JP2008224997A - Image quality adjustment method, image quality adjustment device, image display device, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image quality adjustment method and device that can correctly grasp effect of image quality adjustment at a low cost to facilitate the image quality adjustment for an image display device. <P>SOLUTION: A display image is divided into a plurality of image areas, and image quality adjustment processing based upon different image quality adjustment values is performed on the plurality of image areas, which are displayed as one display image. For example, the display image is divided into two image areas to performs an image quality adjustment processing based upon an image quality adjustment value before image quality adjustment value setting change on one image area and an image quality adjustment processing based upon the image quality adjustment value during the image quality adjustment value setting change on the other image area. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image quality adjustment method and apparatus suitable for various apparatuses that display images, such as a display, a TV, and a projector, an image display apparatus having the image quality adjustment function, and a program.

  Conventionally, an image display apparatus has various image quality adjustment functions such as hue, chromaticity, contrast, and luminance of a display image. As an adjustment method, adjustment of an image quality factor by a button or OSD (on-screen display) display was performed. However, in this type of conventional image quality adjustment, there is a difficulty that it is difficult to objectively determine whether the adjustment is optimal.

  As a conventional technique for improving this, there is a method of simultaneously reducing a default image or a pre-adjusted reduced image and a reduced image reflecting image quality adjustment by reducing the input images and arranging a plurality of images on one screen (see FIG. For example, Patent Document 1).

Japanese Patent No. 3701204

  According to the method of Patent Document 1, since an image before image quality adjustment and an image subjected to image quality adjustment can be compared, image quality adjustment is facilitated, but since the comparison is based on a reduced screen that is not an actual display image, There is a problem that the adjustment effect of different actual images is not similar. Further, in order to perform multi-screen processing, it is necessary to have a memory for the screen to be processed, and a means for reducing an image is required, which causes a problem that the circuit scale increases and the cost increases.

  Further, in Patent Document 1, since the preset image quality adjustment value is a value that is not updated in the adjustment operation, it is possible to compare the image of the image quality adjustment value that is unchanged and the image that is being adjusted. Since it is not possible to compare the images with the previous image quality adjustment value by exchanging them, it is inconvenient as image quality adjustment because absolute comparison is possible but relative comparison is not possible.

  In the present invention, the image quality adjustment is performed at the same resolution as the actually displayed image so that the effect of the image quality adjustment can be correctly grasped, the image quality adjustment is facilitated, and the increase in circuit scale is also suppressed. It is an object to provide an image quality adjustment method and apparatus, an image display apparatus including the image quality adjustment apparatus, and a program that causes a computer to execute the image quality adjustment method.

  In addition, the present invention provides an image area that is selected from a plurality of image quality adjustment values such as a video mode, and is processed with a difference in image quality adjustment values in an area different from the image area of the image quality adjustment value being set. Accordingly, it is an object to provide an image quality adjustment method and apparatus that make it easier to determine an adjustment effect, an image display apparatus including the image quality adjustment apparatus, and a program that causes a computer to execute the image quality adjustment method.

  The main feature of the present invention is to divide a display image into a plurality of image areas, perform image quality adjustment processing based on different image quality adjustment values for the plurality of image areas, and display the image as a single display image.

  In one embodiment, for a plurality of image areas, image quality adjustment processing based on the image quality adjustment value before the image quality adjustment value setting change is performed at least in the first image area, and the image quality during the image quality adjustment value setting change in the second image area. Image quality adjustment processing based on the adjustment value is performed.

  In another embodiment, in a plurality of image areas, the first image area performs image quality adjustment processing based on the image quality adjustment value that is being changed, and in the other image areas, the image quality adjustment value setting change is performed. The image quality adjustment processing is performed based on the image quality adjustment value obtained by increasing or decreasing the image quality adjustment value in the middle by a predetermined value.

  In yet another embodiment, image quality adjustment processing is performed on a plurality of image areas based on a plurality of image quality adjustment values of different combinations.

  In addition, according to the present invention, the image quality adjustment value during the image quality adjustment value setting change is changed to an image quality adjustment value before the image quality adjustment value setting change or a predetermined image quality adjustment value according to a predetermined operation. . Further, the image quality adjustment values of a plurality of image areas are exchanged. Further, according to a predetermined operation, the image area image quality adjustment processing is performed based on the image quality adjustment value of the predetermined image area.

  In addition, the present invention is characterized in that a desired image quality adjustment OSD is displayed for each of a plurality of image areas of a display image.

According to the present invention, the following effects can be obtained.
(1) Image quality adjustment processing is performed with different image quality adjustment values for a plurality of image areas of a display image, and the image is displayed as a single image, so that the image quality adjustment can be performed with the same resolution as the actually displayed image. It is possible to correctly grasp the effect of the image quality and to facilitate image quality adjustment. Furthermore, there is no need to prepare a memory for the screen to be processed, and no image reduction means for reducing the image at the time of adjustment is required, so the circuit scale is reduced, and the optimum image quality adjustment is achieved at low cost. It can be done while checking correctly.
(2) By displaying an image that has been subjected to a plurality of image quality adjustment processes based on the image quality adjustment value before and after the image quality adjustment value setting adjustment, the image can be adjusted with reference to the image before the setting. Adjustment becomes easy.
(3) By displaying an image that has undergone image quality adjustment processing based on the image quality adjustment value that is being set and a plurality of image quality adjustment values that have a predetermined difference, the screen that is being set and the display before and after that screen Can be compared, and adjustment becomes easier.
(4) In a plurality of image areas, by displaying an image subjected to image quality adjustment processing based on a plurality of types of image quality adjustment values of different combinations, a predetermined tendency is given to a plurality of predetermined image quality adjustment values. This makes it easy to check the effects such as the video mode and to make settings easily.
(5) By returning the image quality setting value during the image quality adjustment setting to the image quality adjustment value before the setting by a predetermined operation, the adjustment can be stopped, thereby improving the usability of the image quality adjustment. Further, by adjusting the image quality setting value during the image quality adjustment setting to a predetermined initial image quality adjustment value by a predetermined operation, ease of use such as recovery of image quality adjustment failure is improved.
(6) By changing the image quality adjustment values of a plurality of image areas by a predetermined operation, it is easy to confirm the effect on the entire screen.
(7) By performing an operation of selecting one of a plurality of image areas, the image quality adjustment value of the selected image area is processed as the image quality adjustment value of the entire image area, thereby making it easier than the conventional image quality adjustment function. It is possible to realize an image quality adjustment setting.
(8) Displaying a desired image quality adjustment OSD for each of a plurality of image areas of the display image further improves the ease of use of image quality adjustment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration example of an image display apparatus to which the present invention is applied. The user operates the operation unit 60 to input various instructions such as start and end of image quality adjustment, setting and changing of image quality adjustment values, and the like. The image quality adjustment value storage unit 70 stores image quality adjustment values such as an initial setting value (for example, factory shipment value), a setting value before adjustment (current adjustment value), and a setting value being adjusted (adjustment value). In an embodiment, the image quality adjustment value storage unit 70 stores a plurality of video modes. At the start of image quality adjustment, for example, the current adjustment value is set as an adjustment value (adjustment value = current adjustment value), and at the time of image quality adjustment, the adjustment value is changed each time a predetermined operation is performed on the operation unit 60. When the image quality adjustment ends, the adjustment value at that time is set as the current adjustment value (current adjustment value = adjustment value). Further, the initial setting value is set as the current adjustment value by a predetermined operation of the operation unit 60.

  The input image data is temporarily stored in the input image data storage unit 10 in units of pixels, lines, frames, etc., and sequentially sent to the image quality adjustment unit 20. For the input image data sent from the input image data storage unit 10, the image quality adjustment unit 20 stores the image quality adjustment value stored in the image quality adjustment value storage unit 70 for each predetermined image area according to the operation of the operation unit 60. The output image data is generated by performing different image quality adjustment processing according to the above. The generated output image data is combined with the OSD data sent from the OSD control unit 80 if necessary in the image combining unit 30, stored in the output image data storage unit 40, and then sent to the display unit 50 for display. The

  For example, the image quality adjustment unit 20 performs image quality adjustment processing on the first image area of the input image data based on the image quality adjustment value of the setting value before adjustment (current setting value), and the second image area is the setting value being adjusted. The image quality adjustment processing is performed according to the image quality adjustment value of (Adjustment Value). At the start of image quality adjustment, the current adjustment value is set as the adjustment value, so the entire area of the output image reflects the current adjustment value. During the image quality value adjustment, the first image area of the output image data still reflects the current adjustment value, but the image quality of the second area changes corresponding to the change of the adjustment value. Thereby, the user can grasp the effect of the image quality adjustment at the same resolution as the input image data by comparing the screen of the first image area (reference screen) and the screen of the second image area (adjustment screen). Can do. Further, if the image quality adjustment values of the first image area and the second image area are switched by the operation of the operation unit 60 (that is, the area of the reference screen and the adjustment screen is switched), the adjustment effect is obtained on the entire screen. Can be confirmed. At the end of image quality adjustment, the adjustment value at that time is set as the current adjustment value, so that the entire area of the output image data reflects the adjustment value (for example, the optimum adjustment value). Various embodiments can be considered as image quality adjustment, which will be described later.

FIG. 2 shows an example of the operation unit 60. The menu key is for displaying an image quality adjustment item menu (brightness, contrast, hue, γ conversion, video mode, etc.). When the menu key is operated, the image quality adjustment unit 20 instructs the OSD control unit 80 to display the OSD display of the image quality adjustment item menu, and the OSD control unit 80 receives this and combines the OSD data of the image quality adjustment item menu. To the unit 30. This is basically the same for other OSD displays. The ESC key is an escape key. For example, when this is operated during the OSD display of the image quality adjustment item menu, the image quality adjustment unit 20 instructs the OSD control unit 80 to hide the image, and the image quality adjustment is in progress. Is operated, the image quality adjustment unit 20 stops the image quality adjustment processing, and returns all the image areas to the images before adjustment. The “∧” and “∨” keys are used to change the adjustment value. At the time of image quality adjustment, the image quality adjustment unit 20 sets the adjustment value to a constant value each time this “∧” or “∨” key is operated. , “+” Or “−”. The “∧” and “∨” keys are also used to select an image quality adjustment item. Each time the “∧” or “∨” key is operated during the OSD display of the image quality adjustment item menu, the image quality adjustment section is displayed. 20 instructs the OSD control unit 80 to move the item. The “>” key is used to switch the adjustment screen, and at the time of image quality adjustment, each time this is operated, the image quality adjustment unit 20 switches the image area for image quality adjustment. The “<” key is used to change the setting value of the reference screen, and each time this is operated, the image quality adjustment unit 20 switches the setting value of the reference screen alternately between the current adjustment value and the initial setting value. The determination key is used for determining an image quality item to be processed and for ending image quality adjustment. For example, when the enter key is operated during the OSD display of the image quality adjustment item menu, the image quality adjustment unit 20 executes image quality adjustment processing for the image quality item selected at that time. If the enter key is operated during the image quality adjustment, the image quality adjustment unit 20 ends the image quality adjustment process and sets the adjustment value at that time as the current adjustment value.
The configuration of the operation unit 60 is not limited to FIG. The role of the key is not limited to the above.

Hereinafter, a few examples of image quality adjustment processing according to the present invention will be described in detail.
<Example 1>
In the present embodiment, an actually displayed image is divided into two, image quality adjustment processing based on a setting value before adjustment (current adjustment value) is performed on one image area, and adjustment is performed on the other image area. The image quality adjustment processing based on the set value (adjustment value) is performed and displayed. In this embodiment, the display image is divided into two parts to the left and right. Of course, the display image may be divided into two parts up and down.

  3 and 4 are display image examples of the image adjustment of this embodiment. FIG. 3 shows an example of a display image before image quality adjustment. When the menu key operation of the operation unit 60 is pressed, the OSD of the image quality adjustment item menu is combined with the image and displayed. Here, it is assumed that the brightness in the image quality adjustment item menu is selected and the brightness is adjusted. FIG. 4 is an example of a display image during image quality adjustment. In FIG. 4, an image in which the left half area is subjected to image quality adjustment processing using the image quality adjustment value before adjustment (current adjustment value), and an image in which the right half area is adjusted based on the image quality value adjustment value (adjustment value) being adjusted. Is shown. The brightness of the right half of the image is changed by a predetermined key operation (∧ or ∨ key operation) of the operation unit 60. FIG. 4 shows an image that is being adjusted in a direction in which the right half image increases the luminance. By a predetermined key operation (> key operation) of the operation unit 60, the left half area is replaced with the image being adjusted, and the right half area is replaced with the pre-adjustment image. Each time the key is operated, the pre-adjustment image and the image being adjusted are alternately switched. Further, the image quality adjustment value of the pre-adjustment image is changed to the initial setting value by a predetermined key operation (<key operation) of the operation unit 60. Each time the key is operated, the current adjustment value and the initial setting value are alternately changed.

  FIG. 5 is a configuration example of the image quality adjustment value storage unit 70 of the present embodiment. The image quality adjustment value storage unit 70 stores an initial setting value (for example, factory shipment value), an image quality adjustment value before adjustment (current adjustment value), and an image quality adjustment value (adjustment value) being adjusted. At the start of image quality adjustment, adjustment value = current adjustment value. During image quality adjustment, the adjustment value increases or changes by a predetermined value for every predetermined key operation (∧ or ∨ key operation) of the operation unit 60. When the determination key of the operation unit 60 is operated and the image quality adjustment process is completed, the value of the adjustment value at that time is stored as the current adjustment value.

  FIG. 6 is a basic flow of image quality adjustment processing of this embodiment. Here, X means the horizontal pixel position of the input image data. The input image data is temporarily stored in the input image data storage unit 10 in units of pixels, lines, frames, etc. (step 101) and sequentially sent to the image quality adjustment unit 20. The image quality adjustment unit 20 performs image quality adjustment processing with the image quality adjustment value 1 for the input image data X ≦ center area (hereinafter, left screen) (steps 102 and 103), and the input image data is X> center area. For (hereinafter, the right screen), image quality adjustment processing is performed with image quality adjustment value 2 (steps 102 and 104), and output image data is generated. As will be described later, the image quality adjustment value 1 and the image quality adjustment value 2 are set to the initial setting value, the current adjustment value, and the adjustment value of the image quality adjustment value storage unit 70 by a predetermined key operation of the operation unit 60. The output image data adjusted in image quality by the image quality adjusting unit 20 is combined with OSD data by the image combining unit 30 as necessary, stored in the output data storage unit 40 (step 105), and displayed on the display unit 50. .

  7, 8 and 9 are detailed flowcharts of the operation and image quality adjustment processing of this embodiment. Here, brightness adjustment is performed.

  When the menu key of the operation unit 60 is operated, the image quality adjustment unit 20 instructs the OSD control unit 80 to display the image quality adjustment item menu OSD (step 111). As a result, the image quality adjustment item menu is combined with the image and displayed (FIG. 3). The adjustment item is moved according to the operation of the “∧” or “∨” key of the operation unit 60, and the enter key is operated, whereby the item selected at that time is set as an image quality adjustment target (step 112, 113). Here, it is assumed that the luminance is selected. When the enter key is operated, the image quality adjustment unit 20 instructs the OSD control unit 80 to hide the image quality adjustment item menu OSD (step 114). In response to this, the OSD control unit 80 receives the image quality adjustment item menu OSD. Is hidden. Thereafter, the brightness adjustment starts. When the ESC key is operated, the image quality adjustment item menu OSD is similarly hidden (step 115), but the image quality adjustment ends without being started. In this case, the image quality adjustment unit 20 outputs the input image data as it is.

  When the enter key is operated, the image quality adjustment unit 20 instructs the OSD control unit 80 to hide the image quality adjustment item menu OSD, and then adjusts the image quality as image quality adjustment value 1 = current adjustment value and image quality adjustment value 2 = adjustment value ( The brightness adjustment process is started (step 116). As a result, an image that has undergone image quality adjustment processing with the current adjustment value is displayed on the left screen of the display image, and an image that has undergone image quality adjustment processing with the adjustment value is displayed on the right screen. However, since the adjustment value = current adjustment value at the start of image quality adjustment, an image based on the current adjustment value is displayed on both the left and right screens. Further, the image quality adjustment unit 20 instructs the OSD control unit 80 to display brightness adjustment OSD (step 117). As a result, a character string such as “before adjustment” is displayed on the left screen, and “adjusting” is displayed on the right screen (FIG. 4).

  Here, at the start of the image quality adjustment process, the image quality adjustment value = current adjustment value and the image quality adjustment value 2 = adjustment value are set, but conversely, the image quality adjustment value 2 = current adjustment value and the image quality adjustment value 2 = adjustment value are set. It may be. In short, the image quality adjustment may be started using the right screen or the left screen as the initial adjustment screen. When the current adjustment value is not set, the image quality adjustment value 1 = image quality adjustment value 2 = initial setting value may be set.

  After the start of image quality adjustment (brightness adjustment), the image quality adjustment unit 20 performs the following processing in accordance with a predetermined key operation of the operation unit 60 (step 118).

  When the “∧” or “∨” key is operated, the image quality adjustment unit 20 increases or decreases the adjustment value in the image quality adjustment value storage unit 70 by a constant value (α) (step 119). Then, it is determined whether the current adjustment screen (screen under adjustment) is the left screen or the right screen (step 120). If the screen is the left screen, the changed adjustment value is set as the image quality adjustment value 1 (step 121). If it is a screen, the changed adjustment value is set as the image quality adjustment value 2 (step 122). As a result, the image quality (luminance) of the adjustment screen changes (FIG. 4). Hereinafter, every time the “∧” or “∨” key is operated, the image quality of the adjustment screen changes sequentially.

  When the “>” key is operated, the image quality adjustment unit 20 performs the process of FIG. 8 (replacement of the adjustment screen and the pre-adjustment screen). The image quality adjustment unit 20 determines whether the current adjustment screen (screen during adjustment) is the left screen or the right screen (step 123). That is, it is determined whether image quality adjustment value 1 = adjustment value or image quality adjustment value 2 = adjustment value. If the current adjustment screen is the left screen (image quality adjustment value 1 = adjustment value), the image quality adjustment value 2 is set as the adjustment value, and the image quality adjustment value 1 is the current adjustment previously set to the image quality adjustment value 2. Or an initial set value (steps 124, 125, 126). If the current adjustment screen is the right screen (image quality adjustment value 2 = adjustment value), the image quality adjustment value 1 is set as the adjustment value, and the image quality adjustment value 2 is the current adjustment value that has been set to the image quality adjustment value 1 until then. Or it is set as an initial set value (steps 127, 128, and 129). Thereafter, the image quality adjustment unit 20 instructs the OSD control unit 80 to display brightness adjustment OSD change (step 137). As a result, the adjustment screen and the pre-adjustment screen in the display screen are switched left and right, and the OSD displays such as “during adjustment” and “before adjustment” are also switched left and right. Hereinafter, every time the “>” key is operated, the left / right permutation of the adjustment screen and the adjustment screen is repeated alternately.

  When the “<” key is operated, the image quality adjustment unit 20 performs the processing of FIG. 9 (replacement of image quality adjustment values on the screen before adjustment). The image quality adjustment unit 20 determines whether the current adjustment screen (screen during adjustment) is the left screen or the right screen (step 130). That is, it is determined whether image quality adjustment value 1 = adjustment value or image quality adjustment value 2 = adjustment value. If the current adjustment screen is the left screen (image quality adjustment value 1 = adjustment value), the image quality adjustment value 2 on the right screen, which is the pre-adjustment screen, is set to the initial setting value if it is the current adjustment value. If it is a set value, it is reset to the current adjustment value (steps 131, 132, 133). If the current adjustment screen is the right screen (image quality adjustment value 2 = adjustment value), the image quality adjustment value 1 on the left screen, which is the pre-adjustment screen, is set to the initial setting value if it is the current adjustment value. If it is a set value, it is reset to the current adjustment value (steps 134, 135, 136). Thereafter, the image quality adjustment unit 20 instructs the OSD control unit 80 to display brightness adjustment OSD change (step 137). As a result, the image quality adjustment value of the pre-adjustment screen in the display screen is changed from the current adjustment value to the initial setting value or from the initial setting value to the current adjustment value, and the “current adjustment value” and “initial setting value” in the pre-adjustment screen are changed. The OSD display such as “” is also changed. Thereafter, every time the “<” key is operated, the image quality adjustment value before adjustment is alternately switched from the current adjustment value to the initial setting value or vice versa.

  Although omitted in FIG. 7, the image quality adjustment unit 20 changes the image quality adjustment value of the current adjustment screen (during adjustment screen) in the display screen from the adjustment value to the initial set value by a predetermined key operation of the operation unit 60. Or, conversely, a process of alternately repeating may be performed.

  When the determination key is operated during image quality adjustment, the image quality adjustment unit 20 rewrites the current adjustment value in the image quality adjustment value storage unit 70 to the adjustment value at that time (step 138). Then, the image quality adjustment unit 20 sets both the image quality adjustment value 1 and the image quality adjustment value 2 to the current adjustment value (the adjustment value at that time), that is, sets the image quality adjustment values for both the left and right screens as the current adjustment values (step 140). The OSD controller 80 is instructed not to display the brightness adjustment OSD (step 141). As a result, on both the left and right screens, an image whose image quality has been adjusted with the adjustment value finally determined by the user is displayed, the OSD display on the display screen is also hidden, and the adjustment ends. When the ESC key is operated, the image quality adjustment unit 20 rewrites the adjustment value in the image quality adjustment value storage unit 70 to the current adjustment value (step 139), and then performs the processing of steps 140 and 141. In this case, both the left and right screens return to the screen before adjustment.

  In this embodiment, the image quality adjustment processing based on the image quality adjustment value before the change of the image quality adjustment value setting and the image quality adjustment value being adjusted is performed and displayed on the two image areas of the display image, and the image before the setting is referred to. Therefore, the image quality adjustment can be performed at the same resolution as the actually displayed image, the effect of the image quality adjustment is correctly grasped, and the image quality adjustment is facilitated. Further, by exchanging the image quality adjustment values of the two image areas, the adjustment effect can be confirmed on the entire screen. Also, by returning the image quality adjustment value being adjusted to the setting value before adjustment, or by setting the image quality adjustment value before adjustment or the image quality adjustment value being adjusted to the default setting value, It is easy to return to the default value or stop adjustment, and usability is improved.

  In this embodiment, the image quality adjustment value is brightness. However, in addition to brightness, various values such as contrast, chromaticity, hue, RGB balance, color density, γ characteristics, sharpness (esophasys), or combinations thereof are used. And is not limited to brightness.

<Example 2>
In this embodiment, an actually displayed image is divided into a plurality of regions, and an image quality adjustment process based on an image quality adjustment value (adjustment value) being adjusted and a plurality of image quality adjustment values having a predetermined difference from the adjustment value Is performed and displayed. Here, an example is shown in which the display image is divided into three regions in the horizontal direction, and the image quality adjustment processing is performed based on the three image quality adjustment values of the adjustment value and the image quality adjustment value having a ± α difference from the adjustment value. The image quality adjustment is brightness. Of course, the display image may be divided in the vertical direction.

  FIG. 10 is an example of a display image during image quality adjustment of this embodiment. The display image before image quality adjustment is the same as in FIG. In FIG. 10, the center image area is an image that has undergone image quality adjustment (brightness adjustment) processing using the image quality adjustment value (adjustment value) that is currently being adjusted, and the left image area is image quality adjustment that uses the image quality adjustment value of adjustment value-α. The processed image, the left area, shows an image that has been subjected to image quality adjustment processing with the image quality adjustment value of adjustment value + α. Correspondingly, an image quality (brightness) adjustment OSD such as “adjustment”, “∨”, “∧” is displayed in each image area. As the adjustment value, a setting value before adjustment (current setting value) is set at the start of image quality adjustment. Therefore, in the example of FIG. 10, at the start of image quality adjustment, the center area is the current adjustment value, the left area is the current area value −α, and the right area is the current adjustment value + α. . Thereafter, every time a predetermined key operation (∧ or ∨ key operation) of the operation unit 60 is performed, the adjustment value increases or decreases by, for example, ± 1. As a result, the image quality of the central image area changes corresponding to the increase / decrease of the adjustment value, and the image quality of the left and right image areas further changes with the image quality adjustment value of the adjustment value ± α. Further, the image quality adjustment values of the center left and right image areas are switched by a predetermined key operation (> key operation) of the operation unit 60. In addition, the adjustment value changes to the initial set value or the like by a predetermined key operation (<key operation) of the operation unit 60.

  FIG. 11 is a configuration diagram of the image quality adjustment storage unit 70 of the present embodiment. The image quality adjustment value storage unit 70 stores an initial setting value (for example, factory shipment value), an image quality adjustment value before adjustment (current adjustment value), an image quality adjustment value (adjustment value) being adjusted, and an α adjustment value. At the start of image quality adjustment, adjustment value = current adjustment value. During image quality adjustment, the adjustment value increases or decreases by, for example, ± 1 for each predetermined key operation (∧ or ∨ key operation) of the operation unit 60. When the determination key of the operation unit 60 is operated and the image quality adjustment process is completed, the value of the adjustment value at that time is stored as the current adjustment value. As the α adjustment value, for example, a user stores a desired value in advance, but the value can be changed at any time.

  FIG. 12 is a basic flow of image quality adjustment processing of the present embodiment. Here, X means the horizontal pixel position of the input image data. A and B mean predetermined positions in the horizontal direction, and 0 <A <B <maximum value. Note that the positions of A and B may be changed as necessary.

  The input image data is temporarily stored in the input image data storage unit 10 in units of pixels, lines, frames, etc. (step 201), and sequentially sent to the image quality adjustment unit 20. The image quality adjustment unit 20 performs image quality adjustment processing with the image quality adjustment value 1 for the region where the input image data is X ≦ A (hereinafter, left screen) (steps 202 and 203), and the region where the input image data is A ≦ B. The image quality adjustment processing is performed with the image quality adjustment value 2 (hereinafter referred to as the center screen) (steps 202 and 204), and the image quality adjustment with the image quality adjustment value 3 is performed for the area where the input image data is X> B (hereinafter, the right screen). Processing is performed (steps 202 and 205) to generate output image data. As will be described later, the image quality adjustment value 1, the image quality adjustment value 2, and the image quality adjustment value 3 are adjusted to the adjustment value or adjustment value ± α, the current adjustment value or current adjustment value ± α, the initial setting value or the initial setting value ± α, and the like. Is set. The output image data adjusted in image quality by the image quality adjusting unit 20 is combined with OSD data if necessary in the image combining unit 30, stored in the output image data storage unit 40 (step 206), and displayed on the display unit 50.

  13 to 16 are detailed flowcharts of the operation and image quality adjustment processing of this embodiment. Again, the image quality adjustment is for brightness. In FIG. 13, the processing of steps 211 to 215 is the same as that of steps 111 to 115 of FIG.

  When the enter key is operated (step 212), the image quality adjustment unit 20 instructs the OSD control unit 80 to hide the image quality adjustment item menu OSD (step 214), and then the image quality adjustment value 1 = adjustment value−α, Image quality adjustment value 2 = adjustment value, image quality adjustment value 3 = adjustment value + α (step 216), the OSD control unit 80 is instructed to display brightness adjustment OSD (step 217), and image quality adjustment (brightness adjustment) processing is performed. Start. At this time, the adjustment value = the current adjustment value, the image on the left side of the display screen is the image adjusted with the image quality adjustment value of the current adjustment value−α, and the image on the center screen is adjusted with the current adjustment value. An image is displayed, and an image that has been subjected to image quality adjustment processing with the image quality adjustment value of the current adjustment value + α is displayed on the right screen. Also, an OSD such as “∧” is displayed on the left screen, “Adjustment” (adjustment screen) is displayed on the center screen, and “∨” is displayed on the left screen.

  Here, at the start of the image quality adjustment process, the adjustment screen (current adjustment value) is set to the image quality adjustment values 1 and 3, although the central screen is the adjustment screen with the image quality adjustment value 2 = adjustment value (current adjustment value). Then, the image quality adjustment may be started using the left screen or the right screen as the adjustment screen. In addition, when the adjustment value or the current adjustment value in the image quality adjustment value storage unit 70 is empty, the image quality adjustment may be started by setting the initial setting value to the current adjustment value or the adjustment value.

  After the start of the image quality adjustment (brightness adjustment) process, the image quality adjustment unit 20 performs the following process in accordance with a predetermined key operation of the operation unit 60 (step 218).

  When the “∧” or “∨” key is operated, the image quality adjustment unit 20 performs the processing of FIG. 14 (updating the image quality adjustment value). The image quality adjustment unit 20 increases or decreases the adjustment value in the image quality adjustment value storage unit 70 by ± 1 (step 219). Then, it is determined whether the current adjustment screen is the left screen, the center screen, or the right screen (step 220). If the current adjustment screen is the left screen, image quality adjustment value 1 = adjustment value, image quality adjustment value 2 = adjustment value + α, and image quality adjustment value 3 = adjustment value−α are newly set (step 221). Similarly, if the current adjustment screen is the central screen, the image quality adjustment value 2 = adjustment value, the image quality adjustment value 1 = adjustment value−α, and the image quality adjustment value 3 = adjustment value + α are set again (step 222). If the adjustment screen is the right screen, the image quality adjustment value 3 = adjustment value, the image quality adjustment value 1 = adjustment value + α, and the image quality adjustment value 2 = adjustment value−α are set again (step 223). Thereby, the image quality (brightness) of the current adjustment screen changes according to the changed adjustment value, and the image quality of the other screens changes by ± α further than the changed adjustment value. This is repeated each time the “∧” or “∨” key is operated.

  When the “>” key is operated, the image quality adjustment unit 20 performs the processing of FIG. 15 (replacement of the adjustment screen). The image quality adjustment unit 20 determines whether the current adjustment screen is the left screen, the center screen, or the right screen (step 224). If the current adjustment screen is the left screen, image quality adjustment value 2 = adjustment value, image quality adjustment value 1 = adjustment value−α, and image quality adjustment value 3 = adjustment value + α (step 225). In this case, the adjustment screen becomes the central screen, the central screen is processed with the adjustment value, the left screen is processed with the adjustment value -α, and the right screen is processed with the adjustment value + α. If the current adjustment screen is the central screen, the image quality adjustment value 3 = adjustment value, the image quality adjustment value 1 = adjustment value + α, and the image quality adjustment value 2 = adjustment value−α are set (step 226). In this case, the adjustment screen is the right screen, the right screen is processed with the adjustment value, the left screen is processed with the adjustment value + α, and the center screen is processed with the adjustment value −α. If the current adjustment screen is the right screen, image quality adjustment value 1 = adjustment value, image quality adjustment value 2 = adjustment value + α, and image quality adjustment value 3 = adjustment value−α (step 227). In this case, the adjustment screen is the left screen, the left screen is processed with the adjustment value, the center screen is processed with the adjustment value + α, and the right screen is processed with the adjustment value −α.

  After executing the above steps 225 to 227, the image quality adjustment unit 20 instructs the OSD control unit 80 to display the brightness adjustment OSD change (step 233). As a result, the OSD display screen such as “adjustment”, “∧”, “∨”, etc. is also switched.

  Thereafter, every time the “>” key is operated, the adjustment screen and other screens are sequentially switched, and the OSD display screens such as “adjustment”, “∧”, and “∨” are also switched correspondingly. Here, every time the “>” key is operated, the adjustment screen and other screens are switched clockwise. However, even if a function of switching counterclockwise according to a predetermined key operation of the operation unit 60 is added, Good.

  Next, when the “<” key is operated, the image quality adjustment unit 20 performs the process of FIG. 16 (replacement of adjustment values). The image quality adjustment unit 20 changes the adjustment value in the image quality adjustment value storage unit 70 to the initial setting value (step 228). The adjustment value at that time is saved in a predetermined memory or the like. Then, it is determined whether the current adjustment screen is the left screen, the center screen, or the right screen (step 229), and one of steps 230, 231, and 232 is executed, and the process proceeds to step 233 in FIG. Thus, the adjustment screen is processed with the initial setting value, the other screen is processed with the initial setting value + α, and the other screen is processed with the initial setting value −α. Further, for example, an OSD such as “initial value setting value” is displayed on the adjustment screen. Since the processing of Steps 230, 231, and 232 is the same as Steps 221, 222, and 223 of FIG. 14 (just the adjustment value is replaced with the initial setting value), detailed description is omitted. When the “<” key is operated again, the initial setting value is replaced with the saved adjustment value, and the original value is restored. Thereafter, every time the “<” key is operated, the exchange of the adjustment value and the initial setting value is alternately repeated.

  In step 228 of FIG. 16, the adjustment value may be changed to the current adjustment value. As a result, the adjustment value can be replaced with the current adjustment value. Alternatively, the adjustment value and the initial setting value or the current adjustment value may be switched depending on cases by a predetermined key operation of the operation unit 60.

  Returning to FIG. 13, when the determination key is operated during image quality adjustment, the image quality adjustment unit 20 rewrites the current adjustment value in the image quality adjustment storage unit 70 to the adjustment value at that time (step 234). Then, the image quality adjustment unit 20 sets the image quality adjustment values (image quality adjustment values 1, 2, and 3) for the entire screen to the current adjustment values (step 236), and hides the brightness adjustment OSD from the OSD control unit 80. An instruction is given (step 237). As a result, the image quality adjusted with the adjustment value finally determined by the user is displayed in all areas of the display screen, the OSD display on the display screen is also hidden, and the adjustment ends. On the other hand, when the ESC key is operated, the image quality adjustment unit 20 rewrites the adjustment value in the image quality adjustment value storage unit 70 to the current adjustment value (step 235), and then performs the processing of steps 236 and 237. In this case, the display screen returns to the screen before adjustment.

  In the present embodiment, the adjustment effect is adjusted by performing the image quality adjustment process using the adjustment value during the image quality (brightness) adjustment and the adjustment value having ± predetermined difference in the three image areas of the display image. Therefore, the image quality can be adjusted more easily than in the first embodiment. Further, by replacing the adjustment value being adjusted and the adjustment value having ± predetermined difference with three image areas, the adjustment effect can be confirmed on the entire screen as in the first embodiment. Further, by setting the adjustment value as the setting value before adjustment or the initial setting value, it is possible to restore the original value when the image quality adjustment fails or is lost, and it is easy to stop the adjustment.

  In this embodiment, the image quality adjustment value is set to luminance. However, as described above, various values such as contrast, chromaticity, hue, RGB balance, color density, γ characteristics, sharpness (esofassis), etc., are available in addition to luminance. Or a combination thereof, and is not limited to luminance.

  FIG. 17 and FIG. 18 show an operation / processing flow obtained by further expanding the second embodiment. This allows the user to arbitrarily change the α value during image quality adjustment. Increasing the α value opens a difference in adjustment values between the adjustment screen and the other two screens (opens the image quality), and conversely reduces the difference to make the image quality adjustment easier. Although the brightness adjustment is also targeted here, it is not limited to this as described above.

  FIG. 17 is the same as FIG. 13 except for the processing 250, and a description thereof will be omitted. A process 250 is an α value change process, and FIG. 18 is an operation / process flow thereof. Hereinafter, FIG. 18 will be described.

  When the menu key is operated during image quality adjustment (brightness adjustment), the image quality adjustment unit recognizes that the α value setting has been changed, reads the current α value from the screen adjustment value storage unit 70, and sends it to the OSD control unit 80. A setting OSD display is instructed (step 251). As a result, the current α value is OSD-displayed on the display screen. Thereafter, each time the “調整” or “∨” key of the operation unit 60 is operated, the image quality adjustment unit 20 increases or decreases the α value (steps 253 and 254), and changes the α adjustment OSD to the OSD control unit 80. (Step 255). Thereby, the α value OSD display on the display screen is also increased or decreased.

  The image quality adjustment unit 20 determines whether the current adjustment screen is the left screen, the center screen, or the right screen (step 256). If the current adjustment screen is the left screen, the image quality adjustment value 1 remains the adjustment value at that time, and the image quality adjustment values 2 and 3 are changed to the adjustment value + α or the adjustment value −α. (Step 257). Similarly, if the current adjustment screen is the central screen, the image quality adjustment value 2 = the adjustment value is left as it is, and the image quality adjustment values 3 and 1 are changed to the adjustment value + α or the adjustment value −α. (Step 258), if the current adjustment screen is the right screen, the image quality adjustment value 3 = the adjustment value is left as it is, and the image quality adjustment values 1 and 2 are used to adjust the adjustment value + α or the adjustment value. -Α is set (step 259). As a result, when the α value increases, the difference in image quality between the adjustment screen and the other two screens opens. Conversely, when the α value decreases, the difference decreases.

  When the enter key of the operation unit 60 is operated, the image quality adjustment unit 20 holds the α value at that time in the image quality adjustment value storage unit 70 and instructs the OSD control unit 80 to hide the αD setting OSD. (Step 260), the α value changing process is terminated. Thereby, the α value OSD display on the display screen is not displayed. The image quality adjustment unit 20 waits for the next key operation.

  As described above, in this embodiment, an example in which three image areas are displayed as shown in FIG. 10 has been described, but the number may be more than three. For example, there are five image areas, the image quality adjustment value (adjustment value) being adjusted for the first image area, the adjustment value + α for the second image area, the adjustment value + 2α for the third image area, For example, the output image data is generated by applying an image quality adjustment value such as the adjustment value −α to the fourth image region and the adjustment value −2α to the fifth image region. Further, the adjustment screen may be, for example, a lower half screen, and the upper half screen may be divided into a plurality of screens to display a screen for comparison with the adjustment screen, and the upper and lower screens may be reversed.

<Example 3>
In this embodiment, image quality adjustment processing is performed by selecting a video mode composed of a combination of a plurality of different image quality adjustment values for a plurality of image areas of a display image. The video mode is represented by a combination of brightness, contrast, chromaticity, hue, RGB balance, and color density. In the following description, the number of video modes to be selected is four, but the number to be selected may be plural, and the present embodiment is not limited to four.

  FIG. 19 shows an example of a display image when the video mode is selected in this embodiment. This indicates that images having undergone image quality adjustment processing in different video modes 1 to 4 are displayed in the four image areas at the lower left, upper left, lower right, and upper right of the display screen. The video modes of these four areas are switched clockwise or counterclockwise by a predetermined key operation (> or <key operation) of the operation unit 60. Further, a video mode of a predetermined image area is selected by a predetermined key operation of the operation unit 60. In this embodiment, it is assumed that the video mode of the upper right image area at that time is selected by the enter key operation. The selected video mode is set as the current video mode. The image quality adjustment unit 20 ends the image quality adjustment by generating image data by performing image quality adjustment processing for all image areas of the display image using a plurality of image quality adjustment values in the current video mode. The current video mode is stored in the image quality adjustment value storage unit 70.

  FIG. 20 is a configuration example of the image quality adjustment value storage unit 70 of the present embodiment. The image quality adjustment value storage unit 70 stores video modes 1 to 4 and combinations of different types (plural items) of image quality adjustment values and the current video mode. If the current video mode is unconfirmed, a specific video mode (for example, mode 1) in the video modes 1 to 4 is set as a default.

  FIG. 21 is a basic flow of image quality adjustment processing of this embodiment. Here, X means the horizontal pixel position of the input image data, and Y means the vertical pixel position of the input image data.

  The input image data is temporarily stored in the input image data storage unit 10 in units of pixels, lines, frames, etc. (step 301), and sequentially sent to the image quality adjustment unit 20. The image quality adjustment unit 20 determines whether the area of the input image data is left or right from the center, or below or above the center (steps 302 to 304), and the image quality for the lower left image area (X ≦ center, Y ≦ center). Image quality adjustment processing is performed using adjustment value 1 (step 305), and image quality adjustment processing using image quality adjustment value 2 is performed for the upper left image region (X ≦ center, Y> center) (step 306). For the region (X> center, Y ≦ center), the image quality adjustment processing is performed with the image quality adjustment value 3 (step 307), and for the upper right image region (X> center, Y> center), the image quality adjustment processing is performed with the image quality adjustment value 4. (Step 308) to generate output image data. As will be described later, one of the adjustment values of the video modes 1 to 4 in the image quality adjustment value storage unit 70 is set to the image quality adjustment values 1 to 4. The output image data subjected to the image quality adjustment processing by the image quality adjustment unit 20 is combined with the OSD data of the OSD control unit 80 if necessary by the image composition unit 30 and stored in the output image data storage unit 40 (step 309). Is displayed.

  FIG. 22 is a detailed flow of the key operation and image quality adjustment processing of this embodiment. In FIG. 22, Steps 311 to 315 are basically the same as Steps 111 to 115 of FIG. However, in steps 312, 313, video modes 1 to 4 are selected. The selected video modes 1 to 4 (a plurality of types of image quality adjustment values) are stored in the image quality adjustment value storage unit 70, and the specific video mode (for example, mode 1) is initially set to the current video mode. .

  Hereinafter, the operation when the video mode is selected will be described. Here, the video mode (video mode with image quality adjustment value 4) in the upper right image area of the display image is set as the final selection target video mode (current video mode target).

  When the video mode is selected, the image quality adjustment unit 20 first determines the current video mode (step 316). If the current video mode is the video mode 1, the image quality adjustment value 4 is set to the video mode 1, and the image quality adjustment values 1, 2, and 3 are set to the video modes 3, 4, 2 respectively (step 317). If the current video mode is video mode 2, the image quality adjustment value 4 is set to video mode 2, and the image quality adjustment values 1, 2, and 3 are set to video modes 4, 1, and 3, respectively (step 318). Similarly, if the current video mode is video mode 3, the image quality adjustment value 4 is set to video mode 3, the image quality adjustment values 1, 2, and 3 are set to video modes 1, 2, 4 (step 319), and the current video mode is video. If it is mode 4, the image quality adjustment value 4 is set to video mode 4, and the image quality adjustment values 1, 2, and 3 are set to video mode 2, 3, 1 (step 320).

  FIG. 23 shows the relationship between each area of the display image (display screen) and the video modes 1 to 4 at this time. For example, when the current video mode is the video mode 1, the upper right area of the display image is displayed in the image mode 1, and the lower left area, the upper left area, and the lower right area are the video modes 3, 4, 2 respectively. The processed image is displayed ((a) of FIG. 23). Similarly, when the current video mode is the video modes 2, 3, and 4, the correspondence between each area of the display image and the video modes 1 to 4 is as shown in (b) to (d) of FIG.

  The image quality adjustment unit 20 instructs the OSD control unit 80 to display the video mode selection OSD by passing the correspondence between each area of the display image and the video modes 1 to 4 (step 321). As a result, the corresponding mode is OSD-displayed in each area of the display screen (for example, FIG. 19).

  When the “>” key of the operation unit 60 is operated, the image quality adjustment unit 20 replaces the image quality adjustment values 1, 2, 3, 4 with the image quality adjustment values 2, 4, 1, 3 at that time, respectively ( Steps 322, 323). This is a case where the video mode of each area of the display image (display screen) is changed counterclockwise. FIG. 24 shows how the video mode moves between the areas in this case. For example, in FIG. 24A, the lower left area changes from the video mode 3 to the upper left area video mode 4, the upper left area changes from the video mode 4 to the upper right area video mode 1, and the lower right area changes from the video mode 2 to the lower left area. In the video mode 3, the upper right area is switched from the video mode 1 to the lower right area video mode 2. The same applies to (b) to (d) of FIG. Thereafter, each time the “>” key is operated, as shown in FIGS. 24A to 24D, the video mode of each area of the display image is switched in the counterclockwise direction. The video mode OSD display is also switched (steps 322, 323, and 321).

  When the “<” key of the operation unit 60 is operated, the image quality adjustment unit 20 replaces the image quality adjustment values 1, 2, 3, 4 with the image quality adjustment values 3, 1, 4, 2 at that time. (Steps 322 and 324). This is a case where the video mode of each area of the display image (display screen) is switched clockwise. FIG. 25 shows how the video mode moves between the areas in this case. In FIG. 25A, the lower left area changes from the video mode 3 to the lower right area video mode 2 and the upper left area changes from the video mode 4 to the lower left area video mode 3 contrary to the previous FIG. The lower right area is switched from video mode 2 to video mode 1 in the upper right area, and the upper right area is switched from video mode 1 to video mode 4 in the upper right area. The same applies to (b) to (d) of FIG. Thereafter, every time the “<” key is operated, as shown in FIGS. 25A to 25D, the video mode of each area of the display image is switched clockwise, and the video of each area is correspondingly changed. The mode OSD display is also switched (steps 322, 324, 321).

  When the enter key of the operation unit 60 is operated, the image quality adjustment unit 20 sets the image quality adjustment values 1 to 4 to the image mode of the image quality adjustment value 4 at that time (step 325), and the image is adjusted to the OSD control unit 80. An instruction to hide the OSD for mode selection is given (step 327). As a result, the entire image area of the display image is displayed after being subjected to image quality adjustment processing using the same plurality of image quality adjustment values as the video mode of the upper right image area, and the mode OSD display of each image area is hidden. Then, the video mode of the image quality adjustment value 4 is held in the image quality adjustment value storage unit 70 as the current video mode.

  When the ESC key of the operation unit 60 is operated, the image quality adjustment unit 20 sets the image quality adjustment values 1 to 4 to the pre-operation video mode (step 326). In this case, the entire image area of the display image returns to the image before the operation.

  According to the present embodiment, the effect of each video mode can be obtained by performing image quality adjustment processing and displaying in a plurality of video modes with a plurality of types of image quality adjustment values of different combinations on a plurality of image areas of the display image. The optimum video mode can be selected while comparing. Further, by changing the video mode of each image area of the display image, the adjustment effect can be confirmed on the entire display screen.

  Note that the processing functions of some or all of the components in the apparatus shown in FIG. 1 can be configured by a computer program and the program can be executed using the computer to implement the present invention, or FIG. It goes without saying that the processing procedure shown in the other flowcharts can be constituted by a computer program and the program can be executed by the computer. In addition, a computer-readable recording medium such as an FD, MO, ROM, memory card, CD, or the like is stored in the computer. In addition, the program can be recorded and stored on a DVD, a removable disk, etc., and the program can be distributed through a network such as the Internet.

The block diagram which shows the structural example of the image display apparatus to which this invention is applied. The figure which shows an example of an operation part. FIG. 4 is a diagram illustrating a display image example (before adjustment) according to the first embodiment. FIG. 6 is a diagram illustrating an example of a display image (during adjustment) according to the first embodiment. 3 is a diagram illustrating a configuration example of an image quality adjustment value storage unit according to Embodiment 1. FIG. FIG. 3 is a basic processing flowchart of the first embodiment. FIG. 3 is a flowchart of details of operation / processing according to the first embodiment. FIG. 8 is a detailed flowchart of partial processing in FIG. 7. FIG. 8 is a detailed flowchart of the same partial processing in FIG. 7. FIG. 6 is a diagram illustrating an example of a display image according to the second embodiment. FIG. 10 is a diagram illustrating a configuration example of an image quality adjustment value storage unit according to the second embodiment. FIG. 6 is a basic process flow diagram of Embodiment 2. FIG. 10 is a flowchart of details of operation / processing according to the second embodiment. FIG. 14 is a detailed flowchart of partial processing in FIG. 13. FIG. 14 is a detailed flowchart of the same partial processing in FIG. 13. FIG. 14 is a detailed flowchart of the same partial processing in FIG. 13. FIG. 14 is a detailed operation / processing flow diagram further expanding FIG. FIG. 18 is a detailed flowchart of α value change processing in FIG. 17. FIG. 10 is a diagram illustrating an example of a display image according to the third embodiment. FIG. 10 is a diagram illustrating a configuration example of an image quality adjustment value storage unit according to the third embodiment. FIG. 9 is a basic process flow diagram of Embodiment 3. FIG. 10 is a flowchart of details of operation / processing according to the third embodiment. The figure which shows the example of a response | compatibility with an image area | region and video mode. The figure which shows replacement | exchange of a video mode (counterclockwise rotation). The figure which shows replacement | exchange (clockwise rotation) of a video mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Input image data storage part 20 Image quality adjustment part 30 Image composition part 40 Output image data storage part 50 Display part 60 Operation part 70 Image quality adjustment value storage part 80 OSD control part

Claims (13)

  An image quality adjustment method for adjusting the image quality of a display image, wherein the display image is divided into a plurality of image areas, and image quality adjustment processing is performed on each of the plurality of image areas based on different image quality adjustment values, thereby displaying the image as a single display image. An image quality adjustment method characterized by:   For the plurality of image areas, at least the first image area is subjected to image quality adjustment processing based on the image quality adjustment value before the image quality adjustment value setting change, and the second image area is based on the image quality adjustment value being changed. The image quality adjustment method according to claim 1, wherein image quality adjustment processing is performed.   In the plurality of image areas, image quality adjustment processing based on the image quality adjustment value being changed in the image quality adjustment value setting is performed in the first image area, and image quality adjustment values being changed in the image quality adjustment value setting in the other image areas. The image quality adjustment method according to claim 1, wherein the image quality adjustment processing is performed based on an image quality adjustment value obtained by increasing and decreasing a predetermined value.   The image quality adjustment method according to claim 1, wherein image quality adjustment processing is performed on the plurality of image regions based on a plurality of image quality adjustment values of different combinations.   4. The image quality adjustment method according to claim 2, wherein the image quality adjustment value during the image quality adjustment value setting change is changed to an image quality adjustment value before the image quality adjustment value setting change according to a predetermined operation.   4. The image quality adjustment method according to claim 2, wherein the image quality adjustment value being changed is changed to a predetermined image quality adjustment value in accordance with a predetermined operation.   The image quality adjustment method according to claim 3, wherein the predetermined value is changed according to a predetermined operation.   8. The image quality adjustment method according to claim 1, wherein image quality adjustment values of a plurality of image areas are exchanged in accordance with a predetermined operation.   9. The image quality adjustment method according to claim 1, wherein the image quality adjustment processing for all image areas is performed based on the image quality adjustment value for the predetermined image area in response to a predetermined operation.   The image quality adjustment method according to any one of claims 1 to 9, wherein an image quality adjustment OSD is displayed for each of a plurality of image regions of a display image.   An image quality adjustment apparatus comprising means for executing the image quality adjustment method according to claim 1.   An image display device comprising the image quality adjustment device according to claim 11.   A program for causing a computer to execute the image quality adjustment method according to any one of claims 1 to 10.

Images