JP2009116192A - Image display device and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device capable of improving operability of a person who makes image quality adjustments and easiness of confirmation of adjustment effects, and a control method thereof and the like. <P>SOLUTION: A difference calculation unit 107 calculates average values of differences in luminance between an input image signal 111 and an image signal output from an image quality adjustment unit 106 for display candidate areas. An OSD display area determination unit 108 determines an area where an OSD image is to be displayed among the plurality of display candidate areas on the basis of the average value of the differences in luminance for the display candidate areas output from the difference calculation unit 107 when an image quality adjustment value monitor unit 104 detects variation in pixel adjustment value. An image synthesis unit 109 synthesizes the OSD image generated by an OSD image generation unit 105 together such that the OSD image is superimposed on the image generated from the image signal output from the image quality adjustment unit 106 in the area determined by the OSD display area determination unit 108 in the image. A display unit 110 generates an image on the basis of the image signal output from the image synthesis unit 109 and displays the image. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image display apparatus capable of adjusting image quality using an on-screen display (OSD), a control method thereof, and the like.

  In recent years, as a display, when adjusting the image quality of a displayed image, an image quality adjustment menu is displayed on the image so that the user can select an adjustment item included in the menu. It has become. An example of such a conventional display screen is shown in FIG.

  However, in such a conventional display, it is difficult to see the image of the portion overlapping the menu, and it is difficult to confirm the adjustment result of the image quality in this portion. Therefore, this portion is most easily affected by the image quality adjustment, and when it is the most suitable portion for confirming the effect of the image quality adjustment, it is difficult to perform an appropriate image quality adjustment.

  As a first conventional technique for solving such a problem, there is a technique in which the display position of a menu can be changed in accordance with an operation of a cross key or the like of a remote controller by a user (adjuster). Further, as a second conventional technique, there is a technique in which a video is divided into a plurality of areas, luminance variations in the areas are obtained, and the menu is moved to an area with less variations (Patent Document 1). Further, as a third conventional technique, there is a technique in which a video is divided into a plurality of areas, a luminance change amount in a moving image is monitored in the area, and a menu is moved to an area having a small change amount (Patent Document 2).

Japanese Patent No. 3026227 JP-A-2005-242204

  However, in the first prior art, after the adjustment of the image quality is started, the adjuster needs to interrupt the adjustment and manually change the display position. Therefore, an operation other than the image quality adjustment itself is necessary. Hinder.

  In the second prior art, when there are a plurality of regions having the same luminance variation, it is impossible to move the menu appropriately. In addition, since the adjustment effect may be increased in an area where the luminance variation is small, the menu may be displayed at a position where the image quality adjustment is most effective as a result of the menu movement.

  In the third prior art, the adjustment effect may be increased in an area where there is no movement. As a result of the menu movement, the menu may be displayed at a position where the image quality adjustment is most effective.

  It is an object of the present invention to provide an image display apparatus and a control method thereof that can improve the operability of a person who performs image quality adjustment and the ease of confirming the adjustment effect.

  As a result of intensive studies to solve the above problems, the present inventor has come up with various aspects of the invention described below.

  An image display device according to the present invention includes an analysis unit that analyzes an input instruction, a specific image creation unit that creates an on-screen display image based on a result of the analysis by the analysis unit, and an analysis by the analysis unit. Based on the result, image quality adjusting means for adjusting the image quality of the input image, and dividing the input image into a plurality of regions, and pixels of the image before and after adjustment by the image quality adjusting means A calculation unit that calculates a change in value for each region, and a region that synthesizes the on-screen display image from the plurality of regions based on a change in pixel value for each region calculated by the calculation unit. Area determining means for determining the on-screen display image on the area determined by the area determining means. To.

  The control method of the image display device according to the present invention includes an analysis step for analyzing an input instruction, a specific image creation step for creating an on-screen display image based on an analysis result in the analysis step, and the analysis step An image quality adjustment step for adjusting the image quality of the input image based on the result of the analysis, and dividing the input image into a plurality of regions, and before and after the adjustment in the image quality adjustment step A calculation step for calculating a change in the pixel value of the image for each region, and a synthesis of the on-screen display image from the plurality of regions based on the change in the pixel value for each region calculated in the calculation step. An area determination step for determining an area to be performed, and the area determined in the area determination step in the on-screen And having a synthesis step of synthesizing the display image.

  According to the present invention, the display position of the on-screen display image is determined based on the change in the pixel value accompanying the image quality adjustment among the plurality of regions, so that the effect of the image quality adjustment can be easily confirmed. Further, since it is not necessary for the adjuster to indicate the position of the on-screen display image, it is possible to avoid complicated operations.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a functional block diagram showing a system configuration of a display (image display device) according to an embodiment of the present invention. This display comprises an on-screen display (OSD).

  As shown in FIG. 1, the display includes an instruction receiving unit 101, an input instruction analyzing unit 102, an image quality adjustment value determining unit 103, an image quality adjustment value monitoring unit 104, and an OSD image creating unit 105. . Furthermore, an image quality adjustment unit 106, a difference calculation unit 107, an OSD display area determination unit 108, an image composition unit 109, and a display unit 110 are also provided.

  The instruction receiving unit 101 is an infrared detection interface, for example, and receives an input instruction from a remote controller. The input instruction analysis unit 102 analyzes the input instruction received by the instruction receiving unit 101 as an analysis unit. The image quality adjustment value determining unit 103 determines an image quality adjustment value used for image quality adjustment based on the instruction when the input instruction includes an item related to image quality adjustment as the image quality adjustment value determining means. The image quality adjustment value monitoring unit 104 detects whether or not the image quality adjustment value determined by the image quality adjustment value determination unit 103 has changed from the nearest one as monitoring means. The OSD image creation unit 105 creates a menu reflecting the current image quality adjustment value as an OSD image based on this instruction when the input instruction includes an item related to image quality adjustment as the specific image creation unit. . When the image quality adjustment value monitoring unit 104 detects a change in the image quality adjustment value, the OSD image creation unit 105 updates the content of the menu to the latest one each time.

  The image quality adjustment unit 106 adjusts the image quality of the image signal 111 input from the outside using the image quality adjustment value determined by the image quality adjustment value determination unit 103 as an image quality adjustment unit. The difference calculation unit 107 divides the input image signal 111 into a plurality of display candidate areas as calculation means, and calculates a difference in pixel value between the input image signal 111 and the image signal output from the image quality adjustment unit 106. An average value is calculated for each display candidate area. Details of this display candidate area will be described later. The OSD display area determining unit 108, when a change in the pixel adjustment value is detected by the image quality adjustment value monitoring unit 104, based on the average value of the luminance difference for each display candidate area output from the difference calculation unit 107. An area for displaying the OSD image is determined from the plurality of display candidate areas. That is, the OSD display area determination unit 108 functions as an area determination unit. The image synthesizing unit 109 is created by the OSD image creating unit 105 in the area determined by the OSD display area determining unit 108 of the image as an image generated from the image signal output from the image quality adjusting unit 106 as a synthesizing unit. The OSD images are synthesized so that the OSD images overlap. When the OSD image creation unit 105 has not created an OSD image, the image composition unit 109 outputs the image signal output from the image quality adjustment unit 106 as it is. The display unit 110 converts the image signal output from the image synthesis unit 109 into an image and displays it.

  Next, the display candidate area will be described. The display candidate area is an area where the OSD image may be displayed, and the size, number, and position thereof are set by the difference calculation unit 107. For example, when an image signal having 8 horizontal pixels, 6 vertical pixels, and 48 total pixels is input, for example, as shown in FIG. 2, the number of horizontal pixels is 4 and the number of vertical pixels is 3 In total, four areas (total number of pixels: 12) are set as display candidate areas A, B, C, and D. Then, one of the four display candidate areas A to D is determined by the OSD display area determination unit 108 as an area for displaying the OSD image.

  Next, calculation of the average value of the luminance difference for each display candidate area by the difference calculation unit 107 will be described. First, for one of the display candidate areas, the difference calculation unit 107 represents the pixels constituting the display candidate area as p11, p12, p13, p14, p21,..., P34 as shown in FIG. . And the difference calculation part 107 calculates | requires the brightness | luminance of each pixel in the image signal 111, and makes these into y11, y12, y13, y14, y21, ..., y34. Further, the difference calculation unit 107 obtains the luminance of each pixel in the image signal output from the image quality adjustment unit 106, and obtains these values by y′11, y′12, y′13, y′14, y′21,. -Y'34. Next, the difference calculation unit 107 obtains an average value of luminance differences before and after image quality adjustment for each pixel. That is, the difference calculation unit 107 performs an operation of “(y11−y′11) + (y12−y′12) +... + (Y34−y′34)} / 12”. This process is performed for other display candidate regions. As a result, the average value of the luminance difference for each display candidate area before and after the image quality adjustment is calculated.

  It is not necessary to always use all the pixels in the display candidate area in calculating the average value of the luminance difference in the display candidate area. A plurality of representative points are set in advance, and the average of the luminance difference in these representative points is set. A value may be calculated.

  In this embodiment, the average value of the luminance difference is used as the determination material for determining the display region as the change in the pixel value included in the candidate region, but is not limited to the average value of the luminance difference. For example, a maximum value of luminance difference, an average value of chromaticity difference, a maximum value of chromaticity difference, or the like may be used.

  Next, the operation of the OSD display area determination unit 108 will be described. FIG. 4 is a flowchart showing the operation of the OSD display area determination unit 108. As described above, the OSD display area determination unit 108 determines an area in which an OSD image is displayed when a change in pixel adjustment value is detected by the image quality adjustment value monitoring unit 104. That is, the processing shown in FIG. 4 is performed when the image quality adjustment value changes and the content of the image quality adjustment changes, and when the image quality adjustment value does not change, the OSD display area determination unit 108 determines the latest. Continue to output the specified area. In the process shown in FIG. 4, four types of variables Ymin, Amin, Ycrt, and Acrt are used. The variable Amin is a variable indicating a display candidate area serving as a reference for comparison. The variable Ymin is a variable indicating the average brightness difference value of the display candidate area indicated by the variable Amin. That is, the variable Ymin indicates a luminance difference average value serving as a reference for comparison. The variable Acrt is a variable indicating a display candidate area to be compared. The variable Ycrt is a variable indicating the average luminance difference value of the display candidate area indicated by the variable Acrt. That is, the variable Ycrt indicates the average luminance difference value to be compared.

  When the change in pixel adjustment value is detected by the image quality adjustment value monitoring unit 104 and inputted, the OSD display area determination unit 108 first sets a value indicating the default display candidate area to Amin, and this default display candidate area. Are respectively substituted into Ymin (step S401). The default display candidate area is, for example, a display candidate area determined as an area for displaying the OSD image most recently. Moreover, you may select arbitrarily.

  Next, the OSD display area determination unit 108 arbitrarily selects one display candidate area from among the display candidate areas other than the default display candidate area (step S402).

  Next, the OSD display area determination unit 108 substitutes a value indicating the selected display candidate area for Acrt and a luminance difference average value of the selected display candidate area for Ycrt (step S403).

  Next, the OSD display area determining unit 108 compares the value of Ymin with the value of Ycrt (step S404). Then, the OSD display area determination unit 108 performs the process of step S405 when the value of Ycrt is smaller than the value of Ymin, and performs the process of step S406 otherwise.

  In step S405, the OSD display area determination unit 108 substitutes the value of Ycrt for Ymin and the value of Acrt for Amin. Thereafter, the OSD display area determination unit 108 performs the process of step S406.

  In step S406, the OSD display area determination unit 108 determines whether the processes in steps S403 to S405 including the determination in step S404 for all display candidate areas have been completed. Then, the OSD display area determination unit 108 performs the process of step S <b> 408 when it has been completed, and performs the process of step S <b> 407 when it has not been completed.

  In step S407, the OSD display area determination unit 108 arbitrarily selects one of the display candidate areas not subjected to the processes in steps S403 to S405 including the determination in step S404, and then performs the process in step S403.

  In step S408, the OSD display area determination unit 108 finally determines the display candidate area indicated by the value of Amin as an area for displaying the OSD image, and the display start position of the OSD image in the display candidate area. Set.

  In this way, the display area of the OSD image is determined. Then, the OSD image created by the OSD image creation unit 105 is synthesized by the image synthesis unit 109 in this display area, and the synthesized image signal is imaged and displayed by the display unit 110.

  According to the present embodiment as described above, the OSD image is displayed in an area where the change in luminance accompanying the image quality adjustment is the smallest among the plurality of display candidate areas. That is, a menu is displayed as an OSD image in an area that is least affected by image quality adjustment, and an OSD image is not displayed in a portion where the change in image quality due to image quality adjustment is large. Therefore, it is possible to avoid the difficulty in determining the image quality adjustment due to the overlapping of these. For this reason, the effect of image quality adjustment can be easily determined. In addition, since it is not necessary for the adjuster (user) to instruct the position of the OSD image, it is possible to avoid complicated operations.

  In the above-described embodiment, the number of display candidate areas is four, but the number of display candidate areas may be plural. Further, the number of pixels included in each display candidate region is not particularly limited. For example, when the area occupied by the OSD image on the display screen is large, the number of display candidate areas may be reduced and the number of pixels in the display candidate area may be increased. Conversely, if the area occupied by the OSD image on the display screen is small, the number of display candidate regions may be increased and the number of pixels in the display candidate region may be decreased.

  In the above-described embodiment, a configuration in which an input instruction is given from a remote controller using infrared rays is employed, but the input of the instruction is not particularly limited. For example, an adjustment dial (rotary adjuster), a touch panel, a mouse, or the like may be used.

  The embodiment of the present invention can be realized by, for example, a computer executing a program. Also, means for supplying a program to a computer, for example, a computer-readable recording medium such as a CD-ROM recording such a program, or a transmission medium such as the Internet for transmitting such a program is also applied as an embodiment of the present invention. Can do. The above-described print processing program can also be applied as an embodiment of the present invention. The above program, recording medium, transmission medium, and program product are included in the scope of the present invention.

It is a functional block diagram which shows the system configuration | structure of the display (image display apparatus) which concerns on embodiment of this invention. It is a schematic diagram which shows the outline | summary of a display candidate area | region. FIG. 6 is a schematic diagram showing processing of a difference calculation unit 107. 5 is a flowchart showing the operation of an OSD display area determination unit 108. It is a schematic diagram which shows the example of the screen of the conventional display.

Explanation of symbols

101: Instruction receiving unit 102: Input instruction analyzing unit 103: Image quality adjustment value determining unit 104: Image quality adjustment value monitoring unit 105: OSD image creating unit 106: Image quality adjusting unit 107: Difference calculating unit 108: OSD display area determining unit 109: Image composition unit 110: display unit

Claims (9)

An analysis means for analyzing the input instruction;
Specific image creating means for creating an on-screen display image based on the result of analysis by the analyzing means;
Image quality adjusting means for adjusting the image quality of the input image based on the result of analysis by the analyzing means;
A calculation unit that divides the input image into a plurality of regions, and calculates a change in pixel value of the image for each region before and after adjustment by the image quality adjustment unit;
A region determining unit that determines a region to synthesize the on-screen display image from among the plurality of regions based on a change in pixel value for each region calculated by the calculating unit;
Combining means for combining the on-screen display image with the area determined by the area determining means;
An image display device comprising:   The image display apparatus according to claim 1, wherein the area determination unit operates when a content of image quality adjustment by the image quality adjustment unit changes. An image quality adjustment value determining unit that determines an image quality adjustment value based on a result of the analysis by the analyzing unit and outputs the image quality adjustment value to the image quality adjusting unit;
Monitoring means for monitoring a change in the image quality adjustment value, and outputting the fact to the area determining means when the image quality adjustment value is changed;
The image display apparatus according to claim 2, further comprising:   The image according to any one of claims 1 to 3, wherein the calculating means determines the size and number of the regions according to an area of the on-screen display image on a display screen. Display device.   5. The image according to claim 1, wherein the calculation unit calculates an average value of a change in luminance in all pixels constituting the region as a change in a pixel value of the image. Display device.   5. The calculation unit according to claim 1, wherein the calculation unit calculates an average value of a change in luminance in a plurality selected from pixels constituting the area as a change in a pixel value of the image. The image display device according to item 1.   7. The area determination unit according to claim 1, wherein the area determination unit determines an area having the smallest change in pixel value as the area to synthesize the on-screen display image. The image display device described in 1. An analysis step for analyzing the input instructions;
A specific image creating step for creating an on-screen display image based on the result of the analysis in the analyzing step;
An image quality adjustment step for adjusting the image quality of the input image based on the analysis result in the analysis step;
A calculation step of dividing the input image into a plurality of regions and calculating a change in pixel value of the image for each region before and after adjustment in the image quality adjustment step;
An area determining step for determining an area to synthesize the on-screen display image from among the plurality of areas based on a change in pixel value for each of the areas calculated in the calculating step;
Combining the on-screen display image with the region determined in the region determining step;
A control method for an image display device, comprising: On the computer,
An analysis step for analyzing the input instructions;
A specific image creating step for creating an on-screen display image based on the result of the analysis in the analyzing step;
An image quality adjustment step for adjusting the image quality of the input image based on the analysis result in the analysis step;
A calculation step of dividing the input image into a plurality of regions and calculating a change in pixel value of the image for each region before and after adjustment in the image quality adjustment step;
An area determining step for determining an area to synthesize the on-screen display image from among the plurality of areas based on a change in pixel value for each of the areas calculated in the calculating step;
Combining the on-screen display image with the region determined in the region determining step;
A program characterized by having executed.

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