JP2005045769A - Image display device and image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device such as a projector capable of performing color adjustment according to a display mode for reducing the generation of a color contrast phenomenon. <P>SOLUTION: In the projector for receiving an image signal to display an image, a main microcomputer 70 and a switching control section 56 for determining the boundary position dividing the display screen into a first area and a second area switch the output of an output selector 55 according to the position of a pixel, so that a pixel signal of an image to be displayed in the first area is converted by a color conversion LUT (look-up table) 52 before being outputted while a pixel signal of an image to be displayed in the second area is directly outputted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display mode when color-adjusting an image displayed on a display medium such as a screen or a display by a projector, a DVD player, a personal computer, or the like.

An apparatus for displaying an image on a display medium such as a screen or a display usually includes a color adjustment function for adjusting a color in accordance with a user instruction.
In particular, a projector that enlarges and projects a video signal input in various color schemes onto various types of screens easily changes in display color depending on the combination of the color schemes and screens, and thus a color adjustment function is essential.

As a conventional color adjustment function, there is one disclosed in Patent Document 1.
The image correction apparatus of Patent Document 1 arranges a reference window and a work window side by side on a single display screen, and displays the same image in both windows in a reduced size according to the size of the window. The user can adjust the color of the work window image by operating the mouse while referring to the image of the reference window as the original image.
JP 2002-262218 A

However, in the display mode of Patent Document 1, there is a problem that a color contrast phenomenon easily occurs and color adjustment is difficult.
Here, the contrast phenomenon is a phenomenon in which a certain color is influenced by other colors and looks different from the actual color, and is caused by an illusion of human eyes.
There are several types of contrast phenomena. In the case of the display mode of Patent Document 1, it is particularly easy to cause continuous contrast and area contrast.

Continuation contrast is a phenomenon in which, when one color is viewed after another color is viewed, the complementary color of the first viewed color appears as an afterimage. For example, after seeing white, a black afterimage appears, and after looking red, a green afterimage appears.
In the case of the display mode of Patent Document 1, when the image of the reference window is viewed for a while and then the image of the work window is viewed, the afterimage of the reference window appears to overlap the image of the work window due to continuous comparison. , It becomes difficult to recognize the original color. In addition, the afterimage of the reference window and the image of the work window overlap with each other because the size, outline, shape, etc. of the image are exactly the same, and the afterimage becomes darker by looking at the two windows alternately. Adjustment becomes more difficult.

Area contrast is a phenomenon in which the characteristics of a color appear to increase as the area increases. For example, dark colors appear heavier and light colors appear lighter.
In the case of the display mode of Patent Document 1, the device displays an image to be displayed on the entire display screen.
Since the image is reduced in accordance with the size of the window, the color characteristics of the image appear to be weakened, so that the color cannot be correctly recognized.

  SUMMARY An advantage of some aspects of the invention is that it provides an image display apparatus capable of performing color adjustment by a display mode in which occurrence of a color contrast phenomenon is suppressed.

  An image display device that achieves the object is an image display device that receives an image signal and displays an image, and a determination unit that determines a boundary position for dividing the display surface into a first region and a second region; The image signal applied to the image to be displayed in the first area is specified based on the boundary position, the color attribute in the image signal is converted, and the image is displayed in the first area based on the converted image signal. The first display means to display and the image signal related to the image to be displayed in the second area based on the boundary position are specified, and the color attribute in the image signal is converted based on the image signal Second display means for displaying an image in the first region based on the converted image signal.

In this configuration, the image display apparatus is realized by, for example, a projector that projects an image on a screen.
The determining means corresponds to the processing of the main microcomputer 70 that determines the coordinates of the boundary position at which the display surface projected on the screen is divided into the first area and the second area.
Further, as shown in FIG. 7, the first display means receives the coordinates of the boundary position from the main microcomputer 70, and the switching control unit 56 outputs an image signal to be displayed in the first area based on the coordinates. The timing input to the selector 55 is specified, a switching signal indicating the timing is output to the output selector 55, and the output selector 55 outputs the image signal color-converted by the color conversion LUT 52 according to the timing indicated by the switching signal. , Corresponding to a series of processes.

  Further, as shown in FIG. 7, the second display means receives the coordinates of the boundary position from the main microcomputer 70 when the switching control unit 56 receives an image signal to be displayed in the second area based on the coordinates. The timing input to the output selector 55 is specified, a switching signal indicating the timing is output to the output selector 55, and the output selector 55 outputs the image signal as it is without color conversion in accordance with the timing indicated by the switching signal. This corresponds to a series of processes.

  Alternatively, as shown in FIG. 13, the second display means receives the coordinates of the boundary position from the main microcomputer 70 when the switching control unit 56 receives an image signal to be displayed in the second area based on the coordinates. The timing input to the output selector 55 is specified, a switching signal indicating the timing is output to the output selector 55, and the output selector outputs the image signal color-converted by the color conversion LUT 51 according to the timing indicated by the switching signal. This is equivalent to a series of processing.

  According to this configuration, the image display device divides one displayed image into two regions, displays one image as it is, and displays the other color-converted according to a color designated by the user. Alternatively, the two areas are displayed after color conversion.

With such a display mode, it is possible to suppress the occurrence of the color contrast phenomenon as compared with the conventional display mode in which two identical images are displayed side by side, and the user can recognize and adjust colors accurately. There is an effect that can be done.
The image signal includes a plurality of pixel signals constituting a display surface, and the first display unit stores a color conversion table in which the same value or another value is associated with each of a plurality of values that can be taken by the pixel signal. The table storage means may be provided, and the value of the pixel signal relating to the image to be displayed in the first area may be converted into a corresponding value according to the color conversion table.

  In this configuration, the table storage means corresponds to the color conversion LUT 52 in which each of a plurality of possible values of the pixel signal is associated with the address on a one-to-one basis, and the pixel signal is recorded at each address. Then, the first display means inputs each pixel signal relating to the image to be displayed in the first region to the color conversion LUT 52, and obtains the pixel signal recorded at the address of the pixel signal as the converted pixel signal.

According to this configuration, the image display apparatus can easily realize a color conversion mechanism using a lookup table that stores the color before conversion and the color after conversion in association with each other as the color conversion table. .
Further, the determining means stores a pixel position relating to a boundary position that divides the display surface vertically or horizontally, and the first display means refers to the stored pixel position and outputs a pixel signal The pixel signal related to the image to be displayed in the first area is specified by counting the reception timing of the first signal, and the second display means refers to the stored pixel position and receives the pixel signal. You may comprise so that the pixel signal concerning the image which should be displayed on a 2nd area | region by counting timing may be specified.

In this configuration, the function of the determination means storing the pixel position relating to the boundary position that divides the display surface vertically or horizontally is a latch (switching control) that holds the coordinate value of the boundary position input from the main microcomputer 70. Corresponds to the portion 56).
The first display means refers to the stored pixel position and counts the reception timing of the pixel signal to specify the pixel signal related to the image to be displayed in the first area. A counter that resets when a horizontal synchronization signal or a vertical synchronization signal is input, counts the input pixels, and outputs a switching signal when the value is equal to the value held in the latch at the time of reset (in the switching control unit 56) This corresponds to the function of the selector 55 for switching and outputting the pixel signal input in accordance with the switching signal and the pixel signal after color conversion.

According to this configuration, the display surface is divided into two regions by a simple configuration using a latch that stores the coordinate value of the boundary position and a counter that counts the input clock of the pixel signal. The specified configuration can be realized.
The determination unit may be configured to determine a boundary position based on a user input and store a pixel position related to the determined boundary position.

This configuration corresponds to a function in which the main microcomputer 70 receives a user's operation of the mouse 130 or the remote controller 140 as a user input and determines a boundary position based on a coordinate position or the like indicated by the user input.
According to this configuration, the user can specify the boundary position using an input device such as a mouse or a remote controller.

The determination unit may be configured to receive a user input of information indicating a position on the display surface and determine a boundary position so that the position indicated by the information is included in the first region.
In this configuration, the main microcomputer 70 receives the input of the coordinate position on the display surface by the mouse 130 or the remote controller 140, determines the coordinates in the vicinity thereof as the boundary position, and the area including the input coordinate position is the first area. This corresponds to the process of controlling the color conversion circuit 40 using the other area as the second area.

According to this configuration, since the position designated by the user is included in the first area to be color-converted, the user can specify the location to be color-converted by operating the mouse.
The determination unit may be configured to receive a user input of information indicating a position on the display surface and determine the position indicated by the information as a boundary position.
This configuration corresponds to a process in which the main microcomputer 70 receives a coordinate position on the display surface from the mouse 130 or the remote controller 140 and determines the coordinate position itself as a boundary position.

According to this configuration, the user can point to a position on the display surface by a mouse operation or the like, and the position can be set as a boundary position.
In addition, the determination unit is configured to receive a user input of information indicating a position on the display surface and determine a position that is a predetermined number of pixels away from a pixel position corresponding to the position indicated by the information as a boundary position. Also good.

In this configuration, the main microcomputer 70 receives an input of the coordinate position on the display surface by the mouse 130 or the remote controller 140, and determines, for example, a position where the x coordinate of the coordinate position is moved to the left by 50 pixels as the boundary position. It corresponds to processing.
According to this configuration, the distance between the position designated by the mouse operation or the like and the boundary position can be set to a predetermined distance.

The image display device may further include a changing unit that changes the content of the color conversion table based on a user input indicating an instruction to change the content of the color conversion table.
Further, the changing unit specifies the value of the pixel signal to be converted and the value of the pixel signal after conversion based on a user input, and updates the contents of the color conversion table with the values of the two specified pixel signals. You may comprise.

In this configuration, the main microcomputer 70 acquires the color value of the adjustment color palette 3 and the color value of the target color palette 5 input by the user through the color adjustment screen of FIG. 9 or FIG. This corresponds to the process of writing the color value of the target color palette 5 in the address portion corresponding to the color value of the adjustment color palette 3 in FIG.
According to this configuration, the user can instruct and change the contents of the color conversion table.

Further, the change unit may receive a user input of information indicating a position on the display surface and specify a value of a pixel signal at a position indicated by the information as a value of the pixel signal to be converted.
In this configuration, the capture position control unit 58 acquires the value of the color signal at the coordinate position specified by the main microcomputer 70 that has received user input from the signals input to the color conversion circuit 40, and This is equivalent to a series of processes in which the main microcomputer 70 determines the color signal value returned from the capture position control unit 58 as the color to be changed.

  According to this configuration, the user can designate a color to be changed by selecting a pixel on the displayed image by operating a mouse or the like.

Hereinafter, embodiments of the present invention will be described.
<Overview>
FIG. 1 is a diagram showing a usage form of a projector according to an embodiment of the present invention.
In the figure, a projector 100 internally processes a video signal from a personal computer 150 connected to an input terminal, develops it on a liquid crystal panel, and displays it on a screen 160 in an enlarged manner. When an instruction is given to perform color adjustment by operating the user's mouse 130 during display, the projector 100 divides the image displayed on the screen 160 into two left and right areas, and one area remains in the original color. The other area is color-converted according to the color designated by the user and displayed.

FIG. 2 shows an example of a display mode at the time of color adjustment.
When the user moves the mouse 130 while the image is displayed, a cursor is displayed on the image as shown in FIG. When the cursor is moved by a mouse operation and left-clicked at an appropriate position, as shown in FIG. 2B, a boundary line 2 that divides the image into two left and right regions is displayed, and a color adjustment screen is displayed. . This color adjustment screen is a screen for the user to input an instruction for color adjustment, and is configured so that the color to be color adjusted and the color after adjustment can be input by a mouse operation. When color adjustment is instructed from this screen, as shown in FIG. 2C, the area on the right side of the boundary line is displayed by changing the color portion specified as the adjustment target to the specified color, The area on the left side of the boundary line is displayed in its original color. When the mouse 130 left-clicks on the right area and inputs an instruction to approve the color change, as shown in FIG. 2D, the entire screen is color-converted based on the indicated color and displayed. Is done.

  The boundary line displayed on the screen of FIG. 2C can be moved by dragging the mouse as shown in FIG. 3A, and the original color is displayed according to the movement of the boundary position. The area and the area for displaying the converted color also change. If the cursor is placed on the boundary line and left-clicked, the vertical boundary line becomes a horizontal boundary line as shown in FIG. 3B, and the original color display area and the converted color display area are displayed. Displayed vertically. Also in this case, the boundary position can be changed by dragging the mouse.

Furthermore, as shown in FIG. 4A or 4B, the area for displaying the original color and the area for displaying the color after conversion can be switched.
<Configuration>
Now, a configuration for realizing such a display mode will be described below.
FIG. 5 shows an external view of the projector 100.

The projector 100 includes, as input terminals, a USB connection terminal 14, a video input terminal 11, an S video input terminal 12, and an RGB / YPbPr input terminal 13 to which a mouse 130 is connected on one side of the casing. Remote control light receiving unit 170 and lens 190 for inputting the above signal, and direction key 120 and determination button 110 are provided on the upper surface of the housing.
FIG. 6 is a block diagram showing the configuration of the projector 100.

  The projector 100 includes a color conversion circuit 40, an on-screen processing circuit 50, a main microcomputer 70, and an external interface 71 as main parts of the invention. The front stage of the color conversion circuit 40 is provided with a part for preprocessing various input video signals, and the rear part of the on-screen processing circuit 50 is a processing part for developing the video signals on the liquid crystal panel for display. Is provided.

Below, the structure of a front | former stage part and a back | latter stage part is demonstrated easily first, and the principal part is demonstrated later.
The configuration of the previous stage is composed of a video input terminal 11, S video input terminal 12, RGB / YPbPr input terminal 13, color decoder 22, Y / C separation circuit 23, matrix circuit 24, A / D converter 30, resizing circuit 35, input It consists of selectors 21, 25 and 26.

  The video terminal 11, the S video input terminal 12, and the RGB / YPbPr input terminal 13 respectively input a terminal for inputting an NTSC composite video signal, a terminal for inputting an S video signal, and an RGB signal or a YPbPr signal. It is a terminal to do. Signals input from these terminals are processed by the color decoder 22, Y / C separation circuit 23, and matrix circuit 24 in accordance with the type of video signal standard of the signals, converted into RGB signals, and then converted into A signals. / D is input to the converter 30.

The color decoder 22 is a decoder for color-decoding a Y / C separated signal or an inputted Y / C signal into a YPbPr signal.
The Y / C separation circuit 23 is a circuit for separating the composite video signal input by the color decoder 22 into a Y signal and a C signal.
The matrix circuit 24 is a circuit that reproduces an RGB signal by applying a predetermined process of the prior art to the YPbPr signal input from the YPbPr terminal.

The A / D converter 30 is a converter for converting the analog signal selected by the input selector 26 into a 10-bit digital signal.
The resizing circuit 35 is a circuit for resizing the digital signal according to the number of pixels of the LCD panels 91 to 93. The resizing circuit 35 temporarily stores the resized video signal in the internal memory, and outputs it to the color conversion circuit 40 in the scanning order while synchronizing with the synchronizing signal from the input selector 26. Also, if there is a freeze instruction from the main microcomputer 70, the updating of the internal memory is stopped, that is, the one frame of video signal accumulated when the instruction is given is kept, and it is determined by the video signal of the next frame. Then, the video signal held in the internal memory is repeatedly output to the color conversion circuit 40 in accordance with the frame frequency.

The configuration of the rear stage portion is composed of digital phase expansion circuits 81, 82, 83, a panel driving IC 90, and LCD panels 91, 92, 93.
The digital phase expansion circuits 81 to 83 are circuits for phase expansion of the digital signal color-corrected by the color conversion circuit 40 in consideration of the operation speed of the drive drivers (not shown) of the LCD panels 91 to 93.

A panel driving IC (Integrated Circuit) 90 is a circuit for driving the LCD panels 91 to 93.
The LCD panels 91 to 93 are panels for color-displaying digital signals color-corrected by the color conversion circuit 40 and phase-developed by the digital phase development circuits 81 to 83.
Next, the configuration of the main part will be described.

Based on the boundary position instructed by the main microcomputer 70, the color conversion circuit 40 identifies to which of the two areas the video signal for one frame output from the resizing circuit 35 belongs, and The video signal is output as it is, and the video signal in the other area is color-converted according to the color designated by the main microcomputer 70 and output.
FIG. 7 is a block diagram showing a configuration of the color conversion circuit 40.

In the figure, the color conversion circuit 40 includes a color conversion LUT (Look Up Table) 52, an output selector 55, a capture position control unit 58, and a switching control unit 56.
The color conversion LUT 52 associates each value of all the color signals that can be input with each address of the internal memory, and holds the value of the color signal to be output to each address. When one color signal is input, the color conversion LUT 52 outputs a color signal held at an address corresponding to the color signal.

In each address, a color signal having the same value as the input color signal is held as an initial value, and the contents of the address are rewritten later by a write operation by the main microcomputer 70 accompanying color adjustment.
When the coordinates of the boundary position of the two-divided display are instructed from the main microcomputer 70, the switching control unit 56 stores and holds the coordinates, and outputs an appropriate switching signal to the output selector 55 to perform switching.

FIG. 8 is a block diagram illustrating a configuration of the switching control unit 56.
In the figure, the switching control unit 56 mainly includes a latch and a counter.
The latch holds the coordinates of the boundary position input from the main microcomputer 70.
The counter detects the boundary between the two areas by counting the timing when one pixel or one line of the video signal is input to the color conversion circuit 40, and outputs a carry-out, that is, a switching signal to the output selector 55 at the time of detection. To do.

More specifically, the switching control unit 56 operates differently when the image is divided into left and right as shown in FIG. 3A and when the image is divided vertically as shown in FIG.
When the image is divided into left and right, first, the switching control unit 56 receives an instruction to divide it left and right from the main microcomputer 70 and the input of the x coordinate of the boundary position, and holds the x coordinate in the latch. The counter counts up the input clock while resetting the counter value each time the horizontal synchronization signal is input. This clock is generated by the main microcomputer 70 based on the horizontal synchronizing signal, or is generated by the resizing circuit 35, and corresponds to the timing of one pixel of the video signal to which one clock is input. The counter outputs a switching signal when reset by the horizontal synchronization signal and when the counted up value becomes the same value as the x coordinate held in the latch.

  When the image is divided vertically, the switching control unit 56 receives an instruction to divide the image vertically from the main microcomputer 70 and the input y coordinate of the boundary position, and holds the y coordinate in the latch. The counter counts up the input horizontal synchronization signal while resetting the counter value each time the vertical synchronization signal is input. The counter outputs a switching signal when reset by the vertical synchronization signal and when the counted up value becomes the same value as the y coordinate held in the latch.

55 outputs either the color signal input from the resizing circuit 35 or the color signal from the color conversion LUT 52 to the on-screen processing circuit 50 in accordance with the switching signal from the switching control unit 56.
More specifically, when the image is divided into right and left, the output selector 55 outputs the color signal input from the resizing circuit 35 as it is when the switching signal by reset is input from the switching control unit 56, and the latch and counter When the switching signal due to the same value is input, the color signal from the color conversion LUT 52 is output.

When the image is divided into upper and lower parts, the output selector 55 outputs the color signal input from the resizing circuit 35 as it is when the switching signal from the switching control unit 56 is input, and the values of the latch and the counter are set. When a switching signal resulting from the same value is input, the color signal from the color conversion LUT 52 is output.
Further, when the main microcomputer 70 gives an instruction to switch left and right as shown in FIGS. 4A and 4B by a mouse operation or the like, the output selector 55 reverses the output switching. This is the same when the top and bottom are switched.

The capture position control unit 58 obtains the value of the color signal at the coordinate position designated by the main microcomputer 70 from the signals input to the color conversion circuit 40 and returns it to the main microcomputer 70. The coordinate position designated by the main microcomputer 70 corresponds to an image portion designated by the user by a mouse operation and subjected to color adjustment.
Specifically, the capture position control unit 58 includes a horizontal synchronization signal counter and a pixel clock counter, and specifies a coordinate position specified by the main microcomputer 70, and acquires a color signal at the specified position. Output to the main microcomputer 70.

  With this configuration, for example, when left-clicked, the main microcomputer 70 that has received the input from the external interface 71 notifies the capture position control unit 58 of the coordinates included in the 20 pixel squares centered on the cursor position. Then, the capture position control unit specifies the positions of the 20 pixels in all directions by the counts of the horizontal synchronization signal counter and the pixel clock counter, acquires the color signals included therein, and outputs them to the main microcomputer 70.

The on-screen processing circuit 50 is a circuit that generates an image for on-screen display based on an instruction from the main microcomputer 70, and synthesizes this and the image of the video signal output from the color conversion circuit 40. . In the present invention, the image for on-screen display is a color adjustment image and a boundary line for color adjustment.
FIG. 9 shows an example of a color adjustment image and boundary lines that are displayed on-screen by the on-screen processing circuit 50.

In the figure, an adjustment color palette 3 indicates colors to be subjected to color adjustment.
The adjustment color designating unit 4 indicates color candidates to be subjected to color adjustment, and the color palettes 401 to 406 have a large number of color signals in the 20 pixels square obtained by the capture position control unit 58. The top six colors are shown.
The target color palette 5 indicates what color the color displayed in the adjustment color palette 3 is changed to after conversion.

The target color designating means 6 is for adjusting the color displayed on the target color palette 5. The color is separated into hue, color intensity and brightness, and these are designated scales 601, 602 and 603. Show.
Here, the boundary line 2 is displayed in thickness, brightness, and saturation as follows. First, when the screen size is SXGA (1280 pixels × 1024 pixels), the thickness is preferably 1% or less. For example, when the screen is divided into left and right, the thickness is 1% of 1280 pixels, that is, 12 pixels or less. In addition, it is desirable that the saturation is achromatic and the brightness is variable, but if it is not variable, it is desirable to display at a brightness of 20 to 40% of the luminance of 100% white. This is because human vision recognizes the boundary line as one of the images and is thought to adversely affect the recognition of the color of the entire image. Therefore, an attempt is made to reduce the influence of the boundary line as much as possible.

The external interface 71 is input from various user operation units, that is, input from the mouse 130 connected to the USB connection terminal 14, signal from the remote control 140 input to the remote control light receiving unit 170, direction key 120, determination button 110. This is an interface for transmitting to the main microcomputer 70 the depression of.
The main microcomputer 70 performs all control of the entire apparatus such as power supply control, fan control, temperature control, input switching control, and in particular, a resizing circuit according to a user's mouse operation input through the external interface 71 during color adjustment. 35, various instructions are given to the color conversion circuit 40, the on-screen processing circuit 50, etc., and processing related to color adjustment is controlled.

Hereinafter, processing relating to color adjustment of the main microcomputer 70 will be listed.
(1) When the mouse 130 is moved, the direction key of the remote controller 140 is pressed, or the direction key 120 is pressed while the video is displayed, the main microcomputer 70 outputs a signal corresponding to the signal. When input from the external interface 71, the on-screen processing circuit 50 is instructed to display a cursor.

To display the cursor, the main microcomputer 70 transmits to the on-screen processing circuit 50 an instruction to synthesize the cursor image and the image of the video signal, and the position coordinates of the position where the cursor is to be displayed. The on-screen processing circuit synthesizes the cursor image on the position coordinates of the image of the video signal accordingly.
(2) Following this cursor display, if there is a left click of the mouse 130, pressing of the enter button on the remote controller 140 or press of the enter button 110 while the cursor is displayed, the main microcomputer 70 freezes the image in the resizing circuit 35. Instruct them to do so. In response to this instruction, the resizing circuit 35 interrupts resizing of the video signal of the next frame, and repeatedly outputs the video signal for one frame held in the internal memory to the color conversion circuit 40.

  (3) Subsequently, the main microcomputer 70 instructs the on-screen processing circuit 50 to display a boundary line. More specifically, the main microcomputer 70 acquires the position coordinates of the cursor when the left click or the determination button is pressed, and divides the image display surface displayed on the screen 160 into two areas based on the position coordinates. The boundary position to be determined is determined. Then, the on-screen processing circuit 50 is notified of the position coordinates of the determined boundary position and an instruction to synthesize the image representing the boundary line with the image of the video signal. Then, the on-screen processing circuit displays a vertical boundary line at the coordinates of the specified boundary position. Here, in the present embodiment, the main microcomputer 70 determines the position coordinates in the vicinity thereof as the boundary position based on the position coordinates of the cursor. The position coordinates in the vicinity of the cursor position coordinates are, for example, position coordinates that are 50 pixels to the left of the cursor position coordinates.

  In short, in this case, the coordinate position of the cursor or an image in the vicinity thereof is set as a color adjustment target so that they are included in the region on the right side of the boundary line. In addition, the distance between the cursor position coordinates and the boundary line coordinates is set to about 50 pixels so that the color adjustment target part and the boundary line are not too far apart from each other. The part displayed in the original color on the left side is made easy for humans to see and compare.

(4) Further, the main microcomputer 70 instructs the on-screen processing circuit 50 to display a color adjustment screen.
More specifically, the main microcomputer 70 transmits to the on-screen processing circuit 50 an instruction to synthesize the image of the color adjustment screen and the image of the video signal and information about the configuration content of the color adjustment screen. .

Here, the information about the configuration content is the color displayed on the color adjustment palette 3, the adjustment color designation unit 4 and the target color palette 5, and the position of the indicator of each scale displayed on the target color designation unit 6. .
The main microcomputer 70 determines the initial value of the information about the configuration contents as follows and transmits it to the on-screen processing circuit 50.

  That is, when the left microcomputer or the determination button is pressed, the main microcomputer 70 acquires a color value of 20 pixels square centered on the cursor position, that is, a color value of 400 pixels from the capture position control unit 58. . Then, the most common color among the 400 pixels is set as the initial color of the adjustment color palette 3 and the target color palette 5. In addition, the six colors including the initial color in the descending order are set as the colors of the color palettes 401 to 406 of the adjustment meal designation means. Further, values obtained by separating the color of the adjustment color palette 3 into hue, color density, and brightness are calculated, and the positions of the indicators of the designated scales 601, 602, 603 of the target color designating unit 6 are calculated according to these values. Decide.

(5) The main microcomputer 70 instructs the on-screen processing circuit 50 in accordance with a mouse operation performed on the color adjustment screen, and updates the configuration content of the color adjustment screen.
More specifically, each time one of the color palettes 401 to 406 is selected by a mouse operation or the like, the on-screen processing circuit 50 is instructed to change the color of the adjustment color palette 3 to the color of the selected color palette. The indicators of the designated scales 601 to 603 of the target color designating unit 6 indicate the updated color of the adjustment color palette 3.

When the position of the indicator of the designated scales 601 to 603 is moved by a mouse operation or the like, a color value is calculated according to the position of the indicator after the movement, and the calculated color is displayed on the target color palette 5.
(6) When the color adjustment screen is displayed and left-clicked with the cursor placed on an image portion other than the screen, the main microcomputer 70 instructs the color conversion circuit 40 to The area on the right side of the boundary line is converted to the color specified on the color adjustment screen. More specifically, the main microcomputer 70 acquires the color value of the adjustment color palette 3 and the color value of the target color palette 5, and an address corresponding to the color value of the adjustment color palette 3 in the color conversion LUT 52. The color value of the target color palette 5 is written in Further, the main microcomputer 70 transmits the coordinates of the boundary line to the switching control unit 56 and instructs to perform switching.

In response to this, the color conversion circuit 40 outputs the video signal on the left side of the boundary line as it is, switches the selector 55 when it reaches the boundary line, and the video signal on the right side of the boundary line is converted by the color conversion LUT 52. Output video signal.
(7) In the state where the video signal on the right side of the boundary line is displayed after color conversion, when the image portion other than the color adjustment screen is left-clicked again, the main microcomputer 70 controls the switching of the color conversion circuit 40. The unit 56 is instructed to output all video signals of one frame through the color conversion LUT 52.

As a result, the entire image of one frame is color-converted and displayed.
<Operation>
The operation of the projector 100 configured as described above will be described below.
FIG. 11 is a flowchart showing the operation of the projector 100.
When the mouse 130 is moved while an image is displayed as shown in FIG. 1, the main microcomputer 70 instructs the on-screen processing circuit 50 to display a cursor as shown in FIG. 2A (step S111). ).

The main microcomputer 70 instructs the display position of the cursor to the on-screen processing circuit 50 so that the cursor is moved according to the movement of the mouse 130 (step S112).
When the mouse 130 is left-clicked, the main microcomputer 70 obtains the coordinates of the display position of the cursor at that time, determines the boundary position based on the coordinates, and displays an instruction to generate the boundary position and the boundary line on-screen. This is transmitted to the processing circuit 50. More specifically, the main microcomputer 70 determines the x coordinate at a position 50 pixels to the left of the cursor display position as the boundary position, and gives the x coordinate and an instruction to generate a vertical boundary line. This is transmitted to the on-screen processing circuit 50 (step S113).

  At this time, the main microcomputer 70 transmits the coordinates of the 20 pixels in the center with the coordinates of the acquired cursor display position to the capturing position control unit 58 and acquires the color signal of each coordinate from the capturing position control unit 58. Then, the configuration content of the color adjustment screen is determined based on the acquired color signal, and information about the configuration content is transmitted to the on-screen processing circuit 50 to generate the color adjustment screen.

Almost simultaneously with the processing in step S113, the main microcomputer 70 instructs the resizing circuit 35 to freeze the image (step S114).
In response to these instructions, the resizing circuit 35 freezes the image by repeatedly outputting the image of one frame stored in the internal memory. The on-screen processing circuit 50 combines the vertical boundary line and the color adjustment screen with the image from the resizing circuit 35 and outputs the combined image. As a result, a display as shown in FIG. 2C is obtained (step S115).

In response to the operation of the mouse 130 on the color adjustment screen, the main microcomputer 70 causes the on-screen processing circuit 50 to update the configuration content of the color adjustment screen (step S116).
When an image portion other than the color adjustment screen is left-clicked, the main microcomputer 70 updates the content of the color conversion LUT 52 according to the content of the color adjustment screen, and causes the switching control unit 56 to perform switching control. As a result, the color conversion circuit 40 outputs the video signal on the left side of the boundary line as it is, switches the output selector 55 when it reaches the boundary line, and the video signal on the right side of the boundary line is converted by the color conversion LUT 52. A video signal is output (step S117).

  When the color adjustment screen is operated with the mouse in the state of being divided into two in this way, the process returns to step S116 and the process is repeated. Alternatively, when an image other than the color adjustment screen is left-clicked, the main microcomputer 70 regards the end of the color adjustment, causes the on-screen processing circuit 50 to finish combining the boundary line and the color adjustment screen, and switch The controller 56 is instructed to output all the video signals of one frame through the color conversion LUT 52, and the rewritten portion of the color conversion LUT 52 is color-converted as shown in FIG. It is displayed (step S119).

As described above, the projector 100 according to the present embodiment divides one displayed image into two regions, displays one as it is, and displays the other with color conversion according to a color designated by the user. To do. With such a display mode, it is possible to suppress the occurrence of the color contrast phenomenon and to recognize and adjust the color accurately as compared with the conventional display mode in which two identical images are displayed side by side. effective.
<Other embodiments>
In addition, the present invention is not limited to the above embodiment, and may be implemented as follows.

(1) The image display apparatus of the present invention is not limited to a projector, and any apparatus that displays an image on various display media such as a plasma display, a liquid crystal display, and a CRT may be used.
(2) The switching control unit 56 may have a countdown configuration as shown in FIG. In other words, the coordinates of the boundary line are held in the latch by the main microcomputer 70, and when the horizontal synchronization signal is input, the counter sets the value held in the latch and repeats the countdown (step S122). When becomes 0, a switching signal is output (step S124).

(3) The adjustment color designation unit 4 may display a fixed color such as red, green, blue, yellow, cyan, magenta, for example, instead of displaying the color acquired by the capture position control unit 58. . Further, these colors may be represented by characters such as R, G, B, Y, C, and M instead of colors.
(4) The color adjustment color designation means 4 and the target color designation means 6 on the color adjustment screen may be represented by an xy chromaticity diagram as shown in FIG.

  In the figure, reference numeral 431 denotes an xy chromaticity diagram of the color adjustment color designating unit 4, and 434 denotes color coordinates representing the color to be adjusted, which correspond to colors displayed on the adjustment color palette 3. On the left side and the lower side of the xy chromaticity diagram, there are an x coordinate designation scale 433, a y coordinate designation scale 432, and a brightness designation scale 437. When these indicators are moved by a mouse operation or the like, they are linked. As a result, the coordinate of the color coordinate 434 is changed, whereby the color to be adjusted can be changed. The color coordinates 434 may be directly moved by a mouse operation.

Further, 436 and 438 below indicate a color coordinate value and a brightness value, respectively, and the values change in conjunction with the indicators of the respective scales. The color coordinates may be designated by directly inputting a value in this portion.
The same applies to the target color designation means 6. That is, 631 is an xy chromaticity diagram of the target color designating unit 6, and 635 is a color coordinate representing a target color after adjustment, which corresponds to a color displayed on the target color palette 5. On the left and lower sides of the xy chromaticity diagram, there are an x-coordinate designation scale 633, a y-coordinate designation scale 632, and a brightness designation scale 637. When these indicators are moved by a mouse operation or the like, they are linked. As a result, the coordinate of the color coordinate 635 is changed, whereby the color after adjustment can be changed. The color coordinates 635 may be directly moved by a mouse operation.

Further, 636 and 638 below indicate a color coordinate value and a brightness value, respectively, and the values change in conjunction with the indicators of the respective scales. The color coordinates may be designated by directly inputting a value in this portion.
(5) Of the components of the adjustment color designating unit 4 of (4) above, any one of the components may be removed. For example, it may be configured without 436 and 438, or may be configured with only various scales except for the xy chromaticity diagram.

The same applies to the target color designation means 6.
(6) The configuration contents of the color adjustment screens in FIGS. 9 and 10 may be combined.
(7) The configuration of the color conversion circuit 40 may be as shown in FIG.
This figure is obtained by adding a color conversion LUT 51 to the block diagram of FIG.
The color conversion LUT 51 holds in advance color signals that can perform faithful color reproduction according to characteristics such as voltage and transmittance of the LCD panels 91 to 93 at the address of the input color signal. The color conversion LUT 52 initially holds the same content as the color conversion LUT 51 as an initial value, and then the content is updated by the main microcomputer 70.

Other configurations are the same as those in FIG.
With this configuration, in a state before color adjustment, the color signal converted by the color conversion LUT 51 is output, and after the color adjustment is performed and the screen is divided into two, the signal of the color conversion LUT 51 and the color conversion LUT 52 Are alternately switched and output.
(8) In the configuration of FIG. 13, the main microcomputer 70 may alternately update the color signals for the color conversion LUT 51 and the color conversion LUT 52. Specifically, the main microcomputer 70 updates the color signal by the first color adjustment to the color conversion LUT 52, updates the color signal by the next color adjustment to the color conversion LUT 51, and then The color signal is updated by color adjustment, and the color conversion LUT 52 is updated.

With this configuration, it is possible to perform further color adjustment on the image after color adjustment.
(9) As shown in FIG. 13, the main microcomputer 70 records the update history of the color conversion LUTs 51 and 52 in the memory 53, and returns the contents of the color conversion LUTs 51 and 52 to the past history by operating the mouse or the like. In response to this operation, the history is read from the memory 53 and written in the color conversion LUTs 51 and 52. By doing so, the color of the image can be returned to the past state.

(10) In FIG. 7, an arithmetic unit may be provided instead of the color conversion LUT 52.
The calculation unit includes a circuit that performs a 3 × 3 matrix calculation on the RGB values of the color signal and a circuit that amplifies the gain of the matrix-calculated signal. The matrix coefficient and the gain coefficient are set by the main microcomputer 70. The matrix coefficient is a value that approximates the target color signal specified on the color adjustment screen.

(11) The color conversion LUT 52 may be 8 × 8 × 8 bits, or may be configured to be 5 × 5 × 5 bits to reduce the memory capacity, and the remaining bits are interpolated by an interpolation circuit. .
(12) The processing of each component shown in FIGS. 6, 7, 8 and 13 may be realized by a program executable by a computer.

(13) In the cursor display and the boundary line display, the on-screen processing circuit 50 displays and combines the images, but the boundary is displayed by the cursor display corresponding to the capture position in the color conversion circuit 40 or by the control from the main microcomputer 70. Lines may be displayed and combined.
(14) In the color conversion circuit 40, the switching control unit 56 and the output selector 55 are arranged at the subsequent stage of the color conversion LUT. However, the input selector is used instead of the output selector 55 and is arranged at the preceding stage of the color conversion LUT. May be. That is, when a color signal is input from the resizing circuit 35, the input selector outputs the color signal as it is to the on-screen processing circuit 50 or inputs it to the color conversion LUT 52 according to the switching signal of the switching control unit 56. Switch what to do. The color conversion LUT 52 performs color conversion on only the color signal input by the input selector and outputs the color signal to the on-screen processing circuit 50.

  The present invention can be used for a device that displays an image on a display unit, such as a projector, a television, a DVD player, or a personal computer.

It is a figure which shows the utilization form of the projector which is one Embodiment of this invention. An example of the display mode at the time of color adjustment is shown. It is a figure which shows the variation of a boundary line. It is a figure which shows the other variation of a boundary line. 1 shows an external view of a projector 100. FIG. 2 is a block diagram showing a configuration of a projector 100. FIG. 2 is a block diagram showing a configuration of a color conversion circuit 40. FIG. 3 is a block diagram showing a configuration of a switching control unit 56. FIG. An example of the color adjustment image and the boundary line displayed on-screen by the on-screen processing circuit 50 is shown. It is a figure showing the variation of the color adjustment color designation | designated means 4 and the target color designation | designated means 6. 4 is a flowchart showing the operation of the projector 100. 10 is a flowchart showing a variation of the switching control unit 56. 6 is a block diagram showing a variation of the color conversion circuit 40. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Video input terminal 12 S video input terminal 13 RGB / YPbPr input terminal 14 USB connection terminal 21, 25, 26 Input selector 22 Color decoder 23 Y / C separation circuit 24 Matrix circuit 30 A / D converter 35 Resizing circuit 40 Color conversion circuit 50 On-screen processing circuit 51 Color conversion LUT
52 color conversion LUT
53 Memory 55 Output Selector 56 Switching Control Unit 58 Capture Position Control Unit 60 On-Screen Processing Circuit 70 Main Microcomputer 71 External Interface 81-83 Digital Phase Expansion Circuit 90 Panel Drive IC
91-93 LCD panel 100 Projector

Claims (11)

An image display device that receives an image signal and displays an image,
Determining means for determining a boundary position for dividing the display surface into the first region and the second region;
An image signal related to an image to be displayed in the first area is specified based on the boundary position, a color attribute in the image signal is converted, and an image is displayed in the first area based on the converted image signal First display means for
An image signal related to an image to be displayed in the second region is specified based on the boundary position, and based on the image signal after conversion based on the image signal or by converting a color attribute in the image signal An image display device comprising: second display means for displaying an image in the first area. The image signal is composed of a plurality of pixel signals constituting a display surface,
The first display means includes table storage means for storing a color conversion table in which the same value or another value is associated with each other for a plurality of values that can be taken by the pixel signal,
The image display device according to claim 1, wherein a value of a pixel signal applied to an image to be displayed in the first area is converted into a corresponding value according to the color conversion table. The determining means stores a pixel position related to a boundary position that divides the display surface vertically or horizontally,
The first display means refers to the stored pixel position and identifies a pixel signal related to an image to be displayed in the first area by counting the timing of reception of the pixel signal;
The second display means refers to the stored pixel position, and identifies a pixel signal related to an image to be displayed in the second area by counting the timing of reception of the pixel signal. The image display device according to claim 2. The determining means includes
The image display device according to claim 3, wherein a boundary position is determined based on a user input, and a pixel position related to the determined boundary position is stored. The determination unit receives a user input of information indicating a position on a display surface, and determines a boundary position so that the position indicated by the information is included in the first region. Image display device. The image display device according to claim 4, wherein the determination unit receives a user input of information indicating a position on a display surface and determines the position indicated by the information as a boundary position. The determination unit receives a user input of information indicating a position on a display surface, and determines a position separated by a predetermined number of pixels from a pixel position corresponding to the position indicated by the information as a boundary position. Item 5. The image display device according to Item 4. The image display device further includes:
The image display apparatus according to claim 2, further comprising a changing unit that changes the content of the color conversion table based on a user input indicating an instruction to change the content of the color conversion table. The changing unit specifies a value of a pixel signal to be converted and a value of a pixel signal after conversion based on a user input, and updates the contents of the color conversion table with the values of the two specified pixel signals. The image display device according to claim 8. The change means receives a user input of information indicating a position on a display surface, and specifies a value of a pixel signal at a position indicated by the information as a value of the pixel signal to be converted. 9. The image display device according to 9. An image display method for receiving an image signal and displaying an image,
A determination step for determining a boundary position for dividing the display surface into the first region and the second region;
An image signal related to an image to be displayed in the first area is specified based on the boundary position, a color attribute in the image signal is converted, and an image is displayed in the first area based on the converted image signal A first display step,
An image signal related to an image to be displayed in the second region is specified based on the boundary position, and based on the image signal after conversion based on the image signal or by converting a color attribute in the image signal A second display step of displaying an image in the second area.

Images