gradation characteristics, and according to various preferences of the user. Depending on your choice.

The image signal processing unit adjusts the gradation characteristic of the image signal according to the selected gradation characteristic when the operation of selecting the gradation characteristic of the selection screen is performed by the operation unit, and displays the image by the adjusted image signal on the display unit. In the selection step of, the image including the adjustment contents on the background of the selection screen can be confirmed.

Therefore, the image display device of the present invention can adjust the image according to the preference of the user, and can confirm the image including the adjustment content in the step of selecting the adjustment content.

In this image display apparatus, it is preferable that the selection screen includes a graph showing a correlation between the input grayscale characteristic of the selected gray scale characteristic and the output grayscale level.

According to this configuration, since the selection screen includes a graph indicating a correlation between the input gray level characteristic and the output gray level, the graph showing the selected gray scale characteristic can be visually recognized.

Therefore, the image display apparatus of this invention can also confirm the graph which shows the gradation characteristic of the said image in addition to the image which contained the adjustment content in the selection step of the adjustment content.

In this image display apparatus, when an operation of selecting a custom characteristic of a selection screen and determining the selection content is performed by the operation unit, the image signal processing unit performs image processing on the image signal according to the gradation characteristic of the custom characteristic, and OSD The unit stops the overlapping of the selection screen, and superimposes a graph adjustment screen including a graph indicating the gradation characteristics of the initial setting of the custom characteristics on the image signal, and the graph adjustment screen is divided into a plurality of adjustment points set according to the input gradation level. In addition to indicating the output gradation level, it is preferable to have a plurality of dot display sections for adjusting the gradation characteristics.

According to this configuration, when the custom characteristic is selected and determined, a graph adjustment screen including a graph indicating the gradation characteristic of the initial setting of the custom characteristic is displayed, and the graph adjustment screen displays the output gradation for each of the plurality of adjustment points set according to the input gradation level. In addition to indicating the level, the display device has a plurality of dot display sections for adjusting the gradation characteristics. Thus, the gradation characteristics themselves can be adjusted while confirming the gradation characteristics of the initial setting of the custom characteristics on the graph adjustment screen.

Therefore, the image display device of the present invention can perform image adjustment in accordance with the user's preference while confirming the gradation characteristics by the graph.

In this image display apparatus, when an operation for selecting a custom characteristic of the selection screen and determining the selection content is performed by the operation unit, the OSD unit stops the overlapping of the selection screen and indicates the gradation characteristic of the initial setting of the custom characteristic. A plurality of dots indicating an output gradation level for each adjustment point in the graph are superimposed on the image signal by superimposing the characteristic confirmation screen as a graph on the image signal, and the image signal processing unit performing image processing on the gradation characteristics of the custom characteristics. When an operation of selecting one of the display units is performed, the OSD unit stops the superimposition of the property confirmation screen and superimposes a gradation adjustment screen smaller than the image for adjusting the output gradation level of the selected adjustment point on the image signal. Do.

According to this configuration, when the custom characteristic is selected and selected, the characteristic confirmation screen which is a graph showing the gradation characteristic of the initial setting of the custom characteristic is displayed. Therefore, the gradation characteristic of the initial setting of the custom characteristic can be confirmed by the characteristic confirmation screen.

In addition, when an operation of selecting any one of a plurality of dot display units indicating the output gradation level for each adjustment point in the graph of the property confirmation screen is performed, the OSD unit stops overlapping of the property confirmation screen and Since the gradation adjustment screen smaller than the image for adjusting the output gradation level is superimposed on the image signal, the gradation adjustment screen can adjust the output gradation level of the selected adjustment point.

Therefore, the image display device of the present invention can perform image adjustment in accordance with the user's preferences after confirming the gradation characteristics by the graph.

In this image display apparatus, when an operation for selecting a custom characteristic of a selection screen on the operation unit and determining a selection is made, the OSD unit stops overlapping of the selection screen and selects for selecting a desired image portion on the image. The cursor is superimposed on the image signal, the image signal processing unit stops the image by the image signal subjected to image processing based on the gradation characteristic of the custom characteristic, and the OSD unit is further configured to select an image portion by the selection cursor. If this is done, superimposing a graph adjustment screen on the image signal with a plurality of dot display sections each having an adjustable output gradation level indicating the output gradation level for each of the plurality of adjustment points set according to the input gradation level for adjusting the gradation characteristics. desirable.

According to this configuration, since the selection cursor is displayed with the determination of the selection of the custom characteristic as the trigger, and the image is stopped, the selection of the image portion by the selection cursor which is difficult when the image is moving is easily performed on the still image. I can do it.

Further, when an operation of selecting an image portion by the selection cursor is performed, a plurality of dots in which the output gradation level is adjustable, respectively, indicating the output gradation level for each of the plurality of adjustment points set according to the input gradation level for adjusting the gradation characteristics. Since the graph adjustment screen having the display portion is superimposed on the image signal, the gray scale characteristic itself can be adjusted while checking the gray scale characteristic by the graph adjusting screen.

Therefore, the image display device of the present invention can easily select a desired image portion, and can perform image adjustment according to the user's preference while confirming the gray scale characteristic by the graph.

In this image display apparatus, when an operation for selecting the custom characteristic of the selection screen and determining the selection content is made by the operation unit, the OSD unit stops overlapping the selection screen and selects a desired image portion on the image. The selection cursor is superimposed on the image signal, the image signal processing unit stops the image by the image signal subjected to image processing based on the gradation characteristic of the custom characteristic, and the OSD unit selects the image portion by the selection cursor. If this is done, it is preferable to superimpose the gradation adjustment screen for adjusting the output gradation level at the adjustment point of the gradation characteristic corresponding to the selected image portion on the image signal.

According to this configuration, since the selection cursor is displayed with the determination of the selection of the custom characteristic as the trigger, and the image is stopped, it is possible to easily select the image portion by the difficult selection cursor on the still image if the image is moving. .

In addition, since the OSD unit superimposes the gradation adjustment screen for adjusting the output gradation level at the adjustment point of the gradation characteristic corresponding to the selected image portion when the operation of selecting the image portion by the selection cursor is performed, The gradation adjustment screen can adjust the output gradation level of the selected adjustment point.

Therefore, the image display device of the present invention can easily select a desired image portion, and can perform image adjustment according to a user's preference.

Further, in this image display apparatus, the image signal processing section outputs the gray scale value of the image portion corresponding to the adjustment point in the image according to the gray scale level adjustment operation on the graph adjustment screen or the gray scale adjustment screen. It is preferable to adjust one by one according to the level.

According to this configuration, the image signal processing unit sequentially adjusts the gradation value of the image portion corresponding to the adjustment point in the image in accordance with the output gradation level in which the gradation level is adjusted on the graph adjustment screen or the gradation adjustment screen. Since adjustment is performed in turn, the image including the adjustment contents can be confirmed in real time in the step of adjusting.

Therefore, the image display device of the present invention can adjust the image according to the preference of the user, and can confirm in real time the image including the adjustment contents in the step of making the adjustment.

In this image display apparatus, when an operation of selecting a custom characteristic of a selection screen on the operation unit and determining the selection content is performed, it starts from the graph adjustment mode or selection cursor by the graph starting from the graph adjustment screen and the characteristic confirmation screen. Prior to the transition to the cursor adjustment mode, it is preferable that the OSD unit superimposes the selection screen and superimposes a branch screen for selecting either the graph adjustment mode or the cursor adjustment mode on the image signal.

According to this configuration, since the OSD unit superimposes the branch screen for selecting either the graph or the cursor adjustment mode in the image signal by triggering the selection decision of the custom characteristic, the graph adjustment mode or the cursor adjustment mode by the branch screen. You can choose either.

Therefore, the image display device of the present invention can select the adjustment method according to the preference of the user.

In this image display apparatus, the selection record in the graph or cursor image adjustment mode selected on the branch screen is stored in the storage unit, and the OSD unit stores the next time an operation for selecting a custom characteristic of the selection screen to the operation unit is performed. It is preferable to superimpose the branch screen in the state where the image adjustment mode of the selection recording in the negative portion is selected to the image signal.

According to this configuration, the selection record is stored in the storage unit, and when an operation for selecting a custom characteristic of the selection screen to the operation unit is made next time, the OSD unit branches in the state where the image adjustment mode of the selection record in the storage unit is selected. Since the screen is superimposed on the image signal, the branch screen is displayed with the user's selection record reflected. Therefore, the possibility that the user selects and operates the adjustment mode is reduced.

Therefore, the image display device of the present invention is convenient to use.

In this image display device, the size of the operation screen including the selection screen, the graph adjustment screen, the characteristic confirmation screen, the gradation adjustment screen, and the branch screen is preferably 1/4 or less of the image.

According to this configuration, since the size of the operation screen including the selection screen, the graph adjustment screen, the characteristic confirmation screen, the gradation adjustment screen, and the branch screen is 1/4 or less of the image, even if the portion hidden by the operation screen is excluded. 3/4 or more of the whole image can be confirmed.

Therefore, the image display device of the present invention can perform image adjustment while checking the state of the image.

In this image display device, an operation screen including a graph adjustment screen, a characteristic confirmation screen, a gradation adjustment screen, and a branch screen is an initial setting, which is disposed inside any one of four corners in an approximately rectangular image, and the OSD is displayed. The unit preferably moves the position of the operation screen within the range of the image so that the selected image portion does not overlap the operation screen.

According to this structure, since the operation screen is initially set inside any one of the four corners in the substantially rectangular image, the center portion, which is the center of the image, is not hidden by the operation screen.

In addition, since the OSD unit moves the position of the operation screen within the range of the image so that the selected image portion does not overlap the operation screen, it is possible to confirm the adjustment situation of the selected image portion which is most concerned at the time of adjustment.

Therefore, the image display device of the present invention can perform image adjustment while always checking the state of the image portion being adjusted.

In this image display apparatus, the gradation characteristic of the initial setting by default of the custom characteristic is changeable, and the gradation characteristic of any one of the plurality of gradation characteristics including the linear gradation characteristic stored in the storage unit is set. It is desirable to be.

According to this configuration, the gradation characteristic of the initial setting by default of the custom characteristic is changeable, and the gradation characteristic of any one of a plurality of gradation characteristics including the linear gradation characteristic stored in the storage unit is set. Based on the user's preference, the gradation characteristic as a base can be selected.

Therefore, according to the image display device of the present invention, it is possible to adjust the image according to the preference of the user.

In this image display apparatus, it is preferable that the custom characteristic adjusted in the graph adjustment screen or the gradation adjustment screen is stored in the storage unit, and displayed as one of the choices of the plurality of gradation characteristics when the selection screen is next displayed.

According to this configuration, the adjusted custom characteristic is stored in the storage unit, and the next time the selection screen is displayed, it is displayed as one of the options of the plurality of gradation characteristics, so that the adjusted custom characteristic can be easily stored and reproduced. have.

Therefore, the image display device of the present invention is convenient to use.

In this image display device, the image display device includes a light source unit for supplying light, a light modulator as a display unit for modulating the light emitted from the light source unit into modulated light representing an image defined in the image signal, and a modulated light. It is preferable that it is a projector having a projection lens for projecting.

Since the projector displays by projecting an image on a screen that is a projection surface, it is necessary to adjust the projection image to suit the projection environment according to the brightness of the projection environment, the color tone of the installed screen, and the like. For this reason, the frequency of image adjustment is high, and a more advanced image adjustment method is required.

According to this configuration, since the image display device is a projector that modulates the light emitted from the light source unit into modulated light representing an image defined in the image signal by the optical modulation element, and is a projector that enlarges and projects the projection lens, the large screen. Can be optimally adjusted to the projection environment by a plurality of gradation characteristics including customizable custom characteristics.

Therefore, the image display device of the present invention is most suitable for a projector.

An image display apparatus of the present invention is an image display apparatus which displays an image represented by an image signal on a display unit, which is a selection cursor for selecting a desired image portion on an image and input and output gradation levels of gradation characteristics at initial settings of the image. An OSD unit for superimposing a characteristic confirmation screen including a graph indicating a correlation between the image signal and a gradation adjustment screen for adjusting gradations for a plurality of adjustment points in the gradation characteristics of the image, and at least adjusting the gradation characteristics of the image; An operation unit which performs an operation for starting the operation and selection of an image portion by the selection cursor and an operation for determining the selected image portion, and performing image adjustment including adjustment of the gradation characteristics in the image signal, and performing image adjustment on the operation unit. Is made, the image is stopped, and the selection cursor is moved by the OSD unit. And an image signal processing unit for displaying on the visual field, and the OSD unit flashes an adjustment point corresponding to the gradation of the selected image portion or changes a hue of the adjustment point when an operation of selecting an image portion by a selection cursor is performed on the operation unit. And superimposing the gray scale adjustment screen of the adjustment point corresponding to the gradation of the selected image portion when the operation to determine the image portion selected by the operation unit is superimposed on the image signal. do.

According to this configuration, when an operation to perform image adjustment is performed, the image signal processing unit stops the image and displays a selection cursor for selecting a desired image portion on the image on the display unit. Therefore, if the image is a moving image, the image is changed, so it is difficult to select an image portion, but selection is easy by stopping the image. In addition, a desired image portion among still images can be selected by the selection cursor.

When the operation unit selects an image portion by the selection cursor on the operation unit, the OSD unit flashes the adjustment point corresponding to the gray level of the selected image portion or superimposes the characteristic confirmation screen on which the color tone of the adjustment point is changed on the image signal. Therefore, the position of the image portion in the gradation characteristic of the whole image is specified in the graph. Therefore, the adjustment point in the gradation characteristic of the whole image can be confirmed by a graph before performing gradation adjustment.

In addition, the OSD unit superimposes the gradation adjustment screen of the adjustment point corresponding to the gradation of the selected image portion on the image signal when an operation for determining the image portion selected by the operation unit is performed. Tone adjustment can be performed.

Therefore, the image display apparatus of this invention can select a desired adjustment site | part from a display image, and can adjust the image of the selected adjustment site | part after confirming the gradation characteristic of the whole image.

In this image display device, the image signal processing unit includes a gamma correction unit for correcting the intrinsic gradation characteristic in the display unit to any one of the basic gradation characteristics among a plurality of predetermined basic gradation characteristics so as to be suitable for at least the installation environment; A gradation point adjustment section for adjusting output gradation values for a plurality of adjustment points set in accordance with the input level in the basic gradation characteristics, and the gradation adjustment to the image signal by the image signal processing section are similar to the gradation correction in the gamma correction section. The gray scale adjustment is performed by combining the gray scale adjustment in the gray scale adjustment section. In the gray scale adjustment screen of the selected adjustment point, when the output gray scale value is adjusted, the gray scale point adjusting unit adjusts the output gray scale value of the adjustment point according to the adjustment contents. It is desirable to change.

The image signal processing unit includes a gamma correction unit for correcting at least one of the basic gradation characteristics among a plurality of predetermined basic gradation characteristics in order to make the display unit drop inherent gradation characteristics at least in the installation environment, and inputs in the basic gradation characteristics. Since a gradation point adjustment section for adjusting output gradation values for a plurality of adjustment points set in accordance with the level is provided, each function is performed as an independent dedicated component site. Therefore, since each structure can be dedicated, it can be set as a simple structure.

In addition, since the gradation adjustment to the image signal as the image signal processing unit is performed by the gradation characteristics obtained by combining the gradation correction in the gamma correction unit and the gradation adjustment in the gradation point adjustment unit, high gradation adjustment is performed by two adjustment sites. I can do it.

In addition, in the gradation adjustment screen of the selected adjustment point, when the output gradation value is adjusted, the gradation point adjustment unit changes the output gradation value of the adjustment point according to the adjustment contents, so that the image on the back of the gradation adjustment screen is adjusted in real time. The image is updated to reflect the contents.

Therefore, according to the image display device of the present invention, a simple gray scale adjustment configuration enables high gray scale adjustment, and it is possible to confirm an image reflecting the adjustment contents in real time.

In this image display device, the selection cursor includes a pixel selection unit having a size for selecting a plurality of consecutive pixels of three or more pixels in the pixels of the display unit, and the adjustment point of the gradation characteristics corresponding to the selected image portion is a pixel. The adjustment point of the input gradation level closest to the average value except the maximum and minimum gradation values in the gradation values for the plurality of pixels selected by the selection unit or the gradation values for the plurality of pixels selected by the selection unit is selected. It is desirable to be.

According to this configuration, since the selection cursor is configured to include a pixel selection section having a size for selecting a plurality of consecutive pixels of three or more pixels in the pixels of the display section, the selection cursor is based on the pixel data in the plurality of pixels having a width. The intended selection site can be determined.

Further, the adjustment point of the gradation characteristic corresponding to the selected image portion is the maximum and minimum gradation in the average value of the gradation values for the plurality of pixels selected by the pixel selection unit or in the gradation values for the plurality of pixels selected by the pixel selection unit. Since the adjustment point of the input gradation level closest to the average value except the value is selected, the influence by the pixel data including noise can be reduced and the adjustment point corresponding to the image portion intended by the user can be selected.

Therefore, the image display device of the present invention can accurately select the adjustment site intended by the user from the projected image.

In this image display device, it is preferable that the pixel selector has a size for selecting a total of 9 pixels in a rectangular shape consisting of 3 pixels each in length and width.

According to this configuration, since the pixel selector has a size for selecting a total of 9 pixels in a square shape consisting of 3 pixels each in length and width, the effective pixel data of 7 pixels is taken even if the average value is taken out of the pixels having the maximum and minimum gray scale values. Is obtained. Moreover, since it becomes a moderate size among all the images, it is easy to visually recognize it, and since it is a square shape, it is easy to select an image part.

Therefore, the image display device of the present invention can easily and accurately select the adjustment site intended by the user from the projected image.

In this image display device, the selection cursor further includes an annular portion including a shape in which a part of the outer shape of the pixel selection portion is further enlarged on the outer periphery of the pixel selection portion, and the annular portion always has a relative position with the pixel selection portion. It is preferable to hold and move the still image on the pixel selection unit.

According to this configuration, the selection cursor further includes an annular portion including a shape in which a part of the outer shape of the pixel selection portion is further enlarged on the outer periphery of the pixel selection portion, and the annular portion always maintains a relative position with the pixel selection portion, Since the moving image image is moved together with the selection portion, the selection cursor becomes a characteristic form having an annular portion larger than the pixel selection portion, and is displayed larger and more distinctly on the image.

Therefore, it is easy to select a desired image part by the selection cursor displayed clearly.

Therefore, according to the image display device of the present invention, the desired image portion can be easily selected by the selection cursor displayed clearly on the image.

In this image display device, the position of the pixel selection unit in the operation of selecting an image portion by the selection cursor is controlled by the image signal processing unit so that the entire picture of the pixel selection unit does not deviate from the still image, and the pixel selection unit is at the edge of the still image. When is reached, the selection cursor is preferably displayed in a state where a part of the images of the annular portion deviating from the still image are distorted.

According to this configuration, the position of the pixel selection portion is controlled by the image signal processing portion so that the entirety of the pixel selection portion does not deviate from the still image, and when the pixel selection portion reaches the edge of the still image, the selection cursor is located at a part of the annular portion deviating from the still image. Since the image is displayed in a distorted state, it is possible to select the image up to the image portion of the edge of the image by the selection cursor, and the selection cursor can be recognized even when the edge of the image is selected.

Therefore, the image display device of the present invention can select desired image portions in all effective image areas by the selection cursor.

In this image display apparatus, the color tone of the selection cursor is set to either white or black, and the OSD unit has a high contrast between the color tone of the image portion selected by the selection cursor and any one color tone of white or black. It is preferable to adjust the hue of the selection cursor with the hue of the side.

According to this configuration, since the OSD unit adjusts the hue of the selection cursor to the hue of the portion of the image selected by the selection cursor and the hue of the one with the higher contrast of either white or black, the hue of the selection cursor is visually recognized. It adjusts so that it becomes the color tone which it is easy to make.

Therefore, it is easy to select a desired image part by the selection cursor displayed clearly.

Therefore, according to the image display device of the present invention, the desired image portion can be easily selected by the selection cursor displayed clearly on the image.

An image display device of the present invention is an image display device for displaying an image represented by an image signal on a display portion, comprising: an OSD portion for superimposing a selection cursor for selecting a desired image portion on an image on the image signal, and at least an image gradation The operation unit which starts the adjustment of a characteristic and the operation which selects an image part by a selection cursor, and performs image adjustment which includes adjustment of the gradation characteristic to an image signal, and performs the image adjustment on an operation part, And an image signal processing unit for displaying a selection cursor by the OSD unit, and when the image portion is selected from the still images by the selection cursor, the selected image portion and the selected image portion in the still image. It is characterized in that the image portion having a substantially equal gradation is flickered.

According to this configuration, when an operation for adjusting the image is performed, the image signal processing unit stops the image and displays a selection cursor for selecting a desired image portion on the image on the display unit. Therefore, if the image is a moving image, the image changes, so it is difficult to select an image portion, but selection is easy by stopping the image. In addition, a desired image portion among still images can be selected by the selection cursor.

In addition, the image signal processing unit includes approximately the same gradation region when the image portion is selected from the still image by the selection cursor, since the selected image portion in the still image and the image portion having approximately the same gradation as the selected image portion are flickered. The selected image portion is displayed separately from other image portions by blinking. Therefore, the selected image part can be visually recognized clearly. In addition, even if the unexpected part is selected by this, it can identify at a glance.

Therefore, the image display device of the present invention can select a desired image adjustment portion from among the display images, and can visually recognize the selected image portion.

In this image display apparatus, the flickering of the image portion selected by the selection cursor and the image portion having the substantially same gradation as the image portion is one of a plurality of adjustment points corresponding to the input gradation level in the gradation characteristics of the image signal representing the still image. It is preferably performed by periodically increasing or decreasing the output grayscale value at the adjustment point of the input grayscale level closest to the grayscale value of the selected image portion.

According to this configuration, the flickering between the image portion selected by the selection cursor and the image portion having the same gradation as the image portion is selected from a plurality of adjustment points corresponding to the input gradation level in the gradation characteristics of the image signal representing the still image. Since it is performed by periodically increasing or decreasing the output gray level value at the adjustment point of the input gray level level closest to the gray level value of the image area, the selected image area and the approximate method are increased by a simple method of increasing or decreasing the output gray level value at one adjustment point. The same gradation site can be flickered.

Therefore, according to the image display device of the present invention, the selected image portion and the image portion selected together can be recognized and identified by a simple method.

In this image display apparatus, the image signal processing section includes a gamma correction section for correcting the intrinsic gradation characteristic in the display section to one of the basic gradation characteristics among a plurality of predetermined basic gradation characteristics in order to be suitable for human visual characteristics. And a gradation point adjustment unit for adjusting output gradation values for a plurality of adjustment points set according to the input gradation levels in the basic gradation characteristics. The gradation adjustment to the image signal by the image signal processing unit is performed by the gamma correction unit. It is preferably performed by the gradation characteristic which synthesize | combined the gradation adjustment in the gradation point adjustment part, and the flickering of the image part selected by the selection cursor and the image part which has substantially the same gradation as the image part is performed by the gradation point adjustment part. Do.

According to this configuration, the image signal processing section includes a gamma correction section for correcting the intrinsic gradation characteristic in the display section to one of the basic gradation characteristics among a plurality of predetermined basic gradation characteristics so as to be suitable for human visual characteristics. Since a gradation point adjustment section for adjusting output gradation values for a plurality of adjustment points set in accordance with the input level in gradation characteristics is provided, each function is performed as an independent dedicated component site. Therefore, since each structure can be diversified, it can be set as a simple structure.

In addition, since the image portion selected by the selection cursor and the image portion having the same gradation as the image portion are performed by the gradation point adjusting section, the image portion can be flickered without affecting the basic gradation characteristics.

Therefore, the image display device of the present invention can recognize and identify the selected image portion and the image portion selected together by a simple configuration.

In this image display device, it is preferable that the increase / decrease amount which periodically increases or decreases the output tone value at the adjustment point is ± 10% or less at full scale of the output tone value of the tone characteristic.

The output gradation level in a general image display device is 8 to 10 bits, which is a 256 to 1024 output gradation value. Here, when the screen portion is visually recognized by flickering the screen portion, if the gray scale "0" to the maximum value is periodically increased or decreased by the full scale of this output gray scale level, the contrast is too large and the image flickers and the eyes of the observer This becomes tired. In addition, the responsiveness of the display unit cannot be followed, resulting in an afterimage and an image with discomfort.

According to this configuration, since the increase / decrease amount that periodically increases or decreases the output tone value at the adjustment point is an increase or decrease amount of ± 10% or less with respect to the full scale of the output tone value at the gray scale characteristic, the observer's eye with appropriate contrast The burn site can be visually recognized without fatigue. In addition, the response of the display unit can also be sufficiently followed.

Therefore, according to the image display device of the present invention, the selected image portion can be clearly seen without discomfort.

In this image display device, it is preferable that the flickering period of the image portion selected by the selection cursor and the image portion having the same gray scale as the image portion is in the range of 0.5 to 3 ms.

In general, the visual characteristics of human beings are said to increase the degree of feeling of discomfort caused by flickering of images gradually when the flicker cycle exceeds 3 ms.

According to this configuration, since the flickering period of the image portion selected by the selection cursor and the image portion having approximately the same gradation as the image portion is within the range of 0.5 to 3 ms, the image display device does not give an unpleasant feeling due to flickering. The said image part can be visually recognized clearly.

Therefore, according to the image display device of the present invention, the selected image portion can be visually recognized without causing discomfort.

Further, in this image display device, the OSD unit superimposes a graph adjustment screen including a graph smaller than the image indicating the gray scale characteristic of the image on the image signal, and at the input gray level for adjusting the gray scale characteristic on the graph adjusting screen. It is preferable to make the dot display part corresponding to a selected image part flicker, or to change the hue of a dot display part among the some dot display parts which show the output gradation level for every adjustment point set accordingly.

According to this configuration, the OSD unit superimposes the graph adjustment screen on the image signal, and displays a plurality of dots indicating output gradation levels for a plurality of adjustment points set according to input gradation levels for adjusting gradation characteristics on the graph adjustment screen. Since the dot display portion corresponding to the selected image portion is flickered or the color tone of the dot display portion is changed in the display portion, the present gray scale characteristic can be visually recognized by the graph, and the part on the graph is clearly selected. I can figure it out.

Therefore, according to the image display apparatus which concerns on this invention, while the present gradation characteristic can be visually recognized by a graph, it can grasp | ascertain which part on the graph is selected clearly.

In the image display device, the OSD unit superimposes the characteristic confirmation screen, which is a graph smaller than the image indicating the gradation characteristics of the image, on the image signal, and a plurality of sets set in accordance with the input gradation level of the gradation characteristics on the characteristic confirmation screen. It is preferable to make the dot display part corresponding to a selected image part flicker, or to change the hue of a dot display part among the some dot display parts which show the output gradation level for every adjustment point.

According to this configuration, the OSD unit superimposes the characteristic confirmation screen, which is a graph smaller than the image indicating the gradation characteristics of the image, on the image signal, and the plurality of adjustment points set in accordance with the input gradation level of the gradation characteristics on the characteristic confirmation screen. Since the dot display portion corresponding to the selected image portion is flickered or the color tone of the dot display portion is changed among the plurality of dot display portions indicating the output gradation level, the graph can visually recognize the current gradation characteristics and on the graph You can clearly see which part you are selecting.

Therefore, according to the image display apparatus which concerns on this invention, while the present gradation characteristic can be visually recognized by a graph, it can grasp | ascertain which part on the graph is selected clearly.

In this image display device, the flickering period of the dot display portion of the graph adjustment screen or the characteristic confirmation screen is preferably synchronized with the flickering period of the image portion selected by the selection cursor.

According to this configuration, since the flickering period of the dot display portion of the graph adjustment screen or the characteristic confirmation screen is synchronized with the flickering period of the image portion selected by the selection cursor, the corresponding image portion and the corresponding image on the graph adjustment screen or the characteristic confirmation screen It can visually recognize that the dot display part of an adjustment point shows the same selection site | part. In addition, synchronizing the cycles does not cause visual discomfort.

Therefore, according to the image display apparatus according to the present invention, it is possible to visually know that the selected image portion and the dot display portion correspond.

In this image display device, a plurality of adjustment points are distributed with a half or more adjustment points of the total number of adjustment points in a range from low gray level to intermediate gray level at the input gray level. It is desirable to have.

Human vision is sensitive to dark colors. In addition, the adjustment of the high gradation range in the gradation characteristics can also be adjusted by the "brightness" adjustment, which is a gain adjustment provided in the general image display apparatus.

According to this configuration, since a plurality of adjustment points are allocated from the low tone range on the input side to many adjustment points in the range of the intermediate tone range, the image display device is required for the "quality structure" that the user most expects for the tone adjustment. There are many adjustment points in the area.

Therefore, according to the image display device of the present invention, it is possible to adjust the image according to the preference of the user.

In this image display apparatus, the graph adjustment screen includes a plus button and a minus button for increasing or decreasing the gradation value by one step, with a predetermined output gradation amount determined for each selected adjustment point as one step, and the predetermined output. The gradation amount is preferably set so that the adjustment point of the low gradation region is larger than the adjustment point of the high gradation region.

In general, the image adjustment by gradation adjustment is performed in such a way that the frequency of adjustment of the high gradation region is low, the adjustment amount is small, the frequency of the low gradation region is higher, and the adjustment is large.

According to this configuration, since the predetermined output gradation amount is set so that the adjustment point of the low gradation region is larger than the adjustment point of the high gradation region, the adjustment amount per step of the graph adjustment screen is adjusted to meet the use demand. It is set.

Therefore, the image display device of the present invention is convenient to use.

In this image display apparatus, when an operation for determining the selected adjustment point of the property confirmation screen is performed by the operation unit, the OSD unit stops overlapping of the property confirmation screen and adjusts the gradation for adjusting the output gradation level of the selected adjustment point. The screen is superimposed on the image signal, and the gradation adjustment screen includes a plus button and a minus button for increasing or decreasing the gradation value by one step with a predetermined output gradation amount determined for each selected adjustment point as one step. The output gradation amount is preferably set so that the adjustment point of the low gradation region is larger than the adjustment point of the high gradation region.

According to this configuration, since the predetermined output gradation amount is set so that the adjustment point of the low gradation range is larger than the adjustment point of the high gradation range, the adjustment amount per one step of the gradation adjustment screen is adjusted to meet the use demand. It is set.

Therefore, the image display device of the present invention is convenient to use.

In order to achieve the above object, the image adjusting method of the image display apparatus of the present invention includes a display unit for displaying an image represented by an image signal, and a memory for storing a plurality of gray scale characteristics used for adjustment of the gray scale characteristics in the image signal. And an OSD unit for superimposing a selection screen smaller than an image for selecting one of the plurality of gradation characteristics in the image signal, an operation for selecting any gradation characteristic from at least the selection screen, and an operation for determining the selection content. An image display method comprising an operation unit which comprises this operation and an image signal processing unit that performs image processing including adjustment of gray scale characteristics in an image signal, wherein an operation of selecting a gray scale characteristic from a selection screen is performed. A step of adjusting the gradation characteristic of the signal by the selected gradation characteristic, and the image scene to which the adjustment An image according to characterized in that it comprises a step of displaying on the display unit.

According to this image adjustment method, when an operation for selecting a gradation characteristic from a selection screen is performed, a step of adjusting the gradation characteristic of the image signal by the selected gradation characteristic and displaying an image by the adjusted image signal on the display unit Since a process is included, the image which included the adjustment content in the background of the selection screen at the selection step of the adjustment content can be confirmed.

Therefore, according to the image adjustment method of the image display apparatus of this invention, in the selection step of adjustment content, the image containing the adjustment content can be confirmed.

The image adjustment method of the image display device of the present invention includes a display portion for displaying an image represented by an image signal, a selection cursor for selecting a desired image portion on the image, and input and output gradation of gradation characteristics in the initial setting of the image. An OSD section for superimposing a characteristic confirmation screen including a graph indicating a correlation between levels and a gradation adjustment screen for adjusting gradations for each of a plurality of adjustment points in the gradation characteristics of the image on the image signal, and at least the gradation characteristics of the image. An image display having an operation unit for starting the adjustment and an operation for selecting an image portion by the selection cursor and an operation for determining the selected image portion, and an image signal processing portion for performing image adjustment including adjustment of the gradation characteristics in the image signal As an image adjustment method of the apparatus, if an operation for performing image adjustment is made, Stops the display, displays the selection cursor on the display unit, and the operation of selecting the image portion by the selection cursor causes the adjustment point corresponding to the gray level of the selected image portion to flash or to adjust the color tone of the adjustment point. Superimposing the changed characteristic check screen on the image signal, and superimposing the gray scale adjustment screen of the adjustment point corresponding to the gray level of the selected image portion on the image signal when an operation of determining the selected image portion is performed. It is done.

According to this image adjustment method, if an operation to perform image adjustment is performed, the step includes stopping the image and displaying a selection cursor on the display unit. Therefore, if the image is a moving image, the image is changed. It is difficult, but selection is easy by freezing an image. In addition, a desired image portion among still images can be selected by the selection cursor.

Since the operation of selecting the image portion by the selection cursor is performed, the step of flashing the adjustment point corresponding to the gradation of the selected image portion or superimposing the characteristic confirmation screen on which the hue of the adjustment point is changed is superimposed on the image signal. The position of the image part in the gradation characteristic of the whole image is specified in the graph. Therefore, the adjustment point in the gradation characteristic of the whole image can be confirmed by a graph before performing gradation adjustment.

In addition, when the operation for determining the selected image part is performed, the step of superimposing the gradation adjustment screen of the adjustment point corresponding to the gradation of the selected image part on the image signal is included. Adjustment can be made.

Therefore, according to the image adjustment method of the image display apparatus of this invention, a desired adjustment part can be selected from a display image, and the image of the selected adjustment part can be adjusted after confirming the gradation characteristic of the whole image.

The image adjusting method of the image display device of the present invention includes a display portion for displaying an image represented by an image signal, an OSD portion for superimposing a selection cursor for selecting a desired image portion on the image, and at least an image gray level. If an operation for starting the adjustment of the characteristic and an operation for selecting the image portion by the selection cursor is performed, and the image adjustment including the adjustment of the gray scale characteristic to the image signal is performed, and the operation for performing the image adjustment on the operation unit is performed, the image An image adjusting method of an image display device including an image signal processing unit for displaying a selection cursor by the OSD unit, and stopping the operation, comprising: a step of accepting an operation of selecting an image portion from a still image by the selection cursor; An image having approximately the same gradation as the selected image portion and the selected image portion in the image In that it comprises the step of blinking the above features.

According to this image adjusting method, a process of accepting an operation of selecting an image portion from a still image by a selection cursor, and a step of flickering a selected image portion in the still image and an image portion having a gray scale substantially equal to the selected image portion Since it is included, the selected image portion including approximately the same gradation portion is displayed separately from other image portions by flashing. Therefore, the selected image part can be visually recognized clearly. In addition, even if the unexpected part is selected by this, it can identify at a glance.

Therefore, according to the image adjustment method of the image display apparatus of this invention, a desired image adjustment part can be selected from a display image, and the selected image part can be visually recognized clearly.

In addition, when the image adjusting method of the image display apparatus is constructed by using a computer provided in the image display apparatus, the present invention provides a program for realizing the function or a record in which the program is readablely recorded by the computer. It is also possible to comprise in the form of a medium or the like. Examples of recording media include flexible disks, CD-ROMs, magneto-optical disks, IC cards, ROM cartridges, printed materials on which codes such as punch cards and bar codes are printed, and internal storage devices (image memory devices such as RAM and ROM). And a variety of computer-readable media such as an external storage device.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail based on an accompanying drawing.

(Embodiment 1)

<< outline of the projector >>

Fig. 1 is a diagram showing a work use aspect of the projector in Embodiment 1 of the present invention. The projector 100 as an image display device projects an image based on an image signal supplied from an image signal supply device 200 such as a personal computer on the screen SC.

The projector 100 has two image adjustment functions in order to enhance the expressive power of the image according to the contents of the image or the projection environment. The projector 100 can adjust the gradation value included in the image signal supplied from the image signal supply device 200. have. One of the image adjustment functions included in the projector 100 is a "gamma" adjustment for selecting a reference gamma characteristic, which is a basic gray scale characteristic, from among a plurality of options stored in advance, and the other is to accent the characteristic to the reference gamma characteristic. To do this, use the “Color Mode” adjustment to select the desired color mode from among multiple options such as “Natural”, “Dynamic” and “Theater”.

Among the reference gamma characteristics that can be selected when the gamma adjustment is performed, the "custom" characteristic is included. When the "custom" characteristic is selected, the gray scale characteristic, that is, the output gray scale value for the input gray scale value, is converted into a plurality of specific input gray scale values ( The mode can be customized for each of the following). That is, in this "custom" characteristic, it is possible to customize the reference γ characteristic itself, that is, the gradation characteristic itself which is a correlation between the input gradation value and the output gradation value.

The projector 100 has a function of selecting a desired image portion from the projected image to designate an adjustment point to be customized, and can adjust the output gray value of the adjustment point corresponding to the gray value of the selected image portion.

For example, in the case of Fig. 1, the image portion at the lower left of the projection image projected on the screen SC is selected by the selection cursor 51 for selecting the image portion. When an operation for determining the selected image portion in this state is performed, the projector 100 can adjust the output gradation value of the image portion having approximately the same gradation as the selected image portion.

In addition, in the "gamma" adjustment function, in addition to the "cursor adjustment mode" where the adjustment is started by selecting the desired image portion by the selection cursor 51 described above, a graph showing the gradation characteristics over the entire gradation range is displayed. There is also a "graph adjustment mode" in which a gradation adjustment is performed by selecting an adjustment point to be adjusted from a plurality of adjustment points included in the graph. In the "Graph Adjustment Mode", the output gradation value corresponding to the selected adjustment point can be adjusted.

The operation of the projector 100 including the selection and adjustment operations of these functions and adjustment modes is performed by the operation unit 1 or the remote control unit 2 provided on the projector 100 placed on the desk.

The projector 100 is not limited to being installed on a desk. For example, the projector 100 may be installed on the ceiling and operated by the remote controller 2.

<< composition of the projector >>

2 is a schematic configuration diagram of a projector of the present invention. Here, a schematic configuration of the projector 100 for realizing an image adjustment function such as "gamma" adjustment will be described with reference to FIG.

The projector 100 separates the light emitted by the lamp 3 as the light source unit into three primary color components of red light, blue light, and green light, and the liquid crystal light valves 5R, 5G, and 5B for each color light as the display unit for each color light. It is a so-called "liquid crystal 3 panel type projector" which modulates according to an image signal, and expands and projects the synthesized full color modulated light on the screen SC by the projection lens 7 again. The liquid crystal light valves 5R, 5G, and 5B are optical modulators, which are provided for red light, green light, and blue light, respectively, and are included in the configuration of the optical portion 4.

The projector 100 includes an operation unit 1, a remote control unit 2, a lamp 3, an optical unit 4, a projection lens 7, a control unit 10, an operation receiving unit 11, a power supply unit 12, and a lamp driving unit. (13), the storage unit 14, the AD converter 15, the image signal processing unit 16, the image signal correction unit 25, the liquid crystal panel driver 26, and the like.

The operation unit 1 is provided with a plurality of operation buttons for operating the projector 100. The plurality of operation buttons include a "power button" for starting up and shutting down the projector 100, a "Menu button" for displaying various operation menus (operation screens), and a "Select button" for determining selected contents. Includes “Esc button” to return to the previous operation screen, “↑ button”, “↓ button”, “→ button”, “← button” to select the option or to increase / decrease by one step of gradation It is. In addition, "↑ button" and "↓ button" are described as a set "up and down button", "→ button", and "← button" as a "left and right button". These "up and down buttons" and "left and right buttons" function as plus buttons and minus buttons, respectively, depending on the form of the operation screen.

The remote controller 2 is a remote controller for remotely controlling the projector 100, and is provided with a "γ adjustment button" for instructing "gamma" adjustment in addition to a plurality of operation buttons identical to the operation unit 1.

The lamp 3 is, for example, a discharge lamp that obtains high brightness such as a high pressure mercury lamp, a metal halide lamp, and a halogen lamp.

The optical unit 4 separates the integrator optical system that converts the light emitted by the lamp 3 into the light having stable luminance distribution, and the light having the stable luminance distribution into each of the three primary colors of the light, red, green, and blue color components. Separated optical system for supplying to the liquid crystal light valves 5R, 5G, and 5B for each color light, and a synthetic optical system for recombining each color light modulated according to an image signal for each color light by the liquid crystal light valve (neither shown) Not included).

The projection lens 7 projects the full color image on the screen SC by enlarging the full color modulated light emitted from the optical unit 4.

The control unit 10 is a central processing unit (CPU), and exchanges signals with each unit through a bus line bus.

The operation reception unit 11 accepts the operation when the operation is performed by the operation unit 1 or the remote controller 2, and sends an operation signal that triggers various operations to the control unit 10.

The power supply unit 12 delivers AC power from the external power supply 210 from the plug, and stabilizes the DC by stabilizing by performing transformation, rectification, smoothing, and the like to a built-in AC / DC conversion unit (not shown). The voltage is supplied to each part of the projector 100.

The lamp driver 13 receives an electric power supply from the power supply unit 12, maintains an ignitor circuit that generates a high voltage to form a discharge path to turn on the lamp 3, and maintains a stable lighting state after lighting. And ballast circuits (not shown in the figures).

The storage unit 14 is composed of a nonvolatile memory capable of rewriting data such as, for example, a flash memory and a ferroelectric random access memory (FeRAM). The storage unit 14 operates operations of the projector 100, such as a startup program that defines the procedure and contents for starting the projector 100, and a "gradation characteristic adjustment program" for correcting the gradation value of an image signal to a preference. Various programs for controlling and accompanying data are stored. As the accompanying data, a plurality of gamma correction data corresponding to VT characteristics indicating the correlation between the input voltage level and the light transmittance measured for each of the liquid crystal light valves 5R, 5G, and 5B in the manufacturing step of the projector 100 are stored. have.

The AD converter 15 is an AD converter and is configured to include a decoder (not shown). The AD converter 15 adjusts the analog image signal Vin of various formats supplied from the image signal supply device 200 by a decoder as needed, and then A / D based on the sampling clock SCLK. The converted digital RGB signal is output as the image signal Din. The sampling clock SCLK is generated in a phase locked loop (PLL) circuit (not shown) in the image signal processing unit 16 based on the synchronization signal SYNC included in the image signal Vin, and the AD converter 15 Is supplied. A / D conversion of this image signal is performed to perform various image signal processing on the image signal Vin.

The image signal processing unit 16 is an image processor having a scaler function or the like, and generates a digital image signal Dcs by performing various image processing including scaling and adjustment of a gray scale value to the image signal Din. do. The frame signal 17 and the OSD memory 18 are attached to the image signal processor 16.

The frame memory 17 is constituted of, for example, a DRAM (Dynamic Random Access Memory), and is three memory planes for storing image data based on an image signal for each of the red, green, and blue color lights.

The OSD memory 18 is an image memory and stores OSD image data indicating OSD images such as various operation screens and selection cursors that are superimposed and displayed on the projected image.

The image signal processing unit 16 is composed of a scaler unit 19, an OSD unit 20, a gradation point adjustment unit 21, a gamma correction unit 22, a CPU unit 23, and the like.

The scaler 19 writes image data based on the image signal Din into the frame memory 17 for each of the RGB color signals at the resolution of the image signal, and can be displayed by the liquid crystal light valves 5R, 5G, and 5B. A scaling process is performed to generate an image signal conforming to the resolution of the display unit by converting the resolution into a resolution. In addition, a trapezoidal correction process for making the shape of the effective image projected on the screen SC close to a rectangle is also performed along with the scaling process.

The OSD unit 20 performs OSD (On Screen Display) processing to superimpose an OSD image such as an operation screen on the projection image. The OSD processing is performed at a stage in which image data for each color light of RGB is written into the frame memory 17, and the OSD unit 20 reads OSD image data indicating an operation screen or the like from the OSD memory 18, and reads it. The OSD image data is superimposed on the frame memory 17.

The gradation point adjustment unit 21 and the gamma correction unit 22 are one-dimensional look-up tables (hereinafter referred to as "LUTs") installed in the RAM area of the firmware and are included in the image signal Din. Adjust the gradation value. In addition, a "RGB-YUV converter" converts an RGB signal into a YUV signal at the front of the gradation point adjusting unit 21, and a "YUV-RGB converting unit for converting a YUV signal into an RGB signal at the rear of the gamma correction unit 22. (Both not shown) is provided, and the adjustment by the gradation point adjusting unit 21 and the gamma correcting unit 22 is performed using the Y signal of the YUV signal.

The CPU unit 23 is a CPU in charge of the control of the image signal processing unit 16 as an image processor, and controls the series of image processing by using the frame memory 17 and the OSD memory 18. In addition, the CPU unit 23 functions as the overall control of the function of the control unit 10, for example, the start of the projector 100, projection of an image, shutdown, and the like, thereby controlling the configuration of the projector 100. ) May be omitted.

The image signal correction unit 25 is a three-dimensional LUT, and in the color reproduction region (gamut) that can be expressed by the liquid crystal light valves 5R, 5G, and 5B in the image signal Dcs input from the image signal processing unit 16. The digital image signal is subjected to color matching processing for properly displaying the image by the image signal, and color spot correction processing for correcting color spots inherent in the liquid crystal light valves 5R, 5G, and 5B. In addition, the image signal correction unit 25 incorporates a DA converter (not shown), and DA-converts the digital image signal by the DA converter to generate an analog image signal Vout.

The liquid crystal panel driver 26 supplies an image signal Vout, a driving voltage, and the like input from the image signal corrector 25 to the liquid crystal light valves 5R, 5G, and 5B, and supplies liquid crystal light valves 5R, 5G, The image is projected onto 5B).

《Adjusting and Correcting Image Signals》

Fig. 3A is a graph showing an example of input / output characteristics in the LUT of the gradation point adjustment section 21. Figs. Fig. 4A is a graph showing an example of VT characteristics of the liquid crystal light valve, and Fig. 4B is a graph showing an example of input / output characteristics in the LUT of the gamma correction unit 22. Figs.

Here, the contents of the adjustment of the image signal by the gradation point adjustment unit 21 and the gamma correction unit 22, which are features of the present invention, are shown in Figs. 2, 3 (a), 4 (a) and 4 ( Explain using b).

In the projector 100, the adjustment of the image signal is performed in two stages: the adjustment by the gradation point adjustment unit 21 as the first step and the adjustment by the gamma correction unit 22 as the second step. Therefore, the adjustment which synthesize | combined the adjustment content in each said step is performed for the image signal Dcs output from the image signal processing part 16. FIG.

The first step is gradation adjustment for each adjustment point by the gradation point adjustment section 21. The gradation point adjustment section 21 is in charge of adjusting the "custom mode" characteristic in the "color mode" adjustment and the "gamma" adjustment.

On the X-axis of the graph of Fig. 3A, there are a plurality of adjustment points &quot; gradations 1 to 9 &quot; corresponding to specific input gray scale values. In addition, there are dot display sections D1 to D9 that show output gradation values at each adjustment point for each adjustment point "gradations 1 to 9". In addition, the larger the value, the brighter the image.

Here, the LUT of the gradation point adjustment unit 21 having the input / output characteristics of the graph of Fig. 3A outputs an output gradation value of 10 bits corresponding to 1 to 1 with respect to the input gradation value of 10 bits. The conversion characteristics in the initial setting of the LUT are set as "y = x" when the input gray scale value of the X axis is "x" and the output gray scale value of the Y axis is "y". This corresponds to the γ value of 1. 0, which is “natural” when we say the color mode in the “color mode” adjustment.

"Gradation correction data" that defines the output gradation value of each adjustment point "Gradation 1-9" is stored in the storage unit 14 for each color mode, and the "Gradation correction data" of the selected color mode is stored in the gradation point adjustment unit 21. ) Is set in the LUT.

In addition, in the "custom" characteristic of the "gamma" adjustment, the output gradation value for every adjustment point "gradation 1-9" can be changed into a desired value, and the customized "gradation correction data" is carried out in the gradation point adjustment part 21 ) Is set in the LUT.

In addition, the adjustment of the "custom" characteristic is performed in the gradation point adjustment unit 21, and the adjustment operation is performed not from the operation screen on which the color mode selection operation is performed, but from the operation screen of the "gamma" adjustment.

The second step is an adjustment for correcting the gradation characteristic inherent to the liquid crystal light valves 5R, 5G, and 5B by the gamma correction unit 22. In addition, in the following description, adjustment of the image signal by the gradation point adjustment part 21 is performed for "adjusting the gradation point", and the adjustment for correcting the gradation characteristic inherent to each liquid crystal light valve by the gamma correction part 22. It describes as "(gamma) correction".

In the graph of Fig. 4A, the horizontal axis represents the applied voltage to the liquid crystal light valve in 8 bits, and the vertical axis represents the light transmittance. As shown in Fig. 4A, the liquid crystal light valves 5R, 5G, and 5B each have intrinsic gradation characteristics (also referred to as "voltage vs. transmittance characteristics" or "VT characteristics").

The gamma correction unit 22 corrects by the LUT so that the gradation characteristic inherent to the liquid crystal light valves 5R, 5G, and 5B becomes the input / output characteristic indicated by the reference γ characteristic in the graph of Fig. 4A. For this reason, in the LUT provided for each of the liquid crystal light valves 5R, 5G, and 5B of the gamma correction unit 22, the gray level characteristic inherent to the liquid crystal light valves 5R, 5G, and 5B as shown in FIG. "Γ correction data" having input and output characteristics for converting the characteristic (e.g., gamma value 2. 2) is set.

The projector 100 has five options of gamma values 2. 0 to 2. 4 (0.1 units) as reference gamma characteristics. The gamma correction data corresponding to these reference gamma characteristics is set in advance in the manufacturing step of the projector 100 after measuring the gray scale characteristics for each of the liquid crystal light valves 5R, 5G, and 5B, and is stored in the storage unit 14. I remember.

As described above, the adjustment of the image signal in the projector 100 is performed by adjusting the gradation point adjustment by the gradation point adjustment unit 21 as the first stage and the γ correction by the gamma correction unit 22 as the second stage. Since a step is performed, the image signal Dcs output from the image signal processing unit 16 has a gradation value obtained by combining the adjustments made in each step. When this is explained graphically, the reference γ characteristic by "γ correction" in Fig. 4A and the gradation characteristic by "Gradation point correction" in Fig. 3A are shown as the combined gradation characteristics.

In addition, the adjustment of the image signal may be performed in the order of adjusting by the gamma correction unit 22 first, and then adjusting by the gradation point adjusting unit 21.

Accordingly, for example, the "natural" or "dynamic" or "theater" mode in the reference? Characteristic "? Value 2. 0", or the respective color modes in the? Various adjustments can be realized by various combinations.

Here, the "gradation point adjustment" by the gradation point adjustment section 21 of the first step will be described in more detail.

The adjustment points in the graph of Fig. 3A are nine points (gradations 1 to 9), and up to 6 points are set to 511 or less gray scale values.

In addition, since one point (gradation 7) of the remaining three points is 512 gradation values which are approximately intermediate gradation values, about 78% of adjustment points are in the gradation region from the low gradation region in the input gradation. This is due to the provision of more adjustment points in the gradation region with a higher frequency of adjustment calculated from the empirical rule.

To adjust the output gradation value by selecting an adjustment point from among these multiple adjustment points, select the "Custom" characteristic from the "Gamma" adjustment options, and adjust it by "Cursor adjustment mode" or "Graph adjustment mode". Specify the image area or adjustment point you want.

For example, in the "cursor adjustment mode", when the selection cursor 51 selects and determines the lower left image part of the image projected on the screen SC of Fig. 1, the gray scale value of the selected image part is determined. The adjustment point (e.g., gradation 4) in the closest graph of Fig. 3A is selected.

The adjustment of the output gradation value at the selected adjustment point is performed by the "up and down buttons" or "left and right buttons" which function as plus and minus buttons on the operation unit 1 or the remote control 2. For example, in the gradation adjustment screen G4 of FIG. 9B, the “left and right buttons” function as the plus and minus buttons in the graph adjustment screen G12 of FIG. 17 (a). .

In addition, the gradation amount per step by one increment and decrement operation using the plus and minus buttons is, for example, when the plus button is operated once at the adjustment point "Gradation 4", the output gradation value is a predetermined gradation amount. "4 counts" increases by one step. Similarly, when the minus button is operated once, the output gradation value decreases by "4 counts" for 1 step. In addition, when the plus and minus buttons are continuously pressed, they are continuously increased or decreased by one step amount in accordance with the pressed time.

In this way, the adjustment gradation amount as a predetermined gradation amount per step by one increase and decrease operation at each adjustment point is predetermined.

Fig. 3B is a table showing the gradation amount per step for each adjustment point in the graph of Fig. 3A.

As shown in Fig. 3 (b), the amount of gradation for each adjustment point is one step "two counts" at the adjustment points "Gradation 8 and 9" of the high gradation range, and at the adjustment points of the other low gradation to relay gradation regions. In one step, "4 counts", the adjustment amount at the adjustment points of the low gradation range and the intermediate gradation range is set to be larger than that of the high gradation range.

This is determined by the rule of thumb that the amount of adjustment of the gradation value in the high gradation range is small compared with the low gradation range and the intermediate gradation range.

<< the details of selection cursor >>

Fig. 5A is an enlarged view of the selection cursor in one aspect. Fig. 5B is a diagram showing one aspect of the selection state of the image portion by the selection cursor.

Here, the details of the selection cursor 51 used in the "cursor adjustment mode" will be described. Fig. 5A is an enlarged view of the selection cursor 51 in Fig. 1 which selects the lower left image portion in the projected image of the screen SC.

The selection cursor 51 is composed of a pixel selecting portion 52 and an annular portion 53.

The pixel selector 52 represents a selection range for selecting a desired image portion in the image, and selects a pixel contained within the selection range from the effective display pixels of the liquid crystal light valves 5R, 5G, and 5B as the display portion. In the case of the pixel selection part 52, nine pixels of the pixels p1-9 which consist of three vertically and laterally angular pixels become a selection range. The number of pixels is not limited to nine pixels, but may be three or more consecutive pixels.

The annular portion 53 is formed so as to surround the pixel selector 52 and is always set to have the same color tone as the pixel selector 52. The annular portion 53 always moves together with the pixel selection portion 52, and the positional relationship between the two is always kept constant.

Since the annular portion 53 surrounds the circumference of the pixel selection portion 52 in this manner, the position of the selection cursor 51 in the image of the screen SC in FIG. Even small size is clearly seen.

The selection cursor 51 is superimposed by the OSD unit 20 in the stage in which the image data for each RGB signal is written into the frame memory 17 in the scaling process by the scaler unit 19. The position of the selection cursor 51 is grasped by the CPU unit 23 in the address on the frame memory 17 by the movement amount according to the operation of the "up and down buttons" and "left and right buttons" from the address of the initial setting. In addition, the position in the initial setting of the selection cursor 51 becomes the substantially center part of an image.

The gray level value of the pixel selected by the selection cursor 51 is calculated as luminance signal data (Y signal data) by calculating the image data of the selected pixel in the frame memory 17 in which the image data for each RGB signal is written. Become. Specifically, “Y = 0. 299R + 0. 587G + 0. Luminance signal data is obtained by an operation such as "144B".

The projector 100 recognizes the average value of the gradation values excluding the maximum and minimum gradation values in the gradation values (Y signals) of the nine pixels thus obtained as the gradation values of the selected image portion. This is because heterogeneous pixel components due to noise or the like in the image are excluded. It may also be an average of the gradation values of all selected pixels and recognized as a gradation value of the selected image portion.

Fig. 5B shows the shape of the selection cursor when the edge of the image V is selected by the selection cursor. In addition, when the position of the selection cursor 51 reaches the edge of the image V, the CPU unit 23 controls so that the entirety of the pixel selection unit 52 does not deviate from the image V. FIG. Here, it is assumed that the image V is an image having a bright gray value close to all whites.

The selection cursors 51i and 51j select an image portion in the lower left periphery of the image V. FIG. Incidentally, for the sake of explanation, the selection cursors 51i and 51j are listed and displayed on the same screen, but only one of them is actually displayed.

The pixel selection unit 52 of the selection cursor 51i selects the nine pixels of the shortest part in the lower left of the image V. FIG. In this case, only the part within the range of the image V of the annular part 53 is displayed.

Similarly, in the case of the selection cursor 51j that selects the lower left pixel of the image V, the annular portion 53 displays only a portion within the range of the image V. FIG.

In this way, even when the edge portion of the image V is selected by the selection cursor, the shape of the annular portion 53 within the range of the image V is displayed, so that the selection cursor can be clearly confirmed.

Further, the selection cursors 51i and 51j displayed on the bright image V close to all white are all black hue. On the other hand, in the image of the screen SC of Fig. 1, the selection cursor 51 is white.

In this manner, the color tone of the selection cursor is either color tone of white or black, and is controlled by the CPU unit 23 so that the contrast of the selected image part becomes the color tone of the larger one according to the gradation of the selected image part.

<< flow-1 of the first image adjustment process >>

Fig. 6 is a flowchart for explaining the operation of the projector 100 when performing the “gamma” adjustment. Fig. 7A is a diagram showing one aspect of the selection screen, and Fig. 7B is a diagram showing one aspect of the branch screen.

Here, the operation in the first aspect at the time of performing the "gamma" adjustment will be described with reference to Figs. 6 (a), 7 (b) and 2 as appropriate with reference to Fig. 6.

The projector 100 is installed in an environment as shown in FIG. 1 and is operated by the remote controller 2.

In step S1, the control unit 10 checks whether there is an operation for performing "gamma" adjustment by the operation signal from the operation accepting unit 11. If there is an operation to perform "gamma" adjustment, the flow proceeds to step S2. If there is no operation, it continues to wait for operation. By this operation, the &quot; gradation adjustment program &quot; of the storage unit 14 is started, and the following processing is performed in accordance with the order and content of the gradation adjustment specified in the program.

In step S2, the control unit 10 causes the image signal processing unit 16 to superimpose the selection screen G1 shown in Fig. 7A on the image signal.

On the selection screen G1, five gamma values of 2. 0 to 2. 4, "custom" indicating a custom characteristic, and seven choices of reset are displayed as options for gray scale characteristics. Also, on the right side of the choice, a graph showing the selected gradation characteristics is displayed. The selection screen G1 shows a state in which "custom" is selected, and the graph on the right side of the screen shows its gradation characteristics.

The graph of the selection screen G1 shows the gradation characteristics obtained by combining the γ correction and the adjustment characteristics by the gradation point adjustment, and this straight line indicates the reference γ characteristic “γ value 2. 2”. . This is because the reference gamma characteristic at the initial setting of the projector 100 is "gamma value 2. 2", so that the setting of the scale axis indicated as a straight line when the graph is "gamma value 2. 2" is performed. This is because the reference γ characteristic of the initial setting is also set to “γ value 2. 2”.

In addition, the graph in the various operation screens used for the following description also sets the same scale axis | shaft.

Further, below the selection screen G1, corresponding operation button names of the operation unit 1 or the remote controller 2 for operating the selection screen G1 are shown. Specifically, the "Esc button" to return the operation step 1, the "up and down button" to select the gradation characteristics, the "Select button" to confirm the selection of the selected gradation characteristics, and the "Menu" to terminate the adjustment Button ”is displayed. In addition, such an operation guide display on the other operation screen described later has the same meaning.

In addition, in the following description, when a new operation screen is displayed, the operation screen displayed until then is closed, and when no operation is performed for a predetermined time, for example, two minutes after the operation screen is displayed. It is assumed that the operation screen is closed to complete the adjustment.

In step S3, the control unit 10 checks whether there is an operation of selecting one of the characteristics from the selection of the gradation characteristics of the selection screen G1 by the operation signal from the operation accepting unit 11. If there is a selection operation, the flow proceeds to step S4. If there is no selection operation, the operation continues waiting.

In step S4, the control unit 10 sets gamma correction data of the selected gradation characteristic to the LUT of the gamma correction unit 22, and projects the image adjusted by the gradation characteristic. In this step, the projection image on the back of the selection screen G1 is an image adjusted by the selected gray scale characteristic.

In step S5, the control part 10 confirms whether the determination operation for confirming the selected gradation characteristic was performed by the operation signal from the operation accepting part 11. If there is a determination operation, the flow proceeds to step S6. If there is no determination operation, the flow returns to step S3 to accept the selection operation until the determination operation is made.

In step S6, the controller 10 checks whether the determined gray scale characteristic is a “custom” characteristic. If it is a "custom" characteristic, the flow advances to step S7. If it is not the "custom" characteristic, it progresses to step S10. In the case of the &quot; custom &quot; characteristic, the process proceeds to a process for changing the correlation between the gray scale characteristic, that is, the input gray scale value and the output gray scale value. It corresponds to the start operation for initiating a change.

In step S7, the control unit 10 superimposes the branch screen G2 shown in Fig. 7B by the image signal processing unit 16 on the image signal.

The branch screen G2 displays options for selecting either the "cursor adjustment mode" indicated by "adjust from image" and the "graph adjustment mode" indicated by "adjust from graph". The branch screen G2 shows a state where the "cursor adjustment mode" is selected.

In step S8, the control unit 10 checks whether there has been an operation of selecting and determining the "cursor adjustment mode" by the operation signal from the operation accepting unit 11. If there is a selection decision operation, the process proceeds to the subroutine of the "cursor adjustment mode". If there is no selection decision operation, the flow proceeds to step S9.

 In step S9, the control unit 10 checks whether there is an operation of selecting and determining the "graph adjustment mode" by the operation signal from the operation accepting unit 11. If there is a selection decision operation, proceed to the subroutine of the "graph adjustment mode". If there is no selection decision operation, the flow returns to step S7 to wait for the selection and decision operation.

Subsequently, the case where it is not the "custom" characteristic in step S6 is demonstrated.

In step S10, the control unit 10 causes the image signal processing unit 16 to close the selection screen G1 with the gamma correction unit 22 setting gamma correction data of the gradation characteristics selected and selected by &quot; Gamma ”adjustment is completed.

The selection record in which the selection of the "cursor adjustment mode" or "graph adjustment mode" is selected is stored in the storage unit 14, and the branch screen in the state where the adjustment mode stored in the step S7 is selected at the next operation. Is displayed.

In addition, when the gradation characteristic selected in step S6 was the "custom" characteristic, it is not limited to displaying the branch screen G2, for example, any adjustment mode of the direct graph adjustment mode or the cursor adjustment mode. The processing routine to enter may be sufficient.

<< Flow-2 of 1st image adjustment process: Cursor adjustment mode >>

Fig. 8 is a flowchart for explaining the operation when customizing the gradation characteristic by the cursor adjustment mode. Fig. 9 (a) is a diagram showing one aspect of the characteristic confirmation screen, and Fig. 9 (b) is a diagram showing one aspect of the gradation adjustment screen. Fig. 10A shows one aspect of the property confirmation screen, and Fig. 10B shows one aspect of the confirmation screen.

Here, the operations when customizing the gradation characteristics by the cursor adjustment mode will be described with reference to Figs. 8 (a), 9 (b), 10 (a), 10 (b), and Fig. 8 as appropriate. It demonstrates using 2.

In step S21, the control unit 10 stops the image by the image signal processing unit 16. This is because it is difficult to select an image part in the state of a moving image.

In step S22, the control unit 10 superimposes the "selection cursor" on the image signal by the image signal processing unit 16. This state is the same as, for example, the selection cursor 51 on the image on the screen SC of FIG.

In step S23, the control unit 10 checks whether there is an image selection operation for selecting a predetermined image portion by the "selection cursor" by the operation signal from the operation accepting unit 11. If there is an image selection operation, the flow proceeds to step S24. If there is no image selection operation, the image selection operation is awaited.

In step S24, the control unit 10 causes the image signal processing unit 16 to flicker the selected image portion and the image portion having a gradation substantially equal to the gradation of the image portion, and confirm the characteristics of Fig. 9A. The screen G3 is superimposed on the image signal.

In this process, first, the control unit 10 reads image data for each color of RGB in the image portion selected by the "selection cursor" from the frame memory 17, and generates luminance signal data (Y) from the image data of each pixel. Signal data). Next, the average value of the Y signal data except the maximum and minimum gray scale values of the Y signal data of each pixel is obtained. Then, the adjustment point nearest to the obtained Y signal data is selected as the adjustment point to be adjusted.

In addition, the flickering of the image part is performed by outputting the output gray level value of the selected adjustment point in the "gradation correction data" of the gray level adjustment unit 21 (LUT) to an initial output gray level value plus 32 counts and negative 32 counts. It is performed by switching every time.

Moreover, the characteristic confirmation screen G3 has shown the state in which the adjustment point "gradation 2" was selected, and the dot display part D2 of the adjustment point "gradation 2" flashes in synchronization with the flicker cycle of an image part. In addition, the display method of a dot display part is not limited to flashing, For example, the hue of a dot display part may be changed into the hue different from the hue of another dot display part, such as orange.

In step S25, the control unit 10 checks whether there is an image determination operation for determining the selected image part, that is, the selected adjustment point, by the operation signal from the operation accepting unit 11. If there is an image determination operation, the flow proceeds to step S26. If there is no image determination operation, the image determination operation is awaited.

In step S26, the control unit 10 stops the flicker of the image portion by the image signal processing unit 16 and superimposes the gradation adjustment screen G4 shown in Fig. 9B on the image signal. In addition, the process routine which displays the gradation adjustment screen G4 instead of the characteristic confirmation screen G3 in step S24 may be sufficient. In this flow, confirmation of the image determination operation in step S25 is unnecessary, and the flickering of the image portion is stopped by triggering the adjustment operation on the gradation adjustment screen G4.

In step S27, the control unit 10 checks whether there is an operation for adjusting the output gradation value by the operation signal from the operation accepting unit 11. If there is adjustment operation, the flow proceeds to step S28. If there is no adjustment operation, wait for the adjustment operation.

In step S28, the control unit 10 sequentially corrects the "gradation correction data" according to the adjustment operation, sets the corrected "gradation correction data" to the LUT of the gradation point adjustment unit 21, and applies the image signal. Adjustment is made based on the tone characteristics. At this stage, the projection image on the back of the gradation adjustment screen G4 is an image adjusted in real time by the gradation characteristics according to the adjustment contents.

In step S29, the control unit 10 checks whether there is an operation for determining the adjustment contents in accordance with an operation signal from the operation accepting unit 11. If there is a determination operation, the flow advances to step S30. If there is no determination operation, the flow returns to step S27 and the adjustment operation is accepted until there is a determination operation.

In step S30, the control unit 10 causes the image signal processing unit 16 to superimpose the characteristic confirmation screen G5 of Fig. 10A on the image signal. In the characteristic confirmation screen G5, the graph which shows the gradation characteristic in which the gradation point adjustment was performed is displayed.

In step S31, the control unit 10 checks whether there is an operation to confirm the adjustment result by the operation signal from the operation accepting unit 11. If there is a confirmation operation, the flow proceeds to step S32. If there is no confirmation operation, wait for the confirmation operation. In addition, when there is a definite operation, the content adjusted so far is stored in the storage unit 14 as "gradation correction data" of the "custom" characteristic. Moreover, the operation screen for naming the "custom" characteristic adjusted here is displayed, for example, may be a processing routine which attaches and stores the characteristic name of "custom 1", "custom B", etc., for example.

In step S32, the control unit 10 causes the image signal processing unit 16 to superimpose the continuation confirmation screen G6 of Fig. 10B on the image signal. In the continuation confirmation screen G6, a confirmation mark for confirming whether or not the adjustment by the cursor adjustment mode is continued is shown.

In step S33, the control part 10 confirms whether there exists the operation which continues adjustment by the operation signal from the operation acceptance part 11. If the operation has been continued, the process returns to step S22, and the adjustment by the cursor adjustment mode is continued again using the &quot; gradation correction data &quot; adjusted up to this point as the base data. If there is no continuous operation, the continuous confirmation screen G6 is closed to finish the adjustment by the cursor adjustment mode.

Fig. 11 is a diagram showing one aspect when an operation screen is superimposed and displayed on an image. Here, the display position of the characteristic confirmation screen and the gradation adjustment screen is demonstrated.

At step S24, the image selection operation is triggered, and the characteristic confirmation screen G3 of Fig. 9A is superimposed on the image signal. At this time, the display position of the characteristic confirmation screen G3 is displayed as shown in Fig.11. Toward the lower right, a characteristic confirmation screen G3 is displayed. This is because the image signal processing unit 16 controls so that the image portion selected by the selection cursor 51 and the characteristic confirmation screen G3 do not overlap as much as possible. 11, the selection cursor 51 and the characteristic confirmation screen G3 are displayed on the same screen for explanation, but as described above, both are not actually displayed together.

In addition, the display position in the initial setting of operation screens, such as the selection screen G1, the branch screen G2, the characteristic confirmation screens G3, G5, G7, and G9, and the gradation adjustment screens G4 and G8, is displayed on the left side of the image. In the lower part, the display positions of the characteristic check screens G3, G5, G7, and G9 and the gradation adjustment screens G4 and G8 do not overlap with the selected image portion or the image portion corresponding to the selected adjustment point. It is controlled. In addition, the size of these operation screens is set to 1/4 or less of an image area like the characteristic confirmation screen G3.

In addition, in step S24, the reason why the flickering of the image portion is caused by the increase / decrease of ± 32 counts of the output gray scale value and the period of flickering is set to 1 ms.

The output gradation level in a general image display device is represented by 8 to 10 bits, which is a 256 to 1024 output gradation value. Here, when visualizing the screen part by flickering the image part, periodically increasing or decreasing the gray level from "0" to the maximum value by the full scale of the output gray level, the contrast is too large, the image flickers and the observer's eyes I get tired. Moreover, the responsiveness of a display part cannot follow, and there may be an afterimage, and it may become an image with a sense of incongruity. In order to prevent such a phenomenon, it is preferable that the flickering of the selected image portion is performed at a gradation amount of ± 10% or less at full scale of the output gradation value.

Therefore, the amount of increase / decrease of the output gray scale value is set to ± 32 counts, but is not limited thereto, and the gray scale amount may be ± 10% or less at full scale of the output gray scale value.

In addition, the period of flicker is set to 1 ms because the visual characteristics of human beings are generally said to increase the degree of feeling of discomfort due to flicker of images gradually when the flicker cycle exceeds 3 ms. Therefore, the period of blinking is not limited to 1 ms, but may be within the range of 0.5 to 3 ms.

<< flow-3 of the first image adjustment process: Graph adjustment mode >>

Fig. 12 is a flowchart for explaining the operation when customizing the gradation characteristic by the graph adjustment mode. 13 (a) and 13 (c) are diagrams showing one aspect of the characteristic confirmation screen, and FIG. 13 (b) is a diagram showing one aspect of the gradation adjustment screen.

Here, the operation when customizing the gradation characteristics in the graph adjustment mode will be described with reference to Figs. 12 (a), 13 (b), 13 (c), and 2 as appropriate. .

In step S41, the control unit 10 stops the image by the image signal processing unit 16.

In step S42, the control unit 10 causes the image signal processing unit 16 to superimpose the characteristic confirmation screen G7 shown in Fig. 13A on the image signal. The characteristic confirmation screen G7 is displayed with the adjustment point "gradation 1" selected, and the image part corresponding to the adjustment point "gradation 1" is flickering at 1 ms cycle. In addition, the dot display portion D1 of the adjustment point "gradation 1" also flashes in synchronization.

In addition, the display method of a dot display part may change the hue of a dot display part into the hue different from the hue of another dot display part, such as orange color, for example.

In step S43, the control unit 10 checks whether there has been an operation for selecting an adjustment point by an operation signal from the operation accepting unit 11. If there is a selection operation, the flow proceeds to step S44. If there was no selection operation, it waits for a selection operation.

In step S44, the control unit 10 causes the image signal processing unit 16 to flicker the image portion corresponding to the selected adjustment point at 1 ms cycles. In addition, the dot display portion of the selected adjustment point on the characteristic confirmation screen G7 is also flashed in synchronization. In addition, the flickering of the image part is performed by outputting the output gray level value of the selected adjustment point in the "gradation correction data" of the gray level adjustment unit 21 (LUT) to an initial output gray level value plus 32 counts and negative 32 counts. It is performed by switching every time.

In step S45, the control unit 10 checks whether there is an operation for determining the selected adjustment point by the operation signal from the operation accepting unit 11. If there is a determination operation, the flow proceeds to step S46. If there is no determination operation, the flow returns to step S43 and the selection operation is accepted until there is a determination operation.

In step S46, the control unit 10 stops the flicker of the image portion by the image signal processing unit 16 and superimposes the gradation adjustment screen G8 of Fig. 13B on the image signal. In addition, the process routine which closes the characteristic confirmation screen G7 and displays the gradation adjustment screen G8 in step S44 may be sufficient. In the case of this flow, confirmation of the selection determination operation of step S45 is unnecessary, and the flickering of the image portion is stopped by triggering the adjustment operation on the gradation adjustment screen G8.

In step S47, the control unit 10 checks whether there is an operation for adjusting the output gradation value by the operation signal from the operation accepting unit 11. If there is adjustment operation, the flow proceeds to step S48. If there is no adjustment operation, wait for the adjustment operation.

In step S48, the control unit 10 sequentially corrects the "gradation correction data" according to the adjustment operation, sets the corrected "gradation correction data" to the LUT of the gradation point adjustment unit 21, and applies the image signal. Correction based on the gradation characteristics is performed. Accordingly, the projection image adjusted by the corrected gradation characteristics is displayed on the background of the gradation adjustment screen G8.

In step S49, the control unit 10 checks whether there is an operation for determining the adjustment contents in accordance with an operation signal from the operation accepting unit 11. If there is a determination operation, the flow returns to step S42. If there is no determination operation, the flow returns to step S47 and the adjustment operation is accepted until there is a determination operation.

In addition, when there is a determination operation, the operation screen displayed in step S42 becomes the property confirmation screen G9 as shown in Fig. 13C. In the characteristic confirmation screen G9, for example, the output gradation value of the adjustment point "gradation 5" becomes a gradation value including the adjustment content performed previously. This adjustment is already stored in the storage unit 14 as the "gradation correction data" of the "custom" characteristic. In addition, an operation screen for naming the "custom" characteristic adjusted here may be displayed, for example, there may be a processing routine for attaching and storing characteristic names such as "custom 1" and "custom B".

In addition, in this embodiment, after the "custom" characteristic is selected from the plurality of gradation characteristics displayed on the selection screen G1, the branch screen G2, the characteristic confirmation screens G3, G7, G9, and the gradation adjustment screen are displayed on the projected image. (G4, G8) and the OSD unit 20 overlapping the selection cursor 51, the operation unit 1 that accepts the operation according to the above screens, and the control of the OSD unit 20 and the operation unit 1; In addition, the control part 10 which corrects "gradation correction data" according to the operation content to the operation part 1 is corresponded to the gradation characteristic change part of this invention.

As described above, according to the present embodiment, the following effects are obtained.

(1) Since the storage unit 14 stores a plurality of gradation characteristics, including custom characteristics, in which the characteristics themselves used for image adjustment can be customized, the projector 100 has many choices of gradation characteristics, and the user Depending on the choice of various symbols can be.

The image signal processing unit 16 adjusts the image signal according to the selected gradation characteristic when the operation of selecting the gradation characteristic of the selection screen G1 is performed, and projects the image by the adjusted image signal. In the selection step, that is, before the confirmation of the adjustment content, the image including the adjustment content in the background of the selection screen G1 can be confirmed.

Therefore, the projector 100 can adjust an image according to a user's preference, so that the projector 100 can check an image including the adjustment contents at the step of selecting the adjustment contents.

(2) Since the selection screen G1 includes a graph indicating a correlation between the input grayscale level and the grayscale level, the graph showing the selected grayscale characteristics can be visually recognized.

Therefore, the projector 100 can also check the graph which shows the gradation characteristic in addition to the image which included the adjustment content in the selection step of the adjustment content.

(3) Since the OSD unit 20 superimposes the branch screen G2 for selecting either the graph adjustment mode or the cursor adjustment mode on the image signal by triggering the selection decision of the custom characteristic, the branch screen G2. You can select either the graph adjustment mode or the cursor adjustment mode.

Therefore, the projector 100 may select an adjustment method according to a user's preference.

(4) The selection record, which is a record in which the selection of "cursor adjustment mode" or "graph adjustment mode" is selected, is stored in the storage unit 14, and the branch screen (G2) with the adjustment mode of the selection record selected at the next operation. Since this is displayed, the possibility that the user selects and operates the adjustment mode is reduced.

Thus, the projector 100 is convenient to use.

(5) When the custom characteristic is selected, since the characteristic confirmation screen, which is a graph smaller than the image showing the gray scale characteristic of the initial setting of the custom characteristic, is displayed in either the adjustment mode of the "cursor adjustment mode" or the "graph adjustment mode", The gray scale characteristic of the initial setting of a custom characteristic can be confirmed by a confirmation screen.

In addition, in the "graph adjustment mode", if an operation of selecting any one of a plurality of dot display units indicating the output gradation level for each adjustment point in the graph on the characteristic confirmation screen G7 is performed, the OSD unit 20 Since the superimposition of the characteristic confirmation screen G7 is stopped and the gradation adjustment screen G8 smaller than the still image for adjusting the output gradation level of the selected adjustment point is superimposed on the image signal, the gradation adjustment screen G8 By this, the output gradation level of the selected adjustment point can be adjusted.

Therefore, the projector 100 can adjust the image according to the user's preferences after confirming the gradation characteristics by the graph.

(6) When the "cursor adjustment mode" is selected and selected, the selection cursor 51 is displayed, and since the image is stopped, selection of an image portion by the selection cursor 51 which is difficult when the image is moving is performed on the still image. It can be performed easily.

In addition, when the operation of selecting the image portion by the selection cursor 51 is performed, the OSD unit 20 performs the determination operation of the selected image portion and then adjusts the output gradation level at the adjustment point corresponding to the selected image portion. Since the gray scale adjustment screen G4 smaller than the still image is superimposed on the image signal, the gray scale adjustment screen G4 can adjust the output gray level of the selected adjustment point.

Therefore, the projector 100 can easily select a desired image portion and can perform image adjustment according to a user's preference.

(7) The image signal processing unit 16 adjusts the gradation value of the image portion corresponding to the adjustment point in the still image according to the gradation level adjustment operation on the gradation adjustment screens G4 and G8 to the output gradation level which has been adjusted. Therefore, in order to adjust one by one, it is possible to confirm in real time the image including the adjustment contents in the step of adjusting.

Therefore, the projector 100 can adjust the image according to the user's preference and can confirm in real time the image including the adjustment contents in the step of making the adjustment.

(8) Since a plurality of adjustment points in the custom characteristic are allocated many adjustment points in the range of the low tone range to the relay tone range on the input side, the projector 100 is the "image structure" which the user expects the most tonal adjustment. It has many adjustment points in the gradation area required for.

In addition, since the predetermined output gradation value for each adjustment point is set so that the adjustment point of the low gradation range is larger than the adjustment point of the high gradation range, one step of the graph adjustment screen and the gradation adjustment screens G4 and G8. The adjustment amount of this sugar is set to the adjustment amount according to a use request.

Therefore, the projector 100 is convenient to use and can perform image adjustment according to a user's preference.

(9) The size of the operation screen including the selection screen G1, the characteristic confirmation screens G3, G5, G7, and G9, the gradation adjustment screens G4 and G8, and the branch screen G2 is 1/4 or less of the image. For this reason, even if it hides the part hidden by the operation screen, 3/4 or more image of the whole can be confirmed. In addition, since the operation screen is an initial setting, it is arrange | positioned inside any one of four corners in the substantially rectangular image, and the center part which is the center of an image does not hide by the operation screen.

Also, since the OSD unit moves the position of the operation screen within the range of the image so that the selected image portion does not overlap the operation screen, it is possible to confirm the adjustment situation of the selected image portion which is most concerned at the time of adjustment.

Thus, the projector 100 can perform image adjustment while always checking the state of the image.

(10) Since the gradation characteristic of the initial setting by default of the custom characteristic is changeable, and the gradation characteristic of any of the plurality of gradation characteristics stored in the memory | storage part 14 is set, according to user's preference, The gradation characteristic used as a base can be selected.

In addition, the adjusted custom characteristic is stored in the storage unit 14, and the next time the selection screen G1 is displayed, it is displayed as one of the options of the plurality of gradation characteristics, so that it is easy to store the adjusted custom characteristic. Can be reproduced.

Therefore, the projector 100 is convenient to use and can perform image adjustment according to a user's preference.

(11) In the "cursor adjustment mode", the image signal processing unit 16 stops the image when an operation to perform the image adjustment is performed, and displays a selection cursor 51 for selecting a desired image portion on the image. Mark it. Therefore, if the image is a moving image, the image changes, so it is difficult to select an image portion, but selection is easy by stopping the image. In addition, a desired image portion can be selected from the still images by the selection cursor 51.

When the operation of selecting the image part by the selection cursor 51 is performed, the OSD unit 20 blinks the adjustment point corresponding to the gray level of the selected image part or changes the hue of the adjustment point (G3). Is superimposed on the image signal, the gradation of the image portion over the entire gradation range is specified in the graph. Therefore, the adjustment point to be adjusted can be confirmed graphically before the tone adjustment is performed.

In addition, the OSD unit 20 superimposes the gradation adjustment screen G4 of the adjustment point corresponding to the gradation of the selected image portion on the image signal when an operation for determining the selected image portion is performed. The gray scale adjustment of the selected image portion can be performed.

Therefore, the projector 100 can select a desired adjustment portion from the projected image to check the gradation characteristics and then adjust the image of the selected adjustment portion.

(12) The image signal processing unit 16 is any one of a plurality of reference gamma characteristics predetermined in order to make the gray scale characteristic inherent in the liquid crystal light valves 5R, 5G, and 5B suitable for human visual characteristics. Since the gamma correction unit 22 for correcting the correction is performed and the gradation point adjustment unit 21 for adjusting the output gradation value for each of the plurality of adjustment points set according to the input level in the reference γ characteristic, the respective functions are independent. It is performed in a dedicated component site. Therefore, since each structure can be diversified, it can be set as a simple structure.

In addition, since the gradation adjustment to the image signal as the image signal processing section 16 is performed by the gradation characteristics obtained by combining γ correction in the gamma correction section 22 and gradation point adjustment in the gradation point adjustment section 21, 2 The gray scale adjustment can be performed by the dog adjustment site.

In addition, in the gradation adjustment screens G4 and G8 of the selected adjustment point, when the adjustment of the output gradation value is made, the gradation point adjustment unit 21 changes the output gradation value of the adjustment point according to the adjustment contents. The image on the back of (G4, G8) is updated to the image reflecting the adjustment contents in real time.

Therefore, according to the projector 100, a high gradation adjustment is possible by the simple gradation adjustment structure, and the image which reflected the adjustment content can be confirmed in real time.

(13) In the "cursor adjustment mode", the selection cursor 51 includes a pixel selection unit 52 having a size for selecting a plurality of consecutive pixels of three or more pixels in the pixel of the liquid crystal light valve. Therefore, the selection site intended by the user can be determined based on the pixel data of the plurality of pixels having the width.

Further, the adjustment point corresponding to the selected image portion excludes the maximum and minimum gradation values in the gradation values for the plurality of pixels selected by the pixel selection unit or the gradation values for the plurality of pixels selected by the pixel selection unit. Since the adjustment point of the input gradation level closest to the average value is selected, the influence by the pixel data including noise can be reduced and the adjustment point corresponding to the image portion intended by the user can be selected.

Thus, the projector 100 can accurately select the adjustment site intended by the user from the projected image.

(14) In the "cursor adjustment mode", the pixel selector 52 most suitably has a size for selecting a total of nine pixels in a quadrangular shape consisting of three pixels each in length and width, so that pixels having the maximum and minimum gradation values are selected. Even in the case where the average value is excluded, effective pixel data of seven pixels is obtained. Moreover, since it becomes a moderate size among all the images, it is easy to visually recognize it, and since it is a square shape, it is easy to select an image part.

Therefore, the projector 100 can easily and accurately select the adjustment site intended by the user from the projected image.

(15) In the "cursor adjustment mode", the selection cursor 51 has an annular portion 53 including a shape in which a part of the outer shape of the pixel selection portion 52 is made larger on the outer circumference of the pixel selection portion 52. And the annular portion 53 always maintains a relative position with the pixel selector 52, and moves the still image on with the pixel selector 52, so that the selection cursor 51 has a pixel selector. It becomes the characteristic form which has the annular part 53 much larger than 52, and is displayed largely and clearly by the image.

In addition, the image signal processing unit 16 adjusts the color tone of the selection cursor 51 to the color tone of the image portion selected by the selection cursor 51 and the color tone of the higher contrast of any one color tone of white or black. Therefore, the color tone of the selection cursor 51 becomes a color tone which is easy to see.

Therefore, it is easy to select a desired image part by the selection cursor 51 displayed clearly.

Therefore, according to the projector 100, the desired image portion can be easily selected by the selection cursor displayed clearly on the image.

(16) In the "cursor adjustment mode", in the selection operation of the image portion by the selection cursor 51, the position of the pixel selection portion 52 is set so that the entire picture of the pixel selection portion 52 does not deviate from the still image. Controlled by the signal processor 16, and when the pixel selector 52 reaches the edge of the still image, the selection cursor 51 displays a part of the image of the annular portion 53 deviated from the still image in a distorted state. Therefore, it is possible to select the image up to the image portion of the edge of the image by the selection cursor 51, and the selection cursor 51 can be visually recognized even when the edge of the image is selected.

Therefore, the projector 100 can select a desired image portion in all effective image areas by the selection cursor.

(17) In the "cursor adjustment mode", the image signal processing unit 16 stops the image and causes the display unit to display a selection cursor 51 for selecting a desired image portion on the image. Therefore, if the image is a moving image, the image changes, so it is difficult to select an image portion, but selection is easy by stopping the image. In addition, a desired image portion can be selected from the still images by the selection cursor 51.

In addition, since the image signal processing unit 16 flickers the selected image portion in the still image and the image portion having approximately the same gradation as the selected image portion when the image portion is selected from the still image by the selection cursor 51, these images The site is displayed separately from other image sites. Thus, the selected image portion can be clearly seen. In addition, even if the unexpected part is selected by this, it can identify at a glance.

Therefore, the projector 100 can select a desired image adjustment portion from the display image, so that the selected image portion can be clearly recognized.

(18) In the "cursor adjustment mode", the flickering of the image portion selected by the selection cursor 51 and the image portion having a gray level substantially equal to the image portion is divided into a plurality of input gray level levels corresponding to the image signal representing the still image. Since it is performed by periodically increasing or decreasing the output gray level value at the adjustment point of the input gray level level closest to the gray level value of the selected image portion among the adjustment points, it is selected by a simple method of increasing or decreasing the output gray level value at one adjustment point. The burn site and the roughly the same gradation site can be flickered.

Therefore, according to the projector 100, it is possible to recognize and identify the selected image portion and the image portion selected together by a simple method.

(19) The image signal processing unit 16 is a gamma correction unit 22 for correcting the intrinsic gradation characteristic in the display unit to any one of the plural basic gradation characteristics predetermined in order to make it suitable for human visual characteristics. ) And a gradation point adjustment section 21 for adjusting output gradation values for a plurality of adjustment points set according to the input levels in the basic gradation characteristics, and each is a one-dimensional LUT. It is composed. Therefore, the correction data set for each LUT is not complex data but a simple data structure.

In addition, since the image portion selected by the selection cursor 51 and the image portion having the same gradation as the image portion are flickered by the gradation point adjustment section 21, the image portion is not affected without affecting the basic gradation characteristics. Can be flickered

Thus, the projector 100 can recognize and identify the image portion selected and the image portion selected together by a simple configuration.

(20) The amount of increase or decrease of the output gray scale value for flickering the adjustment point corresponding to the image portion selected by the selection cursor 51 in the "cursor adjustment mode" or the image portion at the adjustment point selected in the "graph adjustment mode". Since the increase / decrease amount is ± 10% or less with respect to the full scale of the output gray scale value in the gray scale characteristic, the image portion can be visually recognized without causing the observer's eyes to be tired by an appropriate contrast. In addition, the response of the display unit can also be sufficiently followed.

Moreover, since the flickering period of the said image site | part is 0.5-3 microseconds or less, the said image site | part can be visually recognized without giving the unpleasant feeling of a blink.

Therefore, according to the projector 100, the selected image part can be visually recognized without causing discomfort.

(21) The flashing cycle of the image portion selected by the selection cursor 51 in the "cursor adjustment mode" or the image portion corresponding to the adjustment point selected in the "graph adjustment mode", and the characteristic confirmation screens G3 and G7. The blinking period of the dot display unit is synchronized.

Therefore, it is possible to visually recognize that the dot display portions of the selected image portions and the corresponding adjustment points on the characteristic confirmation screens G3 and G7 represent the same selection portions. In addition, synchronizing the cycles does not cause visual discomfort.

Therefore, according to the image display apparatus according to the present invention, it is possible to visually know that the selected image portion and the dot display portion correspond.

(Embodiment 2)

<< flow of 2nd image adjustment process-to branch screen >>

14 is a flowchart for explaining the operation of the projector 100 when performing "gamma" adjustment. Fig. 15A shows one aspect of the selection screen, and Fig. 15B shows one aspect of the branch screen.

Here, the flow of processing from the second aspect of image adjustment by the projector 100 of the first embodiment to the branch screen in Fig. 14 is appropriately centered around Fig. 14, Figs. 15 (a), 15 (b), and Fig. It demonstrates using 2. In addition, about the same part as Embodiment 1, the same code | symbol is used and the overlapping description is abbreviate | omitted.

In the image adjustment of Embodiment 2, the flow of a process, the function of an operation screen, etc. differ from the image adjustment process of Embodiment 1. FIG. For this reason, the "gradation adjustment program" which prescribes the order and content of image adjustment in Embodiment 2 is a thing different from the said program of Embodiment 1, and accordingly, a part of operation screen in OSD memory 18 is also implemented. The screen of the form different from the operation screen of the form 1 is memorize | stored. In addition, as for the reference (gamma) characteristic in a "custom" characteristic, (gamma) value 2.4 is previously set by operation of the operation part 1. As shown in FIG.

The projector 100 is installed in an environment as shown in FIG. 1 and is operated by the operation unit 1.

In step S51, the control unit 10 checks whether there is an operation for performing "gamma" adjustment by the operation signal from the operation accepting unit 11. If there is an operation to perform "gamma" adjustment, the flow proceeds to step S52. If there is no operation, it continues to wait for the operation. By this operation, the &quot; gradation adjustment program &quot; of the storage unit 14 is started, and the following processing is performed in accordance with the order and content of the gradation adjustment specified in the program.

In step S52, the control unit 10 causes the image signal processing unit 16 to superimpose the selection screen G10 shown in Fig. 15A on the image signal.

The selection screen G10 is the same as the selection screen G1 in Fig. 7A. In the selection screen G10, the "custom" characteristic is selected, but the graph is in the shape of a curve compared with the graph in the selection screen G1. This is because, as γ value 2. 4 is set as the reference γ characteristic in the “custom” characteristic, γ value 2. 4 is shown on the scale of the graph with γ value 2. 2 as the reference linear characteristic.

In step S53, the control unit 10 checks whether there is a selection operation of selecting one of the characteristics from the selection of the gradation characteristics of the selection screen G10 by the operation signal from the operation accepting unit 11. If there is a selection operation, the flow proceeds to step S54. If there is no selection operation, the operation continues to wait.

In step S54, the control unit 10 updates the selection screen G10 by the image signal processing unit 16 in accordance with the selected content. The update content of the selection screen G10 is to display a display (for example, "2.3", etc.) indicating the selected gradation characteristics on the left side of the screen as the selection display. The tone adjustment of the background image is not performed at this stage.

In step S55, the control unit 10 checks whether there is a determination operation for determining the gradation characteristic selected by the operation signal from the operation accepting unit 11. If there is a determination operation, the flow proceeds to step S56. If there is no determination operation, the flow returns to step S53 to accept the selection operation until the determination operation is made.

In step S56, the controller 10 checks whether the determined gradation characteristic is a “custom” characteristic. If it is a "custom" characteristic, the flow proceeds to step S58. If it is not the "custom" characteristic, it progresses to step S57. In the case of the &quot; custom &quot; characteristic, the operation for selecting and determining the &quot; custom &quot; characteristic is performed because the process shifts to a process for changing the correlation between the gray scale characteristic, that is, the input gray scale value and the output gray scale value. Corresponds to the start operation for starting to change.

In step S57, the control unit 10 sets γ correction data of the selected gradation characteristic to the LUT of the gamma correction unit 22, and projects an image adjusted by the gradation characteristic. In addition, the flow returns to step S53 to wait for the operation of selecting the gradation characteristic again. In this step, the projection image on the back of the selection screen G10 becomes an image adjusted by the selected gradation characteristic, and the selected gradation characteristic is graphically displayed on the selection screen G10. In addition, in order to complete adjustment, just press the "Menu button" of the operation part 1 or the remote control 2 according to the display of the selection screen G10 lower.

Subsequently, the case where it is a "custom" characteristic in step S56 is demonstrated.

In step S58, the control unit 10 causes the image signal processing unit 16 to superimpose the branch screen G11 shown in Fig. 15B on the image signal. Branch screen G11 is the same as branch screen G2 of FIG. In the branch screen G11, the graph adjustment mode is selected.

In step S59, the control unit 10 checks whether or not there is an operation of selecting and determining the "cursor adjustment mode" by the operation signal from the operation accepting unit 11. If there has been a selection decision operation, proceed to the subroutine of "Cursor adjustment mode". If there is no selection decision operation, the flow proceeds to step S60.

In step S60, the control unit 10 checks whether there is an operation of selecting and determining the "graph adjustment mode" by the operation signal from the operation accepting unit 11. If there is a decision operation, proceed to the subroutine of the "graph adjustment mode". If there is no determination operation, the flow returns to step S58 to wait for the selection and determination operation.

<< flow of 2nd image adjustment process-2: Cursor adjustment mode >>

Fig. 16 is a flowchart for explaining the operation when customizing the gray scale characteristic by the cursor adjustment mode. 17 (a) and 17 (b) are diagrams showing one aspect of the graph adjustment screen, and FIG. 17 (c) is a diagram showing one aspect of the continuous confirmation screen.

Here, the flow of image adjustment in the cursor adjustment mode in the second aspect of the image adjustment of the projector 100 will be described with reference to Figs. 16 (a), 17 (b) and 17 (c) as appropriate. Will be described with reference to FIG. 2.

In step S71, the control unit 10 stops the image by the image signal processing unit 16. This is because it is difficult to select an image part in the state of a moving image.

In step S72, the control unit 10 superimposes the "selection cursor" on the image signal by the image signal processing unit 16. This state is the same as, for example, the selection cursor 51 on the image on the screen SC of FIG.

In step S73, the control unit 10 checks whether there is an image selection operation of selecting a predetermined image portion by the "selection cursor" in response to an operation signal from the operation accepting unit 11. If there is an image selection operation, the flow proceeds to step S74. When there is no image selection operation, it waits for an image selection operation.

In step S74, the control unit 10 causes the image signal processing unit 16 to flicker the selected image portion and the image portion having a gradation substantially equal to the gradation of the image portion, and adjust the graph in Fig. 17A. The screen G12 is superimposed on the image signal.

In this process, first, the control unit 10 reads image data for each color of RGB in the image portion selected by the "selection cursor" from the frame memory 17, and outputs luminance signal data (Y) from the image data of each pixel. Signal data). Next, the average value of the Y signal data except the maximum and minimum gray scale values of the Y signal data of each pixel is obtained. Then, the adjustment point nearest to the obtained Y signal data is selected as the adjustment point to be adjusted.

In addition, the flickering of the image part is performed by outputting the output gray level value of the selected adjustment point in the "gradation correction data" of the gray level adjustment unit 21 (LUT) to an initial output gray level value plus 32 counts and negative 32 counts. It is performed by switching every time.

In addition, the graph adjustment screen G12 shows the state in which the adjustment point "gradation 3" is selected, and the hue of the dot display part D3 of the adjustment point "gradation 3" is different from the hue (white) of other dot display parts. For example, it is orange. In addition, the display method of a dot display part may be made to flash, for example in synchronization with the flicker of an image part.

In the graph adjustment screen (G12), “orange” is the adjustment target. Adjust the gradation. ”Is displayed, and an indicator 55 is further provided for confirming the adjustment status of the adjustment point corresponding to the selected image portion. The indicator 55 enlarges and displays the adjustment situation as the dot display portion of the selected adjustment point rises and falls by the adjustment.

In addition, the position and size of the graph adjustment screen G12 displayed on the image are the same as those of the characteristic confirmation screen G3 of FIG. 11, and the image signal processing unit 16 does not overlap with the image portion selected by the selection cursor 51. It is controlled by.

In step S75, the control unit 10 checks whether there is an operation for adjusting the output gradation value in response to an operation signal from the operation accepting unit 11. If there is adjustment operation, the flow proceeds to step S76. If there is no adjustment operation, wait for the adjustment operation.

In step S76, the control unit 10 stops flickering of the image portion by the image signal processing unit 16, corrects the "gradation correction data" in turn according to the adjustment operation, and corrects the "gradation correction". Data ”is set in the LUT of the gradation point adjustment section 21, and the adjustment based on the gradation characteristics is performed on the image signal. In addition, the graph adjustment screen is updated, and as shown in the graph adjustment screen G13 of FIG. 17B, a graph display reflecting the adjustment contents is displayed, and the text "Please confirm the adjustment result" is displayed. In this step, the projection image on the back of the graph adjustment screen G13 is an image adjusted in real time by the gradation characteristics according to the adjustment contents.

In step S77, the control unit 10 checks whether there is an operation for determining the adjustment contents in accordance with an operation signal from the operation accepting unit 11. If there is a determination operation, the flow proceeds to step S78. If there is no determination operation, the flow returns to step S75 and the adjustment operation is accepted until there is a determination operation.

In addition, when there is a determination operation, the content adjusted so far is stored in the storage unit 14 as "gradation correction data" of the "custom" characteristic.

In step S78, the control unit 10 causes the image signal processing unit 16 to superimpose the continuation confirmation screen G14 shown in Fig. 17C on the image signal. In the continuation confirmation screen G14, a confirmation display for confirming whether or not the adjustment by the cursor adjustment mode is continued is shown.

In step S79, the control unit 10 checks whether there is an operation for continuing the adjustment by the operation signal from the operation accepting unit 11. If the operation has been continued, the process returns to step S72, and the adjustment by the cursor adjustment mode is continued again using the &quot; gradation correction data &quot; adjusted up to this point as the base data. If there is no continuous operation, the continuous confirmation screen G14 is closed to finish the adjustment by the cursor adjustment mode.

<< flow-3 of a second image adjustment process: Graph adjustment mode >>

Fig. 18 is a flowchart for explaining the operation when customizing the gradation characteristic by the graph adjustment mode. 19 (a) and 19 (b) are diagrams showing one aspect of the graph adjustment screen.

Here, the operation at the time of customizing the gradation characteristics in the graph adjustment mode will be described with reference to Figs. 18 (a), 19 (b) and 2 as appropriate.

In step S81, the control unit 10 stops the image by the image signal processing unit 16. This is because it is difficult to select an image part in the state of a moving image.

In step S82, the control unit 10 causes the image signal processing unit 16 to superimpose the graph adjustment screen G15 of Fig. 19A on the image signal. The graph adjustment screen G15 is displayed with the adjustment point "gradation 1" selected, and the image portion corresponding to the adjustment point "gradation 1" is flickering at 1 ms cycles. In addition, the color tone of the dot display part D1 of the adjustment point "gradation 1" is different from the color tone (white) of another dot display part, for example, orange.

An operation description sentence is displayed on the graph adjustment screen G15, and in addition, there is an indicator 55 for confirming the adjustment status of the selected adjustment point.

In step S83, the control unit 10 checks whether there has been an operation for selecting an adjustment point by an operation signal from the operation accepting unit 11. If there is a selection operation, the flow proceeds to step S84. If there was no selection operation, it waits for a selection operation.

In step S84, the control unit 10 causes the image signal processing unit 16 to flicker the image portion corresponding to the selected adjustment point at 1 ms cycles. Also, the color tone of the dot display portion of the selected adjustment point on the graph adjustment screen is changed to orange. Incidentally, the flickering of the image part is performed by outputting the output gray level value of the selected adjustment point in the "gradation correction data" of the gray level adjustment unit 21 (LUT) to an initial output gray level value plus 32 counts and a negative 32 count. It is performed by switching every time.

In step S85, the control unit 10 checks whether there is an operation of adjusting the output gradation value in response to an operation signal from the operation accepting unit 11. If there is adjustment operation, the flow proceeds to step S86. If there is no adjustment operation, wait for the adjustment operation.

In step S86, the control unit 10 sequentially corrects the "gradation correction data" according to the adjustment operation, sets the corrected "gradation correction data" to the LUT of the gradation point adjustment unit 21, and applies the image signal. Correction based on the gradation characteristics is performed. In addition, the graph adjustment screen is updated, and the graph display reflecting the adjustment contents is made. At this stage, the projection image on the back of the graph adjustment screen is an image adjusted in real time by the gradation characteristics according to the adjustment contents.

In step S87, the control unit 10 checks whether there is an operation for determining the adjustment contents in accordance with an operation signal from the operation accepting unit 11. If there is a determination operation, the graph adjustment screen G16 is closed to complete the adjustment. If there is no determination operation, the flow returns to step S83 to accept the selection and adjustment operation until the determination operation is made.

The graph adjustment screen G16 in Fig. 19B shows a state where a plurality of selection and adjustment operations are performed. Since the output gradation value of the adjustment points "gradation 2-7" was adjusted by several times of adjustment, it becomes a customized gradation characteristic different from the gradation characteristic which became the base of the graph adjustment screen G15.

In addition, in this embodiment, after the "custom" characteristic is selected from the plurality of gradation characteristics displayed on the selection screen G10, the branch screen G11, the graph adjustment screens G12, G13, G15, and G16 are selected on the projected image. The OSD unit 20 overlapping the cursor 51, the operation unit 1 that accepts the operation according to the respective screens, the OSD unit 20 and the operation unit 1 are controlled, and the operation unit 1 is controlled. The control part 10 which corrects "gradation correction data" according to an operation content is corresponded to the gradation characteristic change part of this invention.

As described above, according to the present embodiment, the following effects are obtained in addition to the effects of the first embodiment.

(1) When the custom characteristic is selected, the graph adjustment screens G12 and G15 including a graph showing the gradation characteristics of the initial setting of the custom characteristic are displayed in either the adjustment mode of the "cursor adjustment mode" or the "graph adjustment mode". Since the graph adjustment screens G12 and G15 have an output gradation level for each of the plurality of adjustment points set according to the input gradation level, and have a plurality of dot display sections for adjusting gradation characteristics, the graph adjustment screens G12, G15) allows adjustment of the gradation characteristic itself while confirming the gradation characteristic of the initial setting of the custom characteristic.

Therefore, the projector 100 can adjust the image according to the user's preference while confirming the gradation characteristics by the graph.

(2) Since the image signal processing unit 16 flickers the image portion corresponding to the selected adjustment point at 1 ms cycles, and changes the hue of the dot display portion of the selected adjustment point on the graph adjustment screens G12 and G15 to orange, It can be visually recognized that the image part which is flickering corresponds to the orange gradation point in gradation characteristic.

Thus, the projector 100 can visually know that the selected image portion corresponds to the dot display portion.

(3) The image signal processing unit 16 adjusts the gradation value of the image portion corresponding to the adjustment point in the still image in accordance with the adjustment operation of the gradation level on the graph adjustment screens G12 and G15. Since the image is adjusted one by one, it is possible to confirm in real time the image including the adjustment contents in the step of adjusting.

In addition, the graphs and indicators 55 of the graph adjustment screens G12 and G15 can confirm the adjustment state of the gradation characteristics in real time.

Therefore, the projector 100 can confirm in real time the image including the adjustment situation and the adjustment content of the gradation characteristics in the step of adjusting.

(4) The operation screens displayed in the "graph adjustment mode" are only graph adjustment screens G15 and G16. Since all adjustment operations can be completed by one type of operation screen, the operation efficiency is good.

In addition, since the adjustment of one adjustment point is not necessary, the adjustment operation and the continuous confirmation are not required, and other adjustment points can be adjusted continuously, so the adjustment efficiency is good. In addition, since the gray scale characteristic being adjusted can be visually recognized by a graph and an image, it is easy to grasp the adjustment situation.

Therefore, the projector 100 is convenient to use and can perform image adjustment according to a user's preference.

In addition, this invention is not limited to said embodiment, A various change, improvement, etc. can be added to said embodiment. Modifications are described below.

(Modification 1)

This will be described with reference to FIG. 2. In each of the above embodiments, the selection of the image portion and the adjustment of the output gray scale value in the cursor adjustment mode were performed by the "up and down buttons" and "left and right buttons" of the operation unit 1 or the remote control unit 2, but the present invention is not limited thereto. It is not. For example, a track ball is provided in the remote control unit 2 as a pointing device, and the storage unit 14 stores a device driver corresponding to the track ball. The adjustment operation of the output gradation value may be performed.

According to this configuration, the projector 100 can efficiently perform the adjustment operation.

(Modification 2)

This will be described with reference to FIG. 2. In each of the above embodiments and modifications, "gradation point adjustment" and "γ correction" have been described as being performed using the Y signal of the YUV signal, but the present invention is not limited thereto.

For example, in the storage unit 14, a luminance table for comparing the luminance data for each corresponding color signal from each pixel data of the RGB signal is created, and the &quot; gradation point adjustment &quot; "Γ correction" may be performed.

Even in this configuration, the same effects as in the above embodiments and modifications can be obtained.

(Modification 3)

This will be described with reference to FIG. 2. In each of the above embodiments and modifications, the projector 100 has been described as a liquid crystal three-plate projection type projector using three liquid crystal light valves 5R, 5G, and 5B as light modulation elements, but is not limited thereto.

For example, the projector may have a configuration in which red, green, and blue color filters are regularly arranged in a lattice form, and use a single-plate liquid crystal light valve capable of emitting full color modulated light in one sheet. . Moreover, it is good also as a structure using a reflection type liquid crystal display device or a tilt mirror device. It is also very suitable for a rear projector which is a projector having such a light modulation element and a screen.

Even in these configurations, the same effects as in the above embodiments and modifications can be obtained.

(Modification 4)

This will be described with reference to FIG. 2. In each of the above embodiments and modifications, the image display device is described as being a projector, but is not limited to the projector. The image display apparatus may be an image display apparatus which displays an image represented by an input image signal on a display unit.

For example, it is possible to apply to a CRT display, a liquid crystal display, a plasma display, an organic EL display, a field emission display, etc., and the effect similar to each said embodiment and a modification can be acquired.

As described above, according to the present invention, there is provided an image display device and an image adjustment method capable of easily performing flexible image adjustment according to a user's preference.

Claims (39)

An image signal processing unit for adjusting an input gray level value included in the image signal in accordance with a predetermined gray scale characteristic with respect to the input image signal; A display unit for displaying an image based on an image signal including an output gray scale value adjusted by the image processor; And A gradation characteristic changing section for changing a correlation between the input gradation value and the output gradation value defined by the gradation characteristic, The gradation characteristic changing unit, An OSD unit for superimposing and displaying a characteristic confirmation screen including a selection cursor for selecting a desired image portion on the image and a graph indicating the correlation and a gray scale adjustment screen for changing the correlation; And An operation unit for performing a start operation for starting the change of the correlation, an image selection operation for selecting the image portion by the selection cursor, and an image determination operation for determining the image portion selected by the image selection operation; , When the start operation is made, the selection cursor is superimposed on the image, When the image selection operation is made, the characteristic confirmation screen is overlaid on the image signal, and an adjustment point corresponding to the gradation value of the selected image portion is specified on the graph, When the image determination operation is made, the gray scale adjustment screen for changing the correlation at the adjustment point is superimposed on the image. Image display device. The method of claim 1, An OSD unit for displaying a selection screen for superimposing on the image a selection screen for determining a gradation characteristic to be applied among a plurality of gradation characteristics including a custom characteristic whose correlation can be changed; And An operation unit that accepts a selection operation for selecting one of the plurality of gradation characteristics and a determination operation for determining a gradation characteristic selected by the selection operation while the selection screen is displayed; And The image signal processing unit, The image signal is adjusted according to the gradation characteristic determined by the determination operation, and in the state where the selection screen is overlapped, the adjustment according to the selected gradation characteristic is performed in the step where the selection operation is performed. Conducted on Image display device. delete The method of claim 1, The gradation characteristic changing unit, An OSD section for displaying a selection cursor for selecting a desired image portion on the image, superimposed on the image; And An operation unit for performing a start operation for starting the change of the correlation and an image selection operation for selecting the image portion by the selection cursor, When the start operation is made, the selection cursor is superimposed on the image, When the image selection operation is performed, the image portion having the same gradation value as the selected image portion is flickered, and a gradation adjustment screen for changing the correlation in the flickered image portion is displayed on the image. Nesting Image display device. As an image display device for displaying an image represented by an image signal on a display unit, A storage unit for storing a plurality of gradation characteristics including custom characteristics, in which the characteristics themselves used for adjustment of the gradation characteristics in the image signal can be customized; An OSD unit superimposing a selection screen for selecting one of the plurality of gradation characteristics on the image signal; An operation unit configured to select at least one of the gradation characteristics from at least the selection screen and to determine selection contents; And An image signal processing unit that performs image processing including adjustment of the gradation characteristics to the image signal And The image signal processing unit adjusts the gradation characteristic of the image signal according to the selected gradation characteristic when the operation of selecting the gradation characteristic of the selection screen is performed by the operation unit, and the image according to the adjusted image signal To display on the display unit Image display device. The method of claim 5, The selection screen includes a graph indicating a correlation between the input gradation characteristic and the output gradation level of the selected gradation characteristic. Image display device. The method of claim 5, If the operation unit selects the custom characteristic of the selection screen and determines the selection content, The image signal processing unit performs image processing on the image signal based on the gradation characteristic of the custom characteristic, The OSD unit stops overlapping of the selection screen, and superimposes a graph adjustment screen including a graph indicating a gray scale characteristic of the initial setting of the custom characteristic on the image signal, The graph adjustment screen has an output gradation level for each of a plurality of adjustment points set according to the input gradation level, and has a plurality of dot display sections for adjusting the gradation characteristics. Image display device. The method of claim 5, If the operation unit selects the custom characteristic of the selection screen and determines the selection content, The OSD unit stops the overlapping of the selection screen, and superimposes the characteristic confirmation screen on the image signal, which is a graph indicating the gradation characteristic of the initial setting of the custom characteristic, The image signal processing unit performs image processing on the image signal based on the gradation characteristic of the custom characteristic, In the operation unit, when an operation of selecting any one of a plurality of dot display units indicating an output gradation level for each adjustment point in the graph is made, The OSD unit stops the superimposition of the characteristic check screen and superimposes a gray scale adjustment screen for adjusting the output gray level of the selected adjustment point on the image signal. Image display device. The method of claim 5, If the operation unit selects the custom characteristic of the selection screen and determines the selection content, The OSD unit stops the overlapping of the selection screen, and superimposes a selection cursor for selecting a desired image portion on the image on the image signal. The image signal processing unit stops an image by an image signal subjected to image processing based on the gradation characteristic of the custom characteristic, Further, when the operation of selecting the image portion by the selection cursor is made by the OSD unit, the output gradation level respectively indicating output gradation levels for a plurality of adjustment points set according to an input gradation level for adjusting the gradation characteristics. The graph adjustment screen having the plurality of adjustable dot display sections is superimposed on the image signal. Image display device. The method of claim 5, If the operation unit selects the custom characteristic of the selection screen and determines the selection content, The OSD unit stops the overlapping of the selection screen, and superimposes a selection cursor for selecting a desired image portion on the image on the image signal. The image signal processing unit stops an image by an image signal subjected to image processing based on the gradation characteristic of the custom characteristic, In addition, when the OSD unit is operated to select the image portion by the selection cursor, a gray scale adjustment screen for adjusting an output gray level at the adjustment point of the gray scale characteristic corresponding to the selected image portion is applied to the image signal. Nesting Image display device. The method according to any one of claims 7 to 10, Further, the image signal processing unit according to the output gradation level of the adjustment operation of the gradation value of the image portion corresponding to the adjustment point in the image according to the gradation level adjustment operation on the graph adjustment screen or the gradation adjustment screen. Turn to turn Image display device. The method according to any one of claims 7 to 10, If the operation unit selects the custom characteristic of the selection screen and determines the selection content, Prior to the transition to the graph adjustment mode by the graph starting from the graph adjustment screen and the property confirmation screen or the cursor adjustment mode starting from the selection cursor, the OSD unit stops the overlapping of the selection screen and adjusts the graph. To superimpose a branch screen for selecting either a mode or the cursor adjustment mode on an image signal Image display device. The method of claim 12, If the graph selected on the branch screen or the selection record in the cursor image adjustment mode is stored in the storage unit, and an operation for selecting the custom characteristic of the selection screen to the operation unit next time is made, The OSD unit superimposes the branch screen on which the image adjustment mode of the selection recording in the storage unit is selected, on the image signal. Image display device. The method of claim 11, The size of the operation screen including the selection screen, graph adjustment screen, characteristic confirmation screen and gradation adjustment screen is less than 1/4 of the image. Image display device. The method of claim 9 or 10, The operation screen including the graph adjustment screen, the property confirmation screen, and the gradation adjustment screen is an initial setting, and is disposed inside any one of four corners in the substantially rectangular image, and the OSD unit is configured to display the selected image portion and the To move the position of the operation screen within the range of the image so that the operation screen does not overlap Image display device. The method according to any one of claims 5 to 10, The gradation characteristic of the initial setting by default of the said custom characteristic is changeable, and the gradation characteristic of any one of the several gradation characteristics including the linear gradation characteristic memorize | stored in the said memory | storage part is set. Image display device. The method according to any one of claims 5 to 10, The custom characteristic adjusted in the graph adjustment screen or the gradation adjustment screen is stored in the storage unit, and is displayed as one of the choices of the gradation characteristics when the selection screen is next displayed. Image display device. An image display device according to any one of claims 5 to 10, A light source unit for supplying light; An optical modulation element as said display portion which modulates the light emitted from said light source portion into modulated light representing an image defined in said image signal; And A projector having a projection lens for enlarging and projecting the modulated light Image display device. An image display apparatus for displaying an image represented by an image signal on a display unit, A characteristic confirmation screen including a selection cursor for selecting a desired image portion on the image, and a graph showing a correlation between input and output gradation levels of gradation characteristics in the initial setting of the image, and a plurality of characteristics in gradation characteristics of the image. An OSD unit for superimposing a gradation adjustment screen for adjusting the gradation for each adjustment point on the image signal; An operation unit configured to start at least adjustment of the gradation characteristic of the image, an operation of selecting the image portion by the selection cursor, and an operation of determining the selected image portion; And When the image adjustment including the adjustment of the gradation characteristic is performed to the image signal, and the operation to perform the image adjustment is performed on the operation unit, the image is stopped and the selection cursor is moved by the OSD unit to the display unit. Image signal processing unit to display on And The OSD unit, when the operation of selecting the image part by the selection cursor is performed by the operation unit, the characteristic of flashing the adjustment point corresponding to the gradation of the selected image part or changing the color tone of the adjustment point Superimpose a confirmation screen on the image signal, In addition, when an operation of determining the selected image part is performed by the operation unit, the gray scale adjustment screen of the adjustment point corresponding to the gray level of the selected image part is superimposed on the image signal, The selection cursor comprises a pixel selection section having a size for selecting a plurality of consecutive pixels of three or more pixels in the pixels of the display section, The adjustment point of the gradation characteristic corresponding to the selected image portion is an average value of gradation values for a plurality of pixels selected by the pixel selection unit or a maximum in gradation values for a plurality of pixels selected by the pixel selection unit. The adjustment point of the input gradation level closest to the average value except the minimum gradation value is selected. Image display device. The method of claim 19, The image signal processing unit, A gamma correction unit for correcting the intrinsic gradation characteristic in the display unit to at least one basic gradation characteristic among a plurality of predetermined basic gradation characteristics so as to be suitable for at least an installation environment; And A gradation point adjustment section for adjusting output gradation values for a plurality of adjustment points set according to input levels in the basic gradation characteristics, The gradation adjustment to the image signal by the image signal processing section is performed by the gradation characteristics obtained by combining the gradation correction in the gamma correction section and the gradation adjustment in the gradation point adjusting section, In the gradation adjustment screen of the selected adjustment point, when the output gradation value is adjusted, the gradation point adjustment unit changes the output gradation value of the adjustment point according to the adjustment contents. Image display device. delete The method of claim 19, The pixel selector has a size for selecting a total of 9 pixels in a square shape consisting of 3 pixels each in length and width. Image display device. The method of claim 19, The selection cursor further includes an annular portion including a shape in which a part of the outer shape of the pixel selection portion is further enlarged on an outer circumference of the pixel selection portion, The annular portion always maintains a relative position with the pixel selector, and moves the still image on with the pixel selector. Image display device. The method of claim 23, wherein In the selection operation of the image portion by the selection cursor, the position of the pixel selection portion is controlled by the image signal processing portion so that the entire picture of the pixel selection portion does not deviate from the still image, and the pixel selection portion is stopped. When the edge of the image is reached, the selection cursor is displayed in a state where an image of a part of the annular portion deviating from the still image is distorted. Image display device. The method according to any one of claims 19, 20, 22-24, The color tone of the selection cursor is set to either white or black, The OSD unit adjusts the hue of the selection cursor to a hue of the portion of the image selected by the selection cursor and a hue of a higher contrast of any one of white or black hue. Image display device. An image display apparatus for displaying an image represented by an image signal on a display unit, An OSD unit which superimposes a selection cursor for selecting a desired image portion on the image on the image signal; An operation unit for performing an operation of starting adjustment of at least the gradation characteristic of the image and a selection operation of the image portion by the selection cursor; And When the image adjustment including the adjustment of the gradation characteristic is performed to the image signal, and the operation to perform the image adjustment is performed on the operation unit, the image is stopped and the image which displays the selection cursor by the OSD unit. Signal processor And The image signal processing unit, when the image portion is selected from the still image by the selection cursor, causes the selected image portion in the still image and an image portion having a gray level substantially equal to the selected image portion to be flickered. Image display device. The method of claim 26, The flickering of the image portion selected by the selection cursor and the image portion having the same gradation as the image portion is the selected image from among a plurality of adjustment points corresponding to the input gradation level in the gradation characteristic of the image signal representing the still image. Is performed by periodically increasing or decreasing the output gradation value at the adjustment point of the input gradation level closest to the gradation value of the site. Image display device. The method of claim 27, The image signal processing section includes a gamma correction section for correcting the intrinsic gradation characteristic in the display section to one of the predetermined basic gradation characteristics in order to be suitable for human visual characteristics, and the basic gradation characteristic. A gradation point adjustment section for adjusting an output gradation value for each of a plurality of adjustment points set according to the input gradation level in The gradation adjustment to the image signal by the image signal processing section is performed by the gradation characteristics obtained by combining the gradation correction in the gamma correction section and the gradation adjustment in the gradation point adjusting section, The image portion selected by the selection cursor and the image portion having an approximately same gradation as the image portion are flickered by the gradation point adjustment section. Image display device. The method of claim 27 or 28, The increase / decrease amount that periodically increases or decreases the output gray value at the adjustment point is an increase or decrease of ± 10% or less at full scale of the output gray value of the gray scale characteristic. Image display device. The method of claim 26, The flashing period of the image portion selected by the selection cursor and the image portion having approximately the same gradation as the image portion is in the range of 0.5 to 3 ms. Image display device. The method of claim 26, In addition, the OSD unit superimposes a graph adjustment screen including a graph smaller than the image representing the gray scale characteristic of the image on the image signal, and is set according to an input gray level for adjusting the gray scale characteristic on the graph adjustment screen. Among the plurality of dot display portions representing the output gradation levels for each of the plurality of adjustment points, the dot display portion corresponding to the selected image portion is flickered or the color tone of the dot display portion is changed. Image display device. The method of claim 26, In addition, the OSD unit superimposes the characteristic confirmation screen, which is a graph smaller than the image indicating the gradation characteristic of the image, on the image signal, and a plurality of adjustment points set according to the input gradation level of the gradation characteristic on the characteristic confirmation screen. Among the plurality of dot display units representing the output gradation level for each, the dot display unit corresponding to the selected image portion is flickered or the color tone of the dot display unit is changed. Image display device. 33. The method of claim 31 or 32, The flickering period of the dot display portion of the graph adjustment screen or the characteristic confirmation screen is synchronized with the flickering period of the image portion selected by the selection cursor. Image display device. The method of claim 27, In the plurality of adjustment points, at least half of the adjustment points of the total adjustment points are distributed in the range of the low gray level to the middle gray level at the input gray level. Image display device. The method of claim 31, wherein The graph adjustment screen includes a plus button and a minus button for increasing or decreasing the gradation value by one step, with a predetermined output gradation amount determined for each selected adjustment point as one step, The predetermined output gradation amount is set so that the adjustment point of the low gradation region is larger than the adjustment point of the high gradation region. Image display device. 33. The method of claim 32, If the operation unit determines an operation of determining the selected adjustment point of the characteristic confirmation screen, the OSD unit stops overlapping of the characteristic confirmation screen and displays a gradation adjustment screen for adjusting the output gradation level of the selected adjustment point. Superimposed on the image signal, The gradation adjustment screen includes a plus button and a minus button for increasing or decreasing the gradation value by one step, with a predetermined output gradation amount determined for each of the selected adjustment points as one step, The predetermined output gradation amount is set so that the adjustment point of the low gradation region is larger than the adjustment point of the high gradation region. Image display device. delete delete delete

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