JP6786235B2 - Image display device - Google Patents

Description

The present invention relates to an image display device.

There are increasing opportunities for image data with a wide dynamic range to be handled. Image data having a wide dynamic range is called "HDR (High Dynamic Range) image data". For example, there is a photographing device capable of generating HDR image data by photographing. HDR image data is often used in non-broadcasting work such as image editing. As a standard of HDR image data, for example, there is "SMPT ST 2084" proposed by SMPTE (Society of Motion Picture and Television Engineers; National Film and Television Association).

When the image display device performs display in a wide dynamic range (HDR display), it is required that the PQ (Perfectual Quantizer) curve defined by SMPTE ST 2084 be taken into consideration. The PQ curve is a curve created based on the brightness difference that can be discriminated by the human eye. The PQ curve is defined by a wide luminance range of 0.005-10000 cd / m ² .

Further, in an image display device such as a liquid crystal display device, local deming processing may be performed (Patent Document 1). In the local demming process, a light emitting unit (backlight unit) having a plurality of light emitting areas corresponding to each of the plurality of divided areas constituting the screen area is used. Specifically, the emission brightness of each light emitting region is individually controlled, and the image data is expanded based on the emission brightness of each light emitting region. As a result, the contrast of the displayed image (the image displayed on the screen) is improved. Further, in order to realize the HDR display, the brightness of the backlight portion is being increased. By increasing the upper limit of the emission brightness of the backlight portion (emission region), the contrast of the displayed image can be further increased.

Japanese Unexamined Patent Publication No. 2000-287499

When HDR display is performed, the emission brightness may be controlled to a very high brightness in many light emitting regions. Therefore, the power consumption of the image display device may increase. However, at the shooting site of image content such as a movie, the image display device may be driven by a battery, and the image display device may perform HDR display of the shot image. In such a case, due to the increase in power consumption described above, the image display device may not be able to perform HDR display for a long time, and the image display device may not be usable for long-time shooting. If the image display device is driven by the AC adapter, the image display device can perform HDR display for a long time. However, glare can increase user eye fatigue when very high brightness is displayed in many areas of the screen.

An object of the present invention is to provide a technique capable of reducing the power consumption of an image display device at the time of HDR display and the feeling of fatigue of the user when confirming the HDR display.

The first aspect of the present invention is
A light emitting means having a plurality of light emitting regions corresponding to a plurality of divided regions constituting the screen,
A display means for displaying a display image based on an input image on the screen by modulating the light from the light emitting means.
A feature amount acquisition means for acquiring a plurality of luminance features corresponding to each of the plurality of divided regions from the input image, and
A first information acquisition means for acquiring range information indicating a second dynamic range wider than the first dynamic range, and
A second information acquisition means for acquiring area information indicating an HDR image area, which is a part of the display image displayed on the screen, and
Detection to detect an HDR divided region, which is a divided region corresponding to the HDR image region, and a non-HDR divided region, which is a divided region not corresponding to the HDR image region, from the plurality of divided regions based on the region information. Means and
Display in the first dynamic range in the non-HDR division region based on the respective luminance features of the plurality of division regions, the range information, and the detection results of the HDR division region and the non-HDR division region. The individual control of the emission luminance of each of the plurality of emission regions and the gradation conversion of the input image are performed so that the display is performed in the second dynamic range in the HDR division region. Control measures to be performed and
Have,
The control means, together with the display image, has a threshold value of the brightness of the first graphic image showing the HDR image region, or the light emitted from the light emitting means and not the HDR division region and applied to the display means. An image display device comprising a compositing means for synthesizing the input image and the first or second graphic image so that the second graphic image indicating the area of the screen as described above is displayed. Is.
A second aspect of the present invention is
A light emitting means having a plurality of light emitting regions corresponding to a plurality of divided regions constituting the screen,
A display means for displaying a display image based on an input image on the screen by modulating the light from the light emitting means.
A feature amount acquisition means for acquiring a plurality of luminance features corresponding to each of the plurality of divided regions from the input image, and
A first information acquisition means for acquiring range information indicating a second dynamic range wider than the first dynamic range, and
A second information acquisition means for acquiring area information indicating an HDR image area, which is a part of the display image displayed on the screen, and
Detection to detect an HDR divided region, which is a divided region corresponding to the HDR image region, and a non-HDR divided region, which is a divided region not corresponding to the HDR image region, from the plurality of divided regions based on the region information. Means and
Display in the first dynamic range in the non-HDR division region based on the respective luminance features of the plurality of division regions, the range information, and the detection results of the HDR division region and the non-HDR division region. The individual control of the emission luminance of each of the plurality of emission regions and the gradation conversion of the input image are performed so that the display is performed in the second dynamic range in the HDR division region. Control measures to be performed and
Have,
The control means
A determination means for determining the emission brightness of each of the plurality of light emitting regions based on the respective luminance features of the plurality of divided regions, the range information, and the detection results of the HDR divided region and the non-HDR divided region. When,
A gradation conversion means that performs gradation conversion of the input image based on the range information, the detection results of the HDR divided region and the non-HDR divided region, and the emission brightness of each of the plurality of light emitting regions.
Have,
The determining means determines the emission brightness of the light emitting region corresponding to the non-HDR divided region among the plurality of light emitting regions by using the first luminance range set corresponding to the first dynamic range. Then, among the plurality of light emitting regions, the light emitting brightness of the light emitting region corresponding to the HDR divided region is determined using the second luminance range set corresponding to the second dynamic range .
The image display device is characterized in that the ratio of the first luminance range to the second luminance range matches the ratio of the first dynamic range and the second dynamic range .

A third aspect of the present invention is
A light emitting means having a plurality of light emitting regions corresponding to a plurality of divided regions constituting the screen,
A display means for displaying a display image based on an input image on the screen by modulating the light from the light emitting means.
It is a control method of an image display device having
A feature amount acquisition step of acquiring a plurality of luminance features corresponding to each of the plurality of divided regions from the input image, and
The first information acquisition step of acquiring range information indicating a second dynamic range wider than the first dynamic range, and
A second information acquisition step of acquiring area information indicating an HDR image area, which is a part of the display image displayed on the screen, and
Based on the area information, from the plurality of divided areas, an HDR divided area which is a divided area corresponding to the HDR image area and a non-HD which is a divided area not corresponding to the HDR image area.
A detection step for detecting the R division area and
Display in the first dynamic range in the non-HDR division region based on the respective luminance features of the plurality of division regions, the range information, and the detection results of the HDR division region and the non-HDR division region. The individual control of the emission luminance of each of the plurality of emission regions and the gradation conversion of the input image are performed so that the display is performed in the second dynamic range in the HDR division region. Control steps to perform and
Have,
In the control step, the brightness of the first graphic image showing the HDR image region or the light emitted from the light emitting means and not the HDR divided region and radiated to the display means is a threshold value together with the display image. An image display device comprising a compositing step of synthesizing the input image and the first or second graphic image so that the second graphic image indicating the area of the screen as described above is displayed. It is a control method of.
A fourth aspect of the present invention is
A light emitting means having a plurality of light emitting regions corresponding to a plurality of divided regions constituting the screen,
A display means for displaying a display image based on an input image on the screen by modulating the light from the light emitting means.
It is a control method of an image display device having
A feature amount acquisition step of acquiring a plurality of luminance features corresponding to each of the plurality of divided regions from the input image, and
The first information acquisition step of acquiring range information indicating a second dynamic range wider than the first dynamic range, and
A second information acquisition step of acquiring area information indicating an HDR image area, which is a part of the display image displayed on the screen, and
Detection to detect an HDR divided region, which is a divided region corresponding to the HDR image region, and a non-HDR divided region, which is a divided region not corresponding to the HDR image region, from the plurality of divided regions based on the region information. Steps and
Display in the first dynamic range in the non-HDR division region based on the respective luminance features of the plurality of division regions, the range information, and the detection results of the HDR division region and the non-HDR division region. The individual control of the emission luminance of each of the plurality of emission regions and the gradation conversion of the input image are performed so that the display is performed in the second dynamic range in the HDR division region. Control steps to perform and
Have,
The control step
A determination step of determining the emission brightness of each of the plurality of light emitting regions based on the respective luminance features of the plurality of divided regions, the range information, and the detection results of the HDR divided region and the non-HDR divided region. When,
A gradation conversion step for performing gradation conversion of the input image based on the range information, the detection results of the HDR divided region and the non-HDR divided region, and the emission brightness of each of the plurality of light emitting regions.
Including
In the determination step, the emission brightness of the emission region corresponding to the non-HDR division region among the plurality of emission regions is determined using the first luminance range set corresponding to the first dynamic range. Then, among the plurality of light emitting regions, the light emitting brightness of the light emitting region corresponding to the HDR divided region is determined using the second luminance range set corresponding to the second dynamic range .
A control method for an image display device, characterized in that the ratio of the first luminance range to the second luminance range matches the ratio of the first dynamic range to the second dynamic range .

A fifth aspect of the present invention is a program for causing a computer to execute each step of the above-described image display device control method.

According to the present invention, it is possible to reduce the power consumption of the image display device at the time of HDR display and the feeling of fatigue of the user when confirming the HDR display.

A block diagram showing an example of the functional configuration of the image display device according to the first embodiment. A block diagram showing an example of the functional configuration of the image display device according to the first embodiment. The figure which shows an example of the target image data and the luminance feature amount which concerns on Example 1. The figure which shows the detection result and an example of the HDR region and HDR division region which concerns on Example 1. The figure for demonstrating an example of BL conversion information which concerns on Example 1. The figure which shows the detection result of the HDR division region and an example of emission brightness which concerns on Example 1. The figure for demonstrating an example of the conversion process which concerns on Example 1. The figure which shows an example of the viewer image which concerns on Example 1. A block diagram showing an example of the functional configuration of the image display device according to the second embodiment. A block diagram showing an example of the functional configuration of the image display device according to the second embodiment. The figure which shows an example of the correction luminance which concerns on Example 2. A block diagram showing an example of the functional configuration of the image display device according to the third embodiment. A block diagram showing an example of the functional configuration of the image display device according to the third embodiment. The figure which shows an example of the distribution of the estimated luminance which concerns on Example 3. The figure which shows an example of the composite image which concerns on Example 3. A block diagram showing an example of the functional configuration of the image display device according to the fourth embodiment. A block diagram showing an example of the functional configuration of the image display device according to the fifth embodiment. The figure which shows an example of the target luminance which concerns on Example 5. The figure which shows an example of the display image which concerns on Example 5.

<Example 1>
Hereinafter, the image display device according to the first embodiment of the present invention will be described. In the following, an example in which the image display device according to this embodiment is a transmissive liquid crystal display device will be described, but the image display device according to this embodiment is not limited to the transmissive liquid crystal display device. The image display device according to the present embodiment may be an image display device having a light emitting unit and a display unit that displays an image on the screen by modulating the light from the light emitting unit based on the image data. For example, the image display device according to this embodiment may be a reflective liquid crystal display device. Further, the image display device according to the present embodiment may be a MEMS shutter type display device using a MEMS (Micro Electro Mechanical System) shutter instead of the liquid crystal element.

The light emitting unit of the image display device according to the present embodiment has a plurality of light emitting regions corresponding to the plurality of divided regions constituting the screen region. The emission brightness of the plurality of emission regions can be controlled individually. By individually controlling the emission brightness of each light emitting region and correcting the input image data (image data input to the image display device), the image display device according to the present embodiment can be used in each of the plurality of divided regions. , Can be displayed in various dynamic ranges.

1A and 1B are block diagrams showing an example of the functional configuration of the image display device according to the present embodiment. In FIG. 1A, the image display device 1 according to this embodiment is used in an image display system including an information processing device 13. As the information processing device 13 which is an external device of the image display device 1, a workstation, a personal computer, a smartphone, or the like can be used.

In FIG. 1A, the range information and the area information are notified (input) from the information processing device 13 to the image display device 1 by the cooperation between the viewer application (viewer) mounted on the information processing device 13 and the image display device 1. ). The range information indicates a dynamic range (HDR; second dynamic range) wider than a predetermined reference dynamic range (SDR; first dynamic range). The area information indicates an image area (HDR area; selected area) to be displayed in HDR. HDR is, for example, the dynamic range desired by the user for the HDR region. The HDR area is, for example, an image area in which the user desires to display in HDR (HDR display).

Then, in FIG. 1A, the image display device 1 determines the division area corresponding to the HDR area as the HDR division area (corresponding division area). After that, the image display device 1 individually controls the emission brightness of each light emitting region so that the HDR display is performed in the HDR division region and the SDR display is performed in the non-HDR division region (non-corresponding division region). Correct the input image data. The non-HDR division area is a division area other than the HDR division area (other than the corresponding division area), and the SDR display is a display in SDR. As a result, the area where the HDR display is performed is limited to the HDR area, so that the power consumption of the image display device during the HDR display and the user's feeling of fatigue when checking the HDR display can be reduced.

Further, in FIG. 1A, the image display device 1 notifies the user of the area of the screen on which the HDR display is performed. As a result, the user can easily grasp the area where the HDR display is performed and the other area. As a result, it is possible to improve the convenience of checking the image quality of the display image (image displayed on the screen) in the area where the HDR display is performed and the image quality of the display image in the other areas.

In FIG. 1B, the image display device 1001 according to this embodiment further has the function of the information processing device 13 of FIG. 1A. Therefore, in FIG. 1B, the image display device 1001 acquires range information and area information in response to a user operation on the image display device 1001. For example, the image display device 1001 acquires range information according to a user operation for selecting HDR, or acquires area information according to a user operation for selecting an HDR area. The image display device 1001 may acquire at least one of range information and area information according to a user operation for setting an operation mode of the image display device 1001. As an input device that accepts user operations on the image display device 1001, a keyboard, a mouse, a special input device having a jog dial dedicated to image editing, a touch panel provided on the screen of the image display device 1001, and the like can be used.

In FIG. 1A, at least one of the range information and the area information does not have to be input from the information processing device 13 (external device) to the image display device 1. For example, the image display device 1
At least one of the range information and the area information may be acquired according to the user operation on the image display device 1.

The image display system of FIG. 1A will be described in detail below. Since the processing performed by the image display device 1001 of FIG. 1B is the same as the processing performed by the image display system of FIG. 1A, detailed description of the image display device 1001 of FIG. 1B will be omitted.

First, the image display device 1 will be described. The image display device 1 includes a liquid crystal panel unit 2, a BL module unit 3, a feature amount acquisition unit 4, a control unit 5, a BL brightness determination unit 6, a BL control value determination unit 7, a brightness estimation unit 8, and a correction parameter determination unit 9. It has a compositing unit 10, a gradation characteristic conversion unit 11, a brightness correction unit 12, and an image acquisition unit 18.

The liquid crystal panel unit 2 displays an image on the screen by transmitting (modulating) the light from the BL module unit 3 based on the image data. The liquid crystal panel unit 2 includes a liquid crystal panel having a plurality of liquid crystal elements, a liquid crystal driver for driving each liquid crystal element, and a control substrate for controlling the processing of the liquid crystal driver. The control board controls the processing of the liquid crystal driver based on the image data input to the liquid crystal panel unit 2. As a result, the transmittance of each liquid crystal element is controlled to a value corresponding to the image data input to the liquid crystal panel unit 2. The light from the BL module unit 3 passes through each liquid crystal element with a transmittance corresponding to the image data input to the liquid crystal panel unit 2. As a result, an image based on the image data input to the liquid crystal panel unit 2 is displayed on the screen.

The BL module unit 3 is a light emitting unit having a plurality of light emitting regions. The BL module unit 3 irradiates the back surface of the liquid crystal panel unit 2 (liquid crystal panel) with light. Each light emitting region emits light with a light emission brightness corresponding to the BL control value determined by the BL control value determination unit 7. Each light emitting region is provided with one or more light sources. The BL module unit 3 includes a plurality of light sources, a drive circuit for driving each light source, and an optical unit for diffusing light from each light source. In this embodiment, a plurality of divided regions are arranged in a matrix, and a plurality of light emitting regions are also arranged in a matrix. Specifically, the screen area is composed of 10 horizontal direction × 6 vertical direction divided areas, and the BL module unit 3 has 10 horizontal direction × 6 vertical direction light emitting areas. As the light source, for example, an LED (light emitting diode), an organic EL element, a cold cathode tube, or the like can be used.

In this embodiment, the screen area is composed of 1920 pixels in the horizontal direction and 1080 pixels in the vertical direction. Then, in this embodiment, the screen area is composed of a plurality of divided areas having the same size. As described above, in this embodiment, the screen area is composed of 10 horizontal direction × 6 vertical direction divided areas. Therefore, each divided region is composed of 192 pixels in the horizontal direction and 180 pixels in the vertical direction.

The size of the screen, the number of divided areas, the arrangement of the divided areas, the size of the divided areas, the number of light emitting areas, the arrangement of the light emitting areas, and the size of the light emitting areas are not particularly limited. The number of pixels constituting the area of the screen may be more or less than 1920 in the horizontal direction × 1080 in the vertical direction. The number of divided regions may be more or less than 60. A plurality of divided regions may be arranged in a houndstooth pattern. The sizes of the plurality of divided areas may be different from each other. The same applies to the light emitting region.

The image acquisition unit 18 acquires input image data (target image data that is image data to be displayed) from the information processing device 13. The image acquisition unit 18 outputs the acquired target image data to the feature amount acquisition unit 4 and the synthesis unit 10. In this embodiment, image data having a 12-bit RGB value (12-bit R value, 12-bit G value, and 12-bit B value) as pixel values is acquired as target image data. The data format of the target image data (number of bits of pixel value, type of pixel value, etc.) is not particularly limited. For example, image data having a 12-bit YDxDz value (12-bit Y value, 12-bit Dx value, and 12-bit Dz value) as pixel values may be acquired as target image data. Image data having a 10-bit YCbCr value (10-bit Y value, 10-bit Cb value, and 10-bit Cr value) as pixel values may be acquired as target image data.

The feature amount acquisition unit 4 acquires the luminance feature amount of the image data corresponding to the divided area for each of the plurality of divided areas from the target image data. The feature amount acquisition unit 4 outputs the brightness feature amount of each divided region to the BL brightness determination unit 6. The luminance feature quantity is a feature quantity related to luminance. In this embodiment, the maximum gradation value, which is the maximum value of the gradation values (R value, G value, and B value), is acquired as the luminance feature amount. For example, when the maximum value of the R value is 50, the maximum value of the G value is 1000, and the maximum value of the B value is 100, 1000 is acquired as the luminance feature amount.

FIG. 2A shows an example of the target image data, and FIG. 2B shows a luminance feature amount (maximum gradation value) obtained from the target image data of FIG. 2A. In FIG. 2B, the numerical values 1 to 10 arranged in the horizontal direction indicate the horizontal position (position in the horizontal direction) of the divided region, and the numerical values 1 to 6 arranged vertically indicate the vertical position of the divided region. (Position in the vertical direction) is shown. As described above, the gradation value of the target image data is a 12-bit value (0 to 4095). In FIG. 2A, the object 101 at the upper part of the screen is an object represented by high brightness. As shown in FIG. 2B, the luminance feature amount (maximum gradation value) of the divided region in which at least a part of the object 101 is displayed is 3100 or 3200.

The luminance feature amount is not limited to the maximum gradation value. For example, other representative values of gradation values (minimum value, average value, mode value, intermediate value, etc.) may be acquired as the luminance feature amount. A histogram of the gradation value may be acquired as a luminance feature amount. The number of pixels (bright portion pixels) having a gradation value larger than the threshold value may be acquired as the luminance feature amount. The number of pixels (dark area pixels) having a gradation value smaller than the threshold value may be acquired as the luminance feature amount. The luminance feature amount may be acquired by using the luminance value (Y value) as the gradation value.

The control unit 5 acquires range information from the information processing device 13 (first information acquisition). Further, the control unit 5 acquires the area information from the information processing device 13 (second information acquisition). Then, the control unit 5 detects the HDR divided area from the plurality of divided areas based on the area information. In this embodiment, the divided region in which at least a part of the HDR region is displayed is detected as the HDR divided region. The control unit 5 outputs the detection result of the HDR division region to the BL brightness determination unit 6, the correction parameter determination unit 9, the composition unit 10, and the gradation characteristic conversion unit 11. Further, the control unit 5 outputs the range information to the BL luminance determination unit 6, the correction parameter determination unit 9, and the gradation characteristic conversion unit 11.

FIG. 3A shows an example of the HDR region. In FIG. 3A, the region surrounded by the broken line 130 is the HDR region. In FIG. 3A, the area including the object 101 is designated as the HDR area. The image display device 1 cannot perform both SDR display and HDR display in one divided area. However, the HDR region may be designated without considering the split region. Therefore, the contour of the HDR region does not always correspond to the boundary between the plurality of divided regions. Therefore, the control unit 5 detects the divided region including at least a part of the HDR region as the HDR divided region.

The detection results of the HDR division region when the region surrounded by the broken line 130 in FIG. 3 (A) is the HDR region are shown in FIGS. 3 (B) and 3 (C). In FIG. 3B, the region surrounded by the broken line 131 indicates a region composed of a plurality of HDR divided regions. In FIG. 3C, the division area in which "1" is described is an HDR division area, and the division area in which "0" is described is a non-HDR division area. For example, the control unit 5 outputs information in which "0" or "1" is associated with each of the plurality of divided areas as the detection result of the HDR divided area.

The method for detecting the HDR division region is not limited to the above method. For example, a divided region including at least a part of the HDR region and a divided region adjacent thereto may be detected as the HDR divided region. A divided region containing at least a part of the HDR region may be detected as an HDR divided region. A divided region including at least a part of the HDR region and a divided region adjacent thereto may be detected as the HDR divided region.

The BL brightness determination unit 6 and the BL control value determination unit 7 individually control the emission brightness of each light emitting region. Then, the brightness estimation unit 8, the correction parameter determination unit 9, the gradation characteristic conversion unit 11, and the brightness correction unit 12 correct the target image data. In this embodiment, the emission brightness of each light emitting region is individually controlled and the target image data is corrected so that the SDR display is performed in the non-HDR divided region and the HDR display is performed in the HDR divided region. .. For this process, the luminance feature amount of each divided region, the range information, and the detection result of the HDR divided region are used. If the method uses the brightness feature amount of each divided region, the range information, and the detection result of the HDR divided region, any method can be used to individually control the emission brightness of each light emitting region and correct the target image data. May be done. In this embodiment, the emission brightness of each light emitting region is individually controlled based on the brightness feature amount of each divided region, the range information, and the detection result of the HDR divided region. Then, the target image data is corrected based on the range information, the detection result of the HDR divided region, and the emission brightness of each light emitting region.

The BL brightness determining unit 6 determines the emission brightness (target brightness) of each light emitting region based on the brightness feature amount of each divided region, the range information, and the detection result of the HDR divided region. The BL brightness determination unit 6 outputs information indicating the emission brightness of each light emitting region to the BL control value determination unit 7. In this embodiment, the BL brightness determining unit 6 determines the emission brightness of each of the plurality of light emitting regions based on the brightness feature amount of the divided region corresponding to the light emitting region. In determining the emission brightness, the first brightness range corresponding to SDR is used as the emission brightness range of the emission region corresponding to the non-HDR division region, and the emission brightness range of the emission region corresponding to the HDR split region. A second luminance range corresponding to HDR is used. For example, the BL luminance determination unit 6 provides information (BL conversion information; look-up table, function, etc.) indicating the correspondence between the luminance features and the emission luminance based on the range information and the detection result of the HDR division region. , Set or generate for each of the multiple light emitting regions. Then, the BL brightness determining unit 6 determines the emission brightness from the BL conversion information and the brightness feature amount for each of the plurality of light emitting regions. Specifically, the BL brightness determining unit 6 determines the emission brightness corresponding to the brightness feature amount of the light emitting region (divided region) as the emission brightness of the light emitting region in the correspondence relationship indicated by the BL conversion information.

In this embodiment, an example in which the ratio of the first luminance range and the second luminance range matches the ratio of HDR and SDR will be described. In this embodiment, an example will be described in which the minimum luminance in the first luminance range matches the minimum luminance in the second luminance range, and the minimum luminance in the SDR matches the minimum luminance in the HDR. Specifically, the minimum luminance in the first luminance range, the minimum luminance in the second luminance range, the minimum luminance in SDR, and the minimum luminance in HDR correspond to the lower limit of the gradation value of the image data. An example of a match will be described. However, the ratio of the first luminance range to the second luminance range may be different from the ratio of HDR to SDR. The minimum luminance in the first luminance range may be different from the minimum luminance in the second luminance range. The minimum brightness of SDR may be different from the minimum brightness of HDR. At least one of the minimum luminance in the first luminance range, the minimum luminance in the second luminance range, the minimum luminance in SDR, and the minimum luminance in HDR is different from the luminance corresponding to the lower limit of the gradation value of the image data. You may be.

An example of the correspondence relationship shown by the BL conversion information is shown in FIGS. 4 (A) and 4 (B). The horizontal axis of FIGS. 4 (A) and 4 (B) indicates the maximum gradation value which is the luminance feature amount, and the vertical axis of FIGS. 4 (A) and 4 (B) indicates the emission luminance. The emission brightness of 0% corresponds to a state in which the light emission region is not lit, and the emission brightness of 100% corresponds to a state in which the light emission region is lit at the upper limit emission brightness. The emission brightness of the emission region corresponding to the non-HDR division region is determined according to the correspondence relationship shown in FIG. 4 (A). The emission brightness of the emission region corresponding to the HDR division region is determined according to the correspondence relationship shown in FIG. 4 (B).

In this embodiment, SDR is range 0~200cd / ^{m 2,} and, HDR is assumed to be the range of 0~2000cd / ^{m 2.} As will be described in detail later, the gradation value corresponding to the maximum brightness of SDR is 1803, and the gradation value corresponding to the maximum brightness of HDR is 3141. In FIG. 4A, the emission luminance range (first luminance range) is in the range of 0 to 10%. In FIG. 4B, the emission luminance range (second luminance range) is in the range of 0 to 100%. As described above, in this embodiment, the ratio of the first luminance range to the second luminance range (10/100) coincides with the ratio of SDR to HDR (200/2000).

In FIGS. 4 (A) and 4 (B), with respect to the maximum gradation value equal to or less than the gradation value corresponding to the maximum brightness of the SRD, as the maximum gradation value increases, the minimum brightness in the first luminance range is changed to the first. Emission brightness that increases up to the maximum brightness in the brightness range of 1 is associated. Specifically, the emission brightness that increases from 0% to 10% as the maximum gradation value increases is associated with the maximum gradation value of 1803 or less. Then, in FIG. 4A, the same emission brightness as the maximum brightness of the first brightness range is associated with the maximum gradation value larger than the gradation value corresponding to the maximum brightness of SDR. Specifically, 10% emission brightness is associated with a maximum gradation value larger than 1803.

In FIG. 4B, the maximum gradation value is increased with respect to the maximum gradation value which is equal to or more than the gradation value corresponding to the maximum brightness of SDR and is equal to or less than the gradation value corresponding to the maximum brightness of HDR. The emission brightness that increases with this is associated. Specifically, as the maximum gradation value increases, the emission luminance that increases from the maximum luminance in the first luminance range to the maximum luminance in the second luminance range is associated. More specifically, the emission brightness that increases from 10% to 100% as the maximum gradation value increases is associated with the maximum gradation value that is 1083 or more and 3141 or less. Then, in FIG. 4B, the same emission brightness as the maximum brightness of the second brightness range is associated with the maximum gradation value larger than the gradation value corresponding to the maximum brightness of HDR. Specifically, 100% emission brightness is associated with the maximum gradation value larger than 4095.

Although FIGS. 4 (A) and 4 (B) show a correspondence relationship in which linear characteristics are connected as a correspondence relationship between the maximum gradation value and the emission brightness, the correspondence between the maximum gradation value and the emission brightness is shown. The relationship is not limited to the correspondence shown in FIGS. 4 (A) and 4 (B). For example, in at least a part of the range of the maximum gradation value, the emission brightness may increase exponentially as the maximum gradation value increases. The correspondence between the maximum gradation value and the emission brightness may be determined in consideration of the correspondence between the brightness of the dynamic range and the gradation value (the correspondence between the display brightness (screen brightness) and the gradation value).

An example will be described when the maximum gradation value shown in FIG. 2B is obtained as the maximum gradation value of each divided region. When the HDR region does not exist, as shown in FIG. 5A, all the divided regions are set as non-HDR divided regions. In FIG. 5A, the division area marked with “0” is a non-HDR division area. Therefore, the emission brightness of all the emission regions is determined according to the correspondence relationship shown in FIG. 4 (A). As a result, the emission brightness shown in FIG. 5B is obtained as the emission brightness of each light emission region.

When the result shown in FIG. 3C is obtained as the detection result of the HDR division region, FIG. 3 (
The light emitting region corresponding to the divided region surrounded by the thick line in C) is determined according to the correspondence relationship in FIG. 4 (B). Specifically, (horizontal position, vertical position) = (7,1) to (7,3), (8,1) to (8,3), and (9,1) to (9,3). The emission brightness of the nine light emitting regions of is determined according to the correspondence relationship of FIG. 4 (B). Then, the emission brightness of the remaining light emission region is determined according to the correspondence relationship of FIG. 4 (A). As a result, the emission brightness shown in FIG. 5C is obtained as the emission brightness of each light emission region.

The BL control value determination unit 7 converts the emission brightness (target brightness) of each light emitting region determined by the BL brightness determination unit 6 into a BL control value. The BL control value determination unit 7 outputs the BL control value of each light emitting region to the BL module unit 3. As a result, each light emitting region emits light with the light emission brightness determined by the BL brightness determination unit 6. Further, the BL control value determination unit 7 also outputs the BL control value of each light emitting region to the luminance estimation unit 8. When the emission brightness of the light source in the emission region is controlled by the pulse width modulation method, a value indicating the pulse width is used as the BL control value. When the emission brightness of the light source in the emission region is controlled by the pulse amplitude modulation method, a value indicating the pulse amplitude is used as the BL control value. When the emission brightness is controlled by a method of modulating both the pulse width and the pulse amplitude, a value indicating the pulse width and the pulse amplitude is used as the BL control value.

The synthesizing unit 10 represents a first graphic image based on the detection result of the HDR division region so that the first graphic image is further displayed in addition to the image based on the corrected target image data. The graphic image data is combined (first composition). As a result, composite image data is generated by synthesizing the first graphic image data with the target image data. The first graphic image is a graphic image showing an area (HDR display area) of the screen on which the display is performed in HDR. For example, the first graphic image is an image (rectangular frame image) as shown by the broken line 131 in FIG. 3 (B). By displaying the first graphic image, the HDR display area is notified to the user. In other words, the user can grasp the HDR display area by checking the displayed first graphic image. The compositing unit 10 outputs the composite image data to the gradation characteristic conversion unit 11. The synthesis unit 10 may be omitted.

The gradation characteristic conversion unit 11 performs conversion processing for converting the gradation characteristics of image data based on the range information and the detection result of the HDR division region. By the conversion process, the gradation characteristics of the image data corresponding to the non-HDR divided region are converted so that the range of the display luminance corresponding to the range of the gradation value of the image data matches the SDR. Further, the conversion process converts the gradation characteristics of the image data corresponding to the HDR division region so that the display brightness range corresponding to the gradation value range of the image data matches the HDR. In this embodiment, the composite image data is converted. As a result, converted image data is generated. The gradation characteristic conversion unit 11 outputs the converted image data to the luminance correction unit 12.

Specific examples of the conversion process will be described with reference to FIGS. 6 (A) to 6 (C). The vertical axis of FIGS. 6 (A) to 6 (C) indicates the brightness, and the horizontal axis of FIGS. 6 (A) to 6 (C) indicates the gradation value. FIG. 6A shows the correspondence between the gradation value and the brightness (display brightness). The correspondence between the gradation value and the brightness is not limited to the correspondence in FIG. 6A.

In this embodiment, the maximum brightness of the SDR is 200 cd / m ² . As shown in FIG. 6B, the gradation value corresponding to 200 cd / m ² is 1803. In the conversion process, when the gradation value of the image data corresponding to the non-HDR division region is larger than 1803, the gradation value is converted to 1803. That is, the upper limit of the gradation value of the image data corresponding to the non-HDR divided region is limited to 1803. After that, the range of gradation values of the image data corresponding to the non-HDR divided region is expanded from the range of 0 to 1803 to the range of the original range (0 to 4095).

Further, in this embodiment, the maximum brightness of HDR is 2000 cd / m ² . As shown in FIG. 6C, the gradation value corresponding to 2000 cd / m ² is 3141. In the conversion process, when the gradation value of the image data corresponding to the HDR division region is larger than 3141, the gradation value is converted to 3141. That is, the upper limit of the gradation value of the image data corresponding to the HDR division region is limited to 3141. After that, the range of the gradation value of the image data corresponding to the HDR division region is expanded from the range of 0 to 3141 to the range of the original range (0 to 4095).

The brightness estimation unit 8, the correction parameter determination unit 9, and the brightness correction unit 12 correct the gradation value of the image data based on the range information, the detection result of the HDR division region, and the emission brightness of each light emission region. Correction processing is performed. In the correction process, the display with the same brightness as when the irradiation brightness matches the maximum brightness of SDR is performed in the non-HDR division region, and the display with the same brightness as when the irradiation brightness matches the maximum brightness of HDR is displayed. This is a process for correcting the gradation value so that it is performed in the HDR division region. The irradiation brightness is the brightness of the light emitted from the BL module unit 3 and applied to the liquid crystal panel unit 2.

The brightness estimation unit 8 estimates the irradiation brightness based on the emission brightness (BL control value) of each light emission region. The brightness estimation unit 8 outputs the estimation result of the irradiation brightness to the correction parameter determination unit 9. In this embodiment, an attenuation coefficient indicating the attenuation of the light when the light emitted from the light emitting region is diffused is stored in advance in a memory (not shown). The brightness estimation unit 8 performs a process of multiplying the emission brightness (BL control value) by the attenuation coefficient corresponding to the position in the screen (estimated position for which the irradiation brightness is estimated) for each light emitting region. Then, the brightness estimation unit 8 calculates the sum of the multiplication results of each light emitting region as the irradiation brightness. Irradiance brightness may be estimated by the above method for all positions on the screen, but the amount of calculation becomes enormous. Therefore, in this embodiment, the irradiation brightness is estimated by the above method for a part of the position on the screen. Specifically, the center position of each divided region is used as the estimated position.

The attenuation coefficient may be appropriately changed according to the deterioration state of the light source, the temperature inside the image display device 1, the temperature outside the image display device 1, user operation, and the like. A position different from the center position of the divided region may be used as the estimated position. The method of estimating the irradiation brightness is not particularly limited. The image display device 1 may have an optical sensor that detects light from the BL module unit 3. Then, the irradiation brightness may be estimated based on the detection result of the optical sensor.

The correction parameter determination unit 9 determines, for each position on the screen, a correction parameter for correcting the image data corresponding to that position. The correction parameter determination unit 9 determines a correction parameter for suppressing a change in display brightness due to a change in irradiation brightness from the maximum brightness of SDR with respect to a position in the non-HDR division region. Then, the correction parameter determination unit 9 determines the correction parameter for suppressing the change in the display brightness due to the change in the irradiation brightness from the maximum brightness of the HDR with respect to the position in the HDR division region. The correction parameter determination unit 9 outputs the correction parameter of each position to the luminance correction unit 12.

The correction parameter determination unit 9 determines the correction parameter of the estimated position based on the irradiation brightness of the estimated position, the detection result of the HDR division region, and the range information. Here, consider the case where the correspondence between the gradation value and the brightness is indicated by the gamma curve of the gamma value G. In this case, the correction coefficient to be multiplied by the gradation value can be determined as the correction parameter by using the following equation 1. In Equation 1, Lpn is the estimated irradiance, Lt is the maximum brightness of the dynamic range, and Ppn is the correction coefficient. When calculating the correction coefficient Ppn of the estimated position in the non-HDR division region, the maximum brightness of SDR is used as the maximum brightness Lt. When calculating the correction coefficient Ppn of the estimated position in the HDR division region, the maximum brightness of HDR is used as the maximum brightness Lt.

Ppn = (Lt / Lpn) ^{1 / G} ... (Equation 1)

The correction parameter determination unit 9 calculates correction parameters for positions other than the estimated position by interpolation processing using the correction parameters of the estimated position.

The irradiance for a position other than the estimated position may be calculated by interpolation processing using the irradiance of the estimated position, and the correction parameters may be calculated by the same method for all the positions. Further, the method of determining the correction parameter is not particularly limited. As a method for determining the correction parameter, various conventional techniques for suppressing a change in display brightness due to a change in irradiation brightness can be used.

The luminance correction unit 12 corrects each gradation value of the converted image data by using the correction parameter determined by the correction parameter determination unit 9. As a result, corrected image data is generated. The brightness correction unit 12 outputs the corrected image data to the liquid crystal panel unit 2.

Next, the information processing device 13 will be described. The information processing device 13 includes a network I / F unit 14, a viewer 15, a data input / output unit 16, and an operation unit 17.

The operation unit 17 receives a user operation on the information processing device 13. As the operation unit 17, a keyboard, a mouse, a special input device having a jog dial dedicated to image editing, and the like can be used. The user operation is performed using, for example, a GUI image (menu image, etc.) displayed on the image display device 1.

The network I / F unit 14 is connected to a network (not shown). The network I / F unit 14 acquires the edited image data from a server (not shown) via the network, and outputs the acquired edited image data to the viewer 15. The edited image data is the target of editing. For example, an instruction to acquire edited image data is sent from the viewer 15 to the network I / F unit 14 in response to a user operation on the information processing device 13, and the network I / F unit 14 sends the network I / F unit 14 in response to the instruction from the viewer 15. Get the edited image data from. The user operation for the information processing device 13 is, for example, a user operation for selecting edited image data from a plurality of image data. The method of acquiring the edited image data is not limited to the above method. For example, the image data may be read out as edited image data from the storage device provided in the information processing device 13. The storage device may or may not be detachable from the information processing device 13.

The viewer 15 generates viewer image data (target image data) representing the viewer image, and outputs the viewer image data to the data input / output unit 16. The viewer image is, for example, an image in which an image before editing, a GUI image (command image) for editing, a time code, an image after editing, and the like are arranged. An example of the viewer image is shown in FIG. When the user operation using the GUI image of FIG. 7 is performed, the viewer 15 acquires a signal corresponding to the user operation from the operation unit 17, and performs processing according to the acquired signal. As a result, selection of target image data, color change, gamma value change, HDR setting, HDR area setting, saving of edited image, and the like are realized. The target image data is not limited to the viewer image data. As shown in FIG. 2A, the GUI image and the time code may not be arranged in the image represented by the target image data. In FIG. 7, the broken line shown in the edited image indicates the HDR region. When the HDR and HDR areas are set, the viewer 15 outputs the range information and the area information to the data input / output unit 16.

The data input / output unit 16 outputs viewer image data (target image data) to the image display device 1 (image output). The data input / output unit 16 outputs range information to the image display device 1 (first information output). Then, the data input / output unit 16 outputs the area information to the image display device 1 (second information output). The range information and the area information may be output as metadata of the image data, or may be output as data different from the image data. The data input / output unit 16 can also acquire various information from the image display device 1 (control unit 5). For example, the data input / output unit 16 can acquire information such as the position, size, number, and the like of the light emitting region of the image display device 1 from the image display device 1. The transmission method of the range information, the area information, the information of the image display device 1, and the like is not particularly limited. When the transmission method of the DisplayPort standard is used, these information can be transmitted by using the AUX channel defined by the DisplayPort standard. This information may be transmitted using USB (universal serial bus) or the like.

As described above, according to the present embodiment, since the area where the HDR display is performed is limited to the HDR division area, the power consumption of the image display device at the time of HDR display and the user at the time of confirming the HDR display It is possible to reduce the feeling of fatigue. In addition, the user is notified of the area of the screen on which the HDR display is performed. As a result, the user can easily grasp the area where the HDR display is performed and the other area. As a result, it is possible to improve the convenience of the confirmation work of the image quality of the display image in the area where the HDR display is performed and the image quality of the display image in the other areas.

In this embodiment, an example in which the HDR region is a rectangular region has been described, but the shape of the HDR region is not limited to a rectangle. A recess or a curved portion may be present in a part of the contour of the HDR region. Further, in this embodiment, an example in which the area information indicates one area (HDR area) has been described, but the area information may indicate a plurality of areas. In that case, the dynamic range may be different between the plurality of areas indicated by the area information.

<Example 2>
Hereinafter, the image display device according to the second embodiment of the present invention will be described. In the following, the configurations and processes different from those of the first embodiment will be described in detail, and the description of the same configurations and processes as in the first embodiment will be omitted.

In the first embodiment, the emission brightness of the light emitting region may be significantly different between the divided regions. For example, the emission brightness of the light emitting region may be significantly different between the HDR divided region and the non-HDR divided region. Such a large difference in emission brightness causes halo generation, flicker generation when displaying a moving image, and the like. Therefore, in this embodiment, a spatial low-pass filter process (spatial LPF process; smoothing process) is performed to smooth the distribution of the emission luminance in the plurality of emission regions.

8A and 8B are block diagrams showing an example of the functional configuration of the image display device according to the present embodiment. In FIG. 8A, the image display device 100 according to this embodiment is used in an image display system including an information processing device 13. In FIG. 8B, the image display device 1002 according to this embodiment further has the function of the information processing device 13 of FIG. 8A.

The image display system of FIG. 8A will be described in detail below. Since the processing performed by the image display device 1002 of FIG. 8B is the same as the processing performed by the image display system of FIG. 8A, detailed description of the image display device 1002 of FIG. 8B will be omitted. As shown in FIG. 8A, the image display device 100 has a plurality of functional units included in the image display device 1 of the first embodiment and an LPF processing unit 102.

The control unit 5 acquires range information, acquires area information, and detects the HDR division area, as in the first embodiment. Then, the control unit 5 outputs the range information to the BL luminance determination unit 6, the correction parameter determination unit 9, and the gradation characteristic conversion unit 11 as in the first embodiment. However, in this embodiment, the control unit 5 outputs the detection result of the HDR division region to at least the BL brightness determination unit 6. Although the details will be described later, in this embodiment, the emission brightness of each light emitting region determined by the BL brightness determination unit 6 is corrected by the LPF processing unit 102. The control unit 5 acquires the corrected luminance (corrected emission luminance) of each emission region from the LPF processing unit 102, and corrects the detection result of the HDR division region based on the correction luminance of each emission region. Then, the control unit 5 outputs the correction result (detection result after correction) of the HDR division region to the correction parameter determination unit 9, the composition unit 10, and the gradation characteristic conversion unit 11. As a result, the correction parameter determination unit 9, the composition unit 10, and the gradation characteristic conversion unit 11 use the corrected detection result as the detection result of the HDR division region, and perform the same processing as in the first embodiment.

In this embodiment, the detection result of the HDR divided region is performed so that the target image data is corrected by using the divided region corresponding to the light emitting region whose corrected brightness is the brightness outside the first luminance range as the HDR divided region. Is corrected. That is, HDR is set so that the divided region corresponding to the light emitting region whose correction brightness is the brightness outside the first luminance range is set as the HDR divided region and the remaining divided region is set as the non-HDR divided region. The detection result of the divided area is corrected.

An example will be described in which the non-correction result (detection result before correction) of the HDR division region is the result shown in FIG. 3C and the correction brightness is the emission brightness shown in FIG. Similar to Example 1, the maximum luminance of the first luminance range is 20%. In FIG. 9, (6,1) to (6,4), (7,1) to (7,4), (8,1) to (8,4), (9,1) to (9,4) ), And the emission brightness of the 20 light emitting regions of (10, 1) to (10, 4) exceeds 20%. Therefore, the detection result of the HDR divided region is corrected so that the divided region corresponding to these 20 light emitting regions is set as the HDR divided region and the remaining divided region is set as the non-HDR divided region. The divided regions corresponding to the above 20 light emitting regions are (6,1) to (6,4), (7,1) to (7,4), (8,1) to (8,4), ( There are 20 divided regions of 9,1) to (9,4) and (10,1) to (10,4). In FIG. 3C, nine divided regions (7,1) to (7,3), (8,1) to (8,3), and (9,1) to (9,3) Is set as the HDR division area, and the remaining division area is set as the non-HDR division area. Therefore, by correcting the detection result, (6,1) to (6,4), (7,4), (8,4), (9,4), (10,1) to (10,4) Eleven division areas are changed from non-HDR division areas to HDR division areas.

The correction of the detection result of the HDR division region may be omitted. However, if the HDR division region is corrected by the above method, the region where the HDR display is performed can be expanded by effectively utilizing the light from the BL module unit 3. As a result, it is possible to provide the user with a higher quality image. Further, the threshold value for whether or not to set as the HDR division region is not limited to the maximum brightness and the minimum brightness in the first luminance range.

The BL brightness determining unit 6 determines the emission brightness of each light emitting region in the same manner as in the first embodiment. However, in this embodiment, the BL brightness determination unit 6 outputs information indicating the emission brightness of each light emitting region to the LPF processing unit 102 instead of the BL control value determination unit 7.

The LPF processing unit 102 performs spatial LPF processing on the emission brightness of each light emitting region determined by the BL brightness determination unit 6. As a result, the emission brightness of each emission region is corrected. The LPF processing unit 102 outputs information indicating the corrected luminance (corrected luminous luminance) of each light emitting region to the control unit 5 and the BL control value determining unit 7.

An example of spatial LPF processing will be described. First, the LFP processing unit 102 detects the light emitting region Max (N) having the highest emission brightness from a plurality of light emitting regions existing around the target light emitting region N. For example, the light emitting region existing around the target light emitting region N is a light emitting region whose distance from the target light emitting region N is equal to or less than the threshold value. In this embodiment, the light emitting region Max (N) is detected from a plurality of light emitting regions adjacent to the target light emitting region N. As the threshold value, a value corresponding to two or more light emitting regions may be used. That is, a light emitting region outside the light emitting region adjacent to the target light emitting region N may be further used as a light emitting region existing around the target light emitting region N.

Next, the LPF processing unit 102 compares the emission luminance L (N) of the target emission region N with the value obtained by multiplying the emission luminance L (Max (N)) of the emission region Max (N) by the coefficient α. When α × L (Max (N)) is higher than L (N), the LPF processing unit 102 changes the emission brightness of the target light emitting region N from L (N) to α × L (Max (N)). replace. When α × L (Max (N)) is L (N) or less, the LPF processing unit 102 does not replace the emission luminance of the target emission region N.

The LPF processing unit 102 selects each of the plurality of light emitting regions as the target light emitting region N, and performs the above-described processing. When α = 0.5, the distribution shown in FIG. 5C is corrected to the distribution shown in FIG.

The coefficient α may be larger or smaller than 0.5. The coefficient α may be determined or changed based on the degree of diffusion of light from the light emitting region, the amount of fluctuation in the light emission brightness in the light emitting region, and the like. Further, the spatial LPF processing is not limited to the above processing. As the spatial LPF processing, various conventional techniques for smoothing the distribution of values can be used.

As described above, also in this embodiment, the area where the HDR display is performed is limited to the HDR division area. Therefore, it is possible to reduce the power consumption of the image display device at the time of HDR display and the feeling of fatigue of the user when confirming the HDR display. In addition, the user is notified of the area of the screen on which the HDR display is performed. As a result, the user can easily grasp the area where the HDR display is performed and the other area. Further, according to this embodiment, the distribution of emission luminance in a plurality of emission regions is smoothed. As a result, deterioration of the image quality of the displayed image (generation of halo, occurrence of flicker when displaying a moving image, etc.) can be suppressed.

<Example 3>
Hereinafter, the image display device according to the third embodiment of the present invention will be described. In the following, the configurations and processes different from those of the first embodiment will be described in detail, and the description of the same configurations and processes as in the first embodiment will be omitted. Hereinafter, an example in which the characteristic configuration of the present embodiment is applied to the configuration of the first embodiment will be described, but the characteristic configuration of the present embodiment can also be applied to the configuration of the second embodiment.

In the first and second embodiments, the user is notified of the area of the screen on which the HDR display is performed. However, the light from each light emitting region is diffused to the surroundings. Therefore, in the region around the region where the HDR display is performed, the irradiation brightness may be controlled to a brightness that greatly exceeds the irradiation brightness when the HDR display is not performed. As a result, accurate brightness (desired brightness) may not be displayed in the area around the area where HDR display is performed. In particular, there is a high possibility that low gradation values cannot be displayed with accurate brightness. Therefore, in this embodiment, the user is notified of an area (affected area) that is likely to be unable to be displayed with accurate brightness. As a result, the user can easily grasp the affected area, and it is possible to prevent the user from misunderstanding that the brightness of the affected area is an accurate brightness.

10A and 10B are block diagrams showing an example of the functional configuration of the image display device according to the present embodiment. In FIG. 10A, the image display device 200 according to this embodiment is used in an image display system including an information processing device 13. In FIG. 10B, the image display device 1003 according to this embodiment further has the function of the information processing device 13 of FIG. 10A.

The image display system of FIG. 10A will be described in detail below. Since the processing performed by the image display device 1003 of FIG. 10B is the same as the processing performed by the image display system of FIG. 10A, detailed description of the image display device 1003 of FIG. 10B will be omitted. As shown in FIG. 10A, the image display device 200 has a plurality of functional units included in the image display device 1 of the first embodiment and a high-luminance region detection unit 201.

The high-luminance region detection unit 201 acquires the estimation result of the irradiation brightness from the brightness estimation unit 8 and detects the region of the screen whose irradiation brightness is equal to or higher than the threshold value as the high-luminance region. The high-luminance region detection unit 201 outputs the detection result of the high-luminance region to the control unit 5. FIG. 11 shows an example of the estimated distribution of irradiance. The horizontal axis of FIG. 11 indicates the horizontal position, and the vertical axis of FIG. 11 indicates the irradiation brightness. The black circle in FIG. 11 indicates the irradiance at the estimated position, and the broken line in FIG. 11 indicates the interpolation result of the irradiance at the estimated position. Here, for simplification of the description, a method of detecting a high-luminance region will be described using the irradiation brightness distribution in the horizontal direction. When the threshold value is 200, five divided regions having horizontal positions of 6 to 10 are detected as high-luminance regions.

The threshold value to be compared with the irradiation brightness may be a fixed value predetermined by the manufacturer or a value that can be changed by the user. The threshold value may be automatically determined according to the type of the target image data, the usage environment of the image display device (ambient brightness, etc.), and the like. When the individual control (local deming process) of each light emitting region is not performed, the light emitting brightness of all the light emitting regions is controlled to the reference brightness. As the threshold value to be compared with the irradiation brightness, the irradiation brightness when the emission brightness of all the light emitting regions is controlled to the reference brightness may be used. The maximum brightness of the first brightness range may be used as the threshold value to be compared with the irradiation brightness. The maximum value of the irradiance that can be taken when the local deming process is performed so as to be displayed in SDR may be used as a threshold value to be compared with the irradiance.

The control unit 5 performs the same processing as in the first embodiment. Further, the control unit 5 acquires the detection result of the high-luminance region from the high-luminance region detection unit 201. Then, the control unit 5 detects the region excluding the corresponding division region from the high-luminance region as the influence region, and outputs the detection result of the influence region to the synthesis unit 10. For example, in FIG. 11, consider the case where the five divided regions having horizontal positions 6 to 10 are high-luminance regions and the three divided regions having horizontal positions 7 to 9 are HDR divided regions. In this case, the control unit 5 outputs information indicating three divided regions having horizontal positions of 7 to 9 as the detection result of the HDR divided region, and two horizontal positions of 6 and 10 as the detection result of the affected region. Outputs information indicating the divided area.

The synthesis unit 10 performs the first synthesis and the second synthesis. The first composition represents a first graphic image based on the detection result of the HDR divided region so that the first graphic image is further displayed in addition to the image based on the corrected target image data. It is a process of synthesizing the graphic image data of. The second composition represents a second graphic image based on the detection result of the affected area so that the second graphic image is further displayed in addition to the image based on the corrected target image data. This is a process for synthesizing graphic image data. As a result, composite image data is generated by synthesizing the first graphic image data and the second graphic image data with the target image data. The compositing unit 10 outputs the composite image data to the gradation characteristic conversion unit 11. The first synthesis may be omitted.

The first graphic image is a graphic image showing an HDR display area, and the second graphic image is an image showing an affected area. FIG. 12 shows an example of an image (composite image) based on the composite image data. In FIG. 12, the broken line 301 is the first graphic image, and the hatched image 302 is the second graphic image. By displaying the first graphic image, the HDR display area is notified to the user, and by displaying the second graphic image, the affected area is notified to the user. In other words, the user can grasp the HDR display area by checking the displayed first graphic image, and grasp the affected area by checking the displayed second graphic image. be able to.

The irradiance is estimated based on the irradiance (BL control value) of each light emitting region, and the affected area is detected based on the detection result of the HDR division region and the estimated distribution of the irradiance. Therefore, the second composition can be said to be "a process of synthesizing the second graphic image data based on the detection result of the HDR divided region and the emission brightness of each light emitting region".

The first graphic image and the second graphic image are not limited to the image shown in FIG. Any image may be used as the first graphic image as long as the HDR display area can be notified to the user. Any image may be used as the second graphic image as long as the affected area can be notified to the user. For example, a message image indicating the HDR display area may be used as the first graphic image. Specifically, message images such as "HDR display is performed on the right half surface" and "The start point coordinates of the HDR display area are A and the end point coordinates are B" are used as the first graphic image. You may. A graphic image that means a screen and in which the area corresponding to the HDR display area is distinguished from other areas may be used as the first graphic image. A message image showing the affected area may be used as the second graphic image. A graphic image that means a screen and whose area corresponding to the affected area is distinguished from other areas may be used as the second graphic image. An image having a predetermined transparency and a predetermined color may be used as a second graphic image superimposed on the affected area.

As described above, according to the present embodiment, the affected area is notified to the user. As a result, the user can easily grasp the affected area, and it is possible to prevent the user from misunderstanding that the brightness of the affected area is an accurate brightness.

<Example 4>
Hereinafter, the image display device according to the fourth embodiment of the present invention will be described. In the following, configurations and processes different from those of Examples 1 to 3 will be described in detail, and description of the same configurations and processes as those of Examples 1 to 3 will be omitted.

In the first to third embodiments, the region in which the user desires the HDR display is designated, the emission brightness of the light emitting region corresponding to the designated region is controlled to be higher than the emission brightness of the other light emitting regions, and the HDR display is displayed. Notified the user of the area to be done. Here, the "other light emitting area" is a "light emitting area corresponding to the SDR display area (area other than the designated area; the area where the SDR display is performed)".

In this embodiment, an area to be displayed in HDR (referred to as an “HDR recommended area” in this embodiment) is detected from the feature amount of the input image data, and the HDR recommended area is notified to the user. Then, after the HDR recommended area is notified, when the user is instructed to execute the HDR display in the HDR recommended area, the HDR display is performed in the HDR recommended area. The instruction to execute the HDR display in the HDR recommended area is received via the user I / F unit (user interface unit). This makes it possible for the user to prevent the user from overlooking the confirmation of the HDR display image (display image in the area where the HDR display is performed), and the display image when the HDR display and the SDR display are mixed on one screen. The convenience of image quality confirmation work can be improved.

FIG. 13 is a block diagram showing an example of the functional configuration of the image display device 300 according to the present embodiment. As shown in FIG. 13, the image display device 300 includes a plurality of functional units, an HDR recommended area detection unit 301, and a user I / F unit 302 included in the image display device 1 of the first embodiment.

The HDR recommended area detection unit 301 detects a divided area including HDR pixels as an HDR recommended area (specific area) from a plurality of divided areas based on the luminance feature amount of each divided area. Then, the HDR recommended area detection unit 301 outputs the detection result of the HDR recommended area to the control unit 5. The "HDR pixel" is a "pixel having an HDR (second dynamic range)". The "division area including the HDR pixel" is a "division area corresponding to the image data including the HDR pixel". The "divided area including HDR pixels" can also be referred to as a "divided area in which HDR pixels exist".

In this embodiment, the maximum gradation value is used as the luminance feature amount. The HDR recommended area detection unit 301 receives information on the gradation value (boundary gradation value) corresponding to the boundary between the SDR and the range of gradation values that do not belong to the SDR and belong to the HDR from the control unit 5. HDR, boundary gradation value, etc. are defined according to, for example, the format of input image data. The HDR recommended area detection unit 301 compares the luminance feature amount (maximum gradation value) of each divided area with the acquired boundary gradation value. Then, the HDR recommended area detection unit 301 determines a divided area in which the luminance feature amount (maximum gradation value) is larger than the boundary gradation value as the HDR recommended area.

The luminance feature amount is not limited to the maximum gradation value. For example, a histogram of gradation values may be used as a luminance feature amount. When the histogram is used, the divided region having the largest number of HDR pixels among the plurality of divided regions may be detected as the HDR recommended region. All the divided regions in which the number of HDR pixels included is a predetermined number or more may be detected as the HDR recommended region. A divided region in which the distance from the HDR recommended region is equal to or less than the threshold value and includes HDR pixels may be further detected as the HDR recommended region. For example, a divided region adjacent to the HDR recommended region and including the HDR pixel may be further detected as the HDR recommended region.

The user I / F unit 302 receives a user operation (instruction from the user). Then, the user I / F unit 302 outputs the information according to the instruction from the user to the control unit 5. For example, the user I / F unit 302 receives an instruction regarding the range information from the user and outputs the range information to the control unit 5. The "instruction regarding range information" is, for example, "designation of HDR".

The control unit 5 of this embodiment acquires range information from the user I / F unit 302, acquires the luminance feature amount of each divided region from the feature amount acquisition unit 4, and acquires the brightness feature amount of each divided region from the HDR recommended area detection unit 301 to the HDR recommended area. Get the detection result. Then, the control unit 5 notifies the synthesis unit 10 of the detection result of the HDR recommended area (coordinates of the HDR recommended area, etc.) in order to notify the user of the HDR recommended area. The compositing unit 10 synthesizes graphic image data representing the graphic image so that the detection result of the HDR recommended region is displayed as a graphic image. For example, the graphic image data is combined with the target image data (input image data) before correction. As a result, composite image data is generated by synthesizing graphic image data with the target image data before correction. Then, the synthesis unit 10 outputs the composite image data to the gradation characteristic conversion unit 11.

The image data to which the graphic image data is combined is not particularly limited. Graphic image data may be combined with the target image data after being corrected so that the SDR display is performed on the entire screen.

The graphic image is, for example, an image (rectangular frame image) as shown by the broken line 131 in FIG. 3 (B). By displaying the graphic image, the user is notified of the HDR recommended area. In other words, the user can grasp the HDR recommended area, the presence or absence of the HDR recommended area, and the like by checking the displayed graphic image.

After the graphic image is displayed, the user can instruct the image display device 300 (user I / F unit 302) whether or not to perform HDR display in the HDR recommended area. The "instruction regarding whether or not to perform HDR display in the HDR recommended area" is "instruction to perform HDR display in the HDR recommended area", "instruction not to perform HDR display in the HDR recommended area", and the like. It should be noted that one of the instruction to display the HDR in the HDR recommended area and the instruction not to display the HDR in the HDR recommended area may not be positively given. When the instruction not to display HDR in the HDR recommended area is not given, it may be determined that the instruction not to perform HDR display is given in the HDR recommended area. When the instruction not to perform the HDR display is given in the HDR recommended area, it may be determined that the instruction to perform the HDR display is given in the HDR recommended area.

When an instruction as to whether or not to perform HDR display is given in the HDR recommended area, the information corresponding to the instruction is output from the user I / F unit 302 to the control unit 5. The control unit 5 determines whether or not an instruction to display HDR is given in the HDR recommended area according to the information from the user I / F unit 502. Then, when the control unit 5 is instructed to display the HDR in the HDR recommended area, the BL brightness determination unit 6 sets the detection result and the range information of the HDR recommended area as in the first embodiment. It is output to the correction parameter determination unit 9 and the gradation characteristic conversion unit 11. The BL luminance determination unit 6, the correction parameter determination unit 9, and the gradation characteristic conversion unit 11 perform the same processing as in the first embodiment. As a result, when the instruction to display HDR in the recommended HDR area is given, the HDR display is performed in the recommended HDR area, and when the instruction to display HDR in the recommended HDR area is not given, SDR display is performed in the HDR recommended area. SDR display is performed in areas other than the HDR recommended area.

The control unit 5 may generate range information from the luminance features of each divided region. For example, range information may be generated so that the maximum value of the luminance feature amount (maximum gradation value) in the HDR recommended region is set as the maximum value of the gradation value belonging to HDR.

As described above, according to the present embodiment, the HDR recommended area (the area where HDR display should be performed) is automatically detected and notified to the user, and the display in the HDR recommended area is displayed in HDR according to the subsequent instruction from the user. You can switch between display and SDR display. As a result, the effect of the first embodiment can be obtained, and the user can prevent the user from overlooking the image quality confirmation of the HDR display image.

In this embodiment, an example is shown in which the HDR recommended area is notified to the user by displaying a graphic image on the screen of the image display device 300, but the present invention is not limited to this. For example, the HDR recommended area may be notified to the user by displaying a graphic image on the screen of the external device by cooperating with the external device (application of the external device). The external device is, for example, a tablet PC, a works station, or the like.

<Example 5>
Hereinafter, the image display device according to the fifth embodiment of the present invention will be described. In the following, configurations and processes different from those of Examples 1 to 4 will be described in detail, and description of the same configurations and processes as in Examples 1 to 4 will be omitted.

In the fourth embodiment, the user is notified of the automatically detected HDR recommended area. However, in the image display device, when a plurality of HDR recommended areas are detected, the process (ideal process) of "displaying HDR in all HDR recommended areas" may not be executed. For example, when the image display device is driven by a battery, the ideal process may not be executed due to the limitation of the power supply capacity. Therefore, in this embodiment, when the ideal process should not be executed and there are a plurality of synthesis recommended regions (set specific regions) which are regions consisting of one or more HDR recommended regions, a plurality of synthesis recommended regions are present. Give priority (priority) to each of. Then, the user is further notified of the priority of each synthesis recommended area. As a result, the user can grasp that the ideal process cannot be executed (should not be executed), the synthesis recommended area in which the HDR display should be preferentially performed, and the like. As a result, even when the ideal process cannot be executed, the user can prevent oversight of the image quality confirmation of the HDR display image.

FIG. 14 is a block diagram showing an example of the functional configuration of the image display device 400 according to the present embodiment. As shown in FIG. 14, the image display device 400 has a plurality of functional units, a power estimation unit 401, and a priority determination unit 402 included in the image display device 300 of the fourth embodiment.

The power estimation unit 401 estimates the power used in the image display device 400 (BL module unit 3). For example, the power estimation unit 401 estimates the power when HDR display is performed in all HDR recommended areas. Then, the power estimation unit 401 outputs the power estimation result to the priority determination unit 402. The power estimation method is not particularly limited. If the BL control value determined by the BL control value determination unit 7 is used, the power can be estimated with high accuracy. In this embodiment, the power estimation unit 401 roughly estimates the power from the detection result of the HDR recommended region, the range information, and the luminance feature amount of each divided region. Specifically, the target brightness determined by the BL brightness determination unit 6 is estimated, and the power is estimated from the estimated target brightness.

Consider the case where the target luminance in each light emitting region is the value shown in FIG. 15 (A). Here, it is assumed that the maximum value of the target luminance when the HDR display is not performed, that is, the target luminance when the local demming process is not performed is 10. The total sum of the target luminances shown in FIG. 15 (A) is 1493. On the other hand, the total target brightness when the local demming process is not performed is 10 × 60 (the number of light emitting regions) = 600. Therefore, in FIG. 15A, the BL module unit 3 is lit with a brightness of 1493/600 ≈ 2.48 times the brightness when the local deming process is not performed. Then, assuming that the power of the BL module unit 3 when the local deming process is not performed is A, it can be estimated that the power in the case of FIG. 15 (A) is 2.48 × A.

The priority determination unit 402 determines the synthesis recommended region from the detection result of the HDR recommended region. Then, when a plurality of synthesis recommended regions exist, the priority determination unit 402 displays "HDR display in all HDR recommended regions (all synthesis recommended regions)" based on the power estimated by the power estimation unit 401. Judge whether or not the ideal process of "perform" may be performed. Whether or not the ideal processing may be performed depends on the power supply specifications of the image display device 400. Therefore, in the present embodiment, the priority determination unit 402 determines that the ideal process may be performed when the power estimated by the power estimation unit 401 is equal to or greater than the threshold value. The threshold value to be compared with the electric power may be a fixed value predetermined by the manufacturer, or may be a value changed according to the state of the image display device 400, an instruction from the user, or the like. ..

Then, when it is determined that the ideal processing should not be performed, the priority determination unit 402 determines the priority of each synthesis recommended area and outputs the priority of each synthesis recommended area to the control unit 5. In this embodiment, the priority is determined based on the size of each recommended synthesis region. The smaller the size of the recommended synthesis area, the higher the possibility that HDR display can be performed in all the recommended HDR areas included in the recommended synthesis area. Therefore, the priority determination unit 402 determines the higher priority as the size of the recommended synthesis region is smaller. When the target luminance of each light emitting region (each divided region) is the value shown in FIG. 15 (A), two composite recommended regions 450 and 451 are determined as shown in FIG. 15 (B). The synthetic recommended region 450 includes nine divided regions, and the synthetic recommended region 451 includes four divided regions. Therefore, as the priority of the synthesis recommended region 451, a priority higher than the priority of the synthesis recommended region 450 is determined.

The control unit 5 of this embodiment performs the same control as the control described in Examples 1 to 4. However, when the priority of each synthesis recommended area is output from the priority determination unit 402, the control unit 5 of this embodiment sends the synthesis unit 10 in order to notify the user of the priority in addition to the HDR recommended area. On the other hand, the detection result of the HDR recommended area and the priority of each synthetic recommended area are notified. The compositing unit 10 synthesizes graphic image data representing the graphic image so that the detection result of the HDR recommended region and the priority of each compositing recommended region are displayed in the graphic image. For example, the graphic image data is combined with the target image data before correction. As a result, composite image data is generated by synthesizing graphic image data with the target image data before correction. Then, the synthesis unit 10 outputs the composite image data to the gradation characteristic conversion unit 11.

The image data to which the graphic image data is combined is not particularly limited. Graphic image data may be combined with the target image data after being corrected so that the SDR display is performed on the entire screen.

The graphic image is, for example, an image including an image (rectangular frame image) such as a broken line in FIG. 16 and a number. Numbers 1 and 2 shown in FIG. 16 are priorities corresponding to priorities. The dashed line corresponding to priority 1 indicates the synthetic recommended region 450 in FIG. 15 (B), and the dashed line corresponding to priority 2 indicates the synthetic recommended region 451. By displaying the graphic image, the user is notified of the HDR recommended area (composite recommended area). In other words, the user can grasp the HDR recommended area, the presence or absence of the HDR recommended area, and the like by checking the displayed graphic image. In addition, by displaying the graphic image, the user is notified of the priority of each recommended composition area. In other words, the user can grasp the priority of each composite recommended area by checking the displayed graphic image. In addition, since the priority is notified when it is determined that the ideal process should not be executed, the user can grasp that the ideal process should not be executed by checking the displayed graphic image. it can.

The processing after the graphic image showing the detection result of the HDR recommended region and the priority of each composite recommended region is displayed is not particularly limited. For example, the ideal process may be performed according to the instruction to display the HDR in the HDR recommended area, or the process to display the HDR may be performed only in the composite recommended area having the highest priority. A number of recommended synthesis areas capable of displaying HDR may be selected in order from the highest priority, and a process of displaying HDR may be performed only in the selected recommended synthesis area. The user I / F unit 302 may receive an instruction from the user regarding the synthesis recommended area for displaying HDR and the synthesis recommended area for not displaying HDR, and perform processing according to the instruction. Specifically, the process of performing HDR display may be performed only in the synthesis recommended area designated by the user as the synthesis recommended area for displaying HDR.

As described above, according to the present embodiment, when there are a plurality of recommended synthesis regions and the ideal process should not be executed, not only the detection result of the HDR recommended region but also the priority of each recommended synthesis region is given. The degree is notified to the user. As a result, the convenience of checking the image quality of the displayed image can be further improved. Specifically, the user can grasp that the ideal process cannot be executed (should not be executed), the synthesis recommended area in which the HDR display should be preferentially performed, and the like. As a result, even when the ideal process cannot be executed, the user can prevent oversight of the image quality confirmation of the HDR display image.

In this embodiment, the smaller the size of the recommended synthesis region, the higher the priority is determined, but the present invention is not limited to this. For example, the larger the size of the recommended synthesis region, the higher the priority may be determined, or the closer the size of the recommended synthesis region is to the predetermined size, the higher the priority may be determined. The priority may be determined based on information different from the size of the recommended synthesis area. For example, the priority may be determined based on the degree of concentration of frequencies in the histogram of gradation values. Specifically, the higher the concentration of frequencies, the higher the priority, the lower the concentration of frequencies, the higher the priority, the closer the gradation value in which the frequencies are concentrated to the predetermined gradation value, the higher the priority, etc. May be determined. The predetermined gradation value is, for example, a gradation value that does not belong to SDR and belongs to HDR. Further, when the number of recommended synthesis regions is one and the ideal processing should not be executed, a graphic image may be notified that the ideal processing should not be executed.

<Other Examples>
The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

1,100,200,300,400,101-1003: Image display device 2: Liquid crystal panel unit 3: BL module unit 4: Feature amount acquisition unit 5: Control unit 6: BL brightness determination unit 7: BL control value determination unit 8: Luminance estimation unit 9: Correction parameter determination unit 11: Gradation characteristic conversion unit 12: Luminance correction unit 13: Information processing device 14: Network I / F unit 18: Image acquisition unit 301: HDR recommended area detection unit 302: User I / F section 401: Power estimation section 402: HDR priority region determination section

Claims (7)

A light emitting means having a plurality of light emitting regions corresponding to a plurality of divided regions constituting the screen,
A display means for displaying a display image based on an input image on the screen by modulating the light from the light emitting means.
A feature amount acquisition means for acquiring a plurality of luminance features corresponding to each of the plurality of divided regions from the input image, and
A first information acquisition means for acquiring range information indicating a second dynamic range wider than the first dynamic range, and
A second information acquisition means for acquiring area information indicating an HDR image area, which is a part of the display image displayed on the screen, and
Detection to detect an HDR divided region, which is a divided region corresponding to the HDR image region, and a non-HDR divided region, which is a divided region not corresponding to the HDR image region, from the plurality of divided regions based on the region information. Means and
Display in the first dynamic range in the non-HDR division region based on the respective luminance features of the plurality of division regions, the range information, and the detection results of the HDR division region and the non-HDR division region. The individual control of the emission luminance of each of the plurality of emission regions and the gradation conversion of the input image are performed so that the display is performed in the second dynamic range in the HDR division region. Control measures to be performed and
Have,
The control means, together with the display image, has a threshold value of the brightness of the first graphic image showing the HDR image region, or the light emitted from the light emitting means and not the HDR division region and applied to the display means. An image display device comprising a compositing means for synthesizing the input image and the first or second graphic image so that the second graphic image indicating the area of the screen as described above is displayed. .. A light emitting means having a plurality of light emitting regions corresponding to a plurality of divided regions constituting the screen,
By modulating the light from the light emitting means, a display image based on the input image is displayed on the screen.
Display means to display and
A feature amount acquisition means for acquiring a plurality of luminance features corresponding to each of the plurality of divided regions from the input image, and
A first information acquisition means for acquiring range information indicating a second dynamic range wider than the first dynamic range, and
A second information acquisition means for acquiring area information indicating an HDR image area, which is a part of the display image displayed on the screen, and
Detection to detect an HDR divided region, which is a divided region corresponding to the HDR image region, and a non-HDR divided region, which is a divided region not corresponding to the HDR image region, from the plurality of divided regions based on the region information. Means and
Display in the first dynamic range in the non-HDR division region based on the respective luminance features of the plurality of division regions, the range information, and the detection results of the HDR division region and the non-HDR division region. The individual control of the emission luminance of each of the plurality of emission regions and the gradation conversion of the input image are performed so that the display is performed in the second dynamic range in the HDR division region. Control measures to be performed and
Have,
The control means
A determination means for determining the emission brightness of each of the plurality of light emitting regions based on the respective luminance features of the plurality of divided regions, the range information, and the detection results of the HDR divided region and the non-HDR divided region. When,
A gradation conversion means that performs gradation conversion of the input image based on the range information, the detection results of the HDR divided region and the non-HDR divided region, and the emission brightness of each of the plurality of light emitting regions.
Have,
The determining means determines the emission brightness of the light emitting region corresponding to the non-HDR divided region among the plurality of light emitting regions by using the first luminance range set corresponding to the first dynamic range. Then, among the plurality of light emitting regions, the light emitting brightness of the light emitting region corresponding to the HDR divided region is determined using the second luminance range set corresponding to the second dynamic range.
Wherein the ratio of the first luminance range and the second luminance range, the first dynamic range and the ratio between images display you characterized in that matching of the second dynamic range. The minimum luminance in the first luminance range coincides with the minimum luminance in the second luminance range.
The image display device according to claim 2 , wherein the luminance feature amount of each of the plurality of divided regions is the maximum gradation value of the display image displayed in each of the plurality of divided regions. The gradation conversion estimates the irradiance brightness, which is the brightness of the light emitted from the light emitting means and irradiates the display means, based on the irradiance brightness of each of the plurality of light emitting regions, and the range information, the said. The second or third claim, wherein the process includes a process of correcting the gradation value of the input image based on the detection result of the HDR divided region and the non-HDR divided region and the estimation result of the irradiance. Image display device. A light emitting means having a plurality of light emitting regions corresponding to a plurality of divided regions constituting the screen,
A display means for displaying a display image based on an input image on the screen by modulating the light from the light emitting means.
It is a control method of an image display device having
A feature amount acquisition step of acquiring a plurality of luminance features corresponding to each of the plurality of divided regions from the input image, and
The first information acquisition step of acquiring range information indicating a second dynamic range wider than the first dynamic range, and
A second information acquisition step of acquiring area information indicating an HDR image area, which is a part of the display image displayed on the screen, and
Detection to detect an HDR divided region, which is a divided region corresponding to the HDR image region, and a non-HDR divided region, which is a divided region not corresponding to the HDR image region, from the plurality of divided regions based on the region information. Steps and
Display in the first dynamic range in the non-HDR division region based on the respective luminance features of the plurality of division regions, the range information, and the detection results of the HDR division region and the non-HDR division region. The individual control of the emission luminance of each of the plurality of emission regions and the gradation conversion of the input image are performed so that the display is performed in the second dynamic range in the HDR division region. Control steps to perform and
Have,
In the control step, the brightness of the first graphic image showing the HDR image region or the light emitted from the light emitting means and not the HDR divided region and radiated to the display means is a threshold value together with the display image. An image display device comprising a compositing step of synthesizing the input image and the first or second graphic image so that the second graphic image indicating the area of the screen as described above is displayed. Control method. A light emitting means having a plurality of light emitting regions corresponding to a plurality of divided regions constituting the screen,
A display means for displaying a display image based on an input image on the screen by modulating the light from the light emitting means.
It is a control method of an image display device having
A feature amount acquisition step of acquiring a plurality of luminance features corresponding to each of the plurality of divided regions from the input image, and
The first information acquisition step of acquiring range information indicating a second dynamic range wider than the first dynamic range, and
A second information acquisition step of acquiring area information indicating an HDR image area, which is a part of the display image displayed on the screen, and
Detection to detect an HDR divided region, which is a divided region corresponding to the HDR image region, and a non-HDR divided region, which is a divided region not corresponding to the HDR image region, from the plurality of divided regions based on the region information. Steps and
Display in the first dynamic range in the non-HDR division region based on the respective luminance features of the plurality of division regions, the range information, and the detection results of the HDR division region and the non-HDR division region. The individual control of the emission luminance of each of the plurality of emission regions and the gradation conversion of the input image are performed so that the display is performed in the second dynamic range in the HDR division region. Control steps to perform and
Have,
The control step
A determination step of determining the emission brightness of each of the plurality of light emitting regions based on the respective luminance features of the plurality of divided regions, the range information, and the detection results of the HDR divided region and the non-HDR divided region. When,
A gradation conversion step for performing gradation conversion of the input image based on the range information, the detection results of the HDR divided region and the non-HDR divided region, and the emission brightness of each of the plurality of light emitting regions.
Including
In the determination step, the emission brightness of the emission region corresponding to the non-HDR division region among the plurality of emission regions is determined using the first luminance range set corresponding to the first dynamic range. Then, among the plurality of light emitting regions, the light emitting brightness of the light emitting region corresponding to the HDR divided region is determined using the second luminance range set corresponding to the second dynamic range .
A control method for an image display device , wherein the ratio of the first luminance range to the second luminance range matches the ratio of the first dynamic range to the second dynamic range . A program for causing a computer to execute each step of the control method of the image display device according to claim 5 or 6 .

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