JP2022007871A - Image generation apparatus, display apparatus, control method, system, program, and storage medium - Google Patents

Abstract

To provide a system for enabling a display apparatus to perform HDR display without performing multi-bit processing required by HDR.SOLUTION: In a display system, a display apparatus, in which image data generated in an image generation apparatus is output through an external data transmission line, includes a display unit that is capable of displaying a High Dynamic Range (HDR) image or a Standard Dynamic Range (SDR) image. The image generation apparatus has a light emission characteristic inverse conversion unit configured to perform inverse conversion of a light emission characteristic of the display unit with respect to the image data. The light emission characteristic of the display unit approximates an Electro-Optical Transfer Function (EOTF) of the HDR. When a bit precision of the image data output from the image generation apparatus is greater than or equal to a bit precision of the external data transmission line and the display unit displays the HDR image, the image data generated by the light emission characteristic inverse conversion unit is output to the display unit through the external data transmission line.SELECTED DRAWING: Figure 2

Description

The present invention relates to a system capable of displaying HDR (High Dynamic Range) images.

Display devices that can display a wider dynamic range than the conventional dynamic range have appeared. The dynamic range that can be expressed by a conventional display device is called SDR (Standard Dynamic Range), and the dynamic range that can be expressed by a conventional display device is called HDR (High Dynamic Range). SDR is RECOMMENDATION ITU-R BT. The standard 709 (hereinafter, ITU BT.709) is premised on processing with a quantization level of 8 bits or more. HDR is a standard called SMPTE STANDARD 2084 (hereinafter referred to as SMPTE ST 2084) and is premised on multi-bit processing of at least 10 bits or more. HDR is more multi-bit processing than SDR because the gradation range assigned to one bit is widened at the quantization level of the same number of bits as SDR, and gradation failure such as pseudo contour is likely to occur.

Patent Document 1 describes a technique for displaying an image close to reality in HDR using multi-bit, high-precision data.

Japanese Patent No. 4941285

By the way, in mirrorless cameras and the like, there is a shift from an optical viewfinder (OVF) to an electronic viewfinder (EVF). Although the OVF has an HDR display close to human visual characteristics, the current EVF cannot display an HDR. This is because the multi-bit processing associated with HDR causes an increase in power consumption, heat generation, cost increase, etc. due to an increase in circuit scale, and is therefore difficult to introduce into a small device such as an EVF. ..

In addition, the current EVF does not have sufficient resolution and frame rate, and the bandwidth allocation of the external data transmission line connecting the image processing engine and the EVF is higher than the gradation improvement by HDR accompanied by the increase in bits. And frame rate are prioritized. Therefore, at present, the 8-bit SDR image generated by the image processing engine is output to the EVF through the external data transmission path, and it is difficult to display HDR without gradation failure.

The present invention has been made in view of the above problems, and an object of the present invention is to realize a technique for enabling HDR display without performing multi-bit processing associated with HDR in a display device.

In order to solve the above problems and achieve the object, the present invention is a system in which image data generated by an image generator is output to a display device through an external data transmission path, and the display device is an HDR ( It has a display unit capable of displaying an image of High Dynamic Range) or an image of SDR (Standard Dynamic Range), and the image generator performs inverse conversion of the light emission characteristics of the display unit with respect to image data. It has a light emission characteristic inverse conversion means, the light emission characteristic of the display unit is close to the EOTF (Electro-Optical Transfer Foundation) of the HDR, and the bit accuracy of the image data output from the image generator is the external. When the HDR image is displayed on the display unit with a bit accuracy of the data transmission path or higher, the image data generated by the emission characteristic inverse conversion means is output to the display device through the external data transmission path. do.

Further, the present invention is a system in which image data generated by an image generation device is output to a display device through an external data transmission path, and the display device is an HDR (High Dynamic Range) image or an SDR (Standard Dynamic). The image generator has an HDR OETF (Optical-Electro Transfer Function) conversion means for converting image data based on HDR OETF, and has a display unit capable of displaying a Range) image. The light emission characteristics of the display unit are close to the EOTF (Electro-Optical Transfer Function) of the HDR, and the bit accuracy of the image data output from the image generator is equal to or higher than the bit accuracy of the external data transmission path. When displaying the HDR image on the display unit, the image data generated by the HDR OETF conversion means is output to the display device through the external data transmission path.

According to the present invention, HDR display becomes possible without performing multi-bit processing associated with HDR in the display device.

The block diagram which illustrates the structure of the display system of the comparative example of this embodiment. (A) is a block diagram illustrating the configuration of the display system of the first embodiment, (b) is a block diagram showing the configuration of the emission characteristic inverse conversion unit at the time of RGB input, and (c) is the emission characteristic inverse conversion at the time of YCC input. The block diagram which shows the structure of a part. The flowchart which shows the processing of the image selection part of Embodiment 1. The block diagram which illustrates the structure of the display system of Embodiment 2. The flowchart which shows the processing of the image selection part of Embodiment 2. The block diagram which illustrates the structure of the display system of Embodiment 3. The block diagram which illustrates the structure of the display system of Embodiment 4. The figure which illustrates EOTF. The figure which illustrates OETF. The figure which illustrates OETF conversion and gradation assignment with respect to the luminance level of an input image. The block diagram which illustrates the structure of the display system of Embodiment 5. The block diagram which illustrates the HDR OETF conversion part. The figure which illustrates SMPTE ST 2084 and linear OETF. The figure which illustrates the color gamut characteristic. The block diagram which illustrates the structure of the display system of Embodiment 6. The block diagram which illustrates the gain addition part. The block diagram which illustrates the structure of the display system of Embodiment 7.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the invention according to the claims. Although a plurality of features are described in the embodiment, not all of the plurality of features are essential for the invention, and the plurality of features may be arbitrarily combined. Further, in the attached drawings, the same or similar configurations are given the same reference numbers, and duplicate explanations are omitted.
[Comparative Example] First, a display system of a comparative example of the present embodiment will be described.

FIG. 1 shows a configuration of a display system of a comparative example of the present embodiment and a flow of processing from image input to display.

The analog image data input from the image input unit 101 is converted into digital data by the AD (Analog Digital) conversion unit 102. The image data converted into digital data is OETF-converted by the OETF (Optical-Electro Transfer Function) conversion unit 103. The OETF-converted image data is converted into analog data by the DA (Digital Analog) conversion unit 104, and EOTF-converted by the EOTF (Electro-Optical Transfer Function) conversion unit 105. The OETF conversion and the EOTF conversion have an inverse conversion relationship. The EOTF-converted image data is displayed on the display unit 106. Due to such a configuration and a flow of processing, the same image data as the image data input from the image input unit 101 is displayed on the display unit 106.

The display unit 106 is configured by using a display material such as a cathode ray tube, an LCD (Liquid Crystal Display), and an organic EL (Electroluminescence). The display unit 106 has unique light emission characteristics depending on the material and composition. The cathode ray tube material is ITU BT. It has emission characteristics close to EOTF defined in 709. On the other hand, in the display unit 106, the EOTF based on human perception is defined by SMPTE ST 2084. The EOTF conversion unit 105 converts the input image data by EOTF according to the light emission characteristics of the display unit 106. When displaying an image on the display unit 106, EOTF conversion is performed on the image data according to the light emission characteristics of the display unit 106. Therefore, the OETF conversion unit 103 performs OETF conversion, which is the inverse conversion of EOTF, in advance for the input image. Will be executed.

FIG. 8 shows SMPTE ST 2084, ITU BT. 709, is a figure illustrating each EOTF of the light emission characteristic of an organic EL material. In FIG. 8, the vertical axis shows the emission luminance which is the output of EOTF, and the horizontal axis shows the code value of the electrical input data which is the input of EOTF. The emission characteristics of the organic EL material draw a curve very similar to SMPTE ST 2084. The emission characteristics of the organic EL material largely depend on the switching characteristics of the transistor that allows current to flow through the display material, and have the characteristic that the emission brightness increases sharply from a certain threshold value.

FIG. 9 shows SMPTE ST 2084, ITU BT. 709 is a diagram illustrating each OETF of the light emission characteristics of the organic EL material. The OETF shown in FIG. 9 is an inverse function of the EOTF shown in FIG. In FIG. 9, the vertical axis shows the code value which is the output of OETF, and the horizontal axis shows the image data output from the AD conversion unit 102 as a percentage conversion value. The output value of the AD conversion unit 102 has a linear relationship with the luminance level of the object.

FIG. 10 illustrates the assignment of gradations when the output of the OETF conversion unit 103 is set to 8 bits and 256 gradations with respect to the value obtained by converting the luminance level of the input image data into a percentage. In human perception (visual sense), the gradation discrimination ability is higher in the dark part than in the bright part. Therefore, in SMPTE ST 2084, gradation data from 0 to 130 is assigned to an input luminance level of 1% or less. In the OETF conversion of SMPTE ST 2084, the code values considering human perception are evenly distributed from the dark part to the bright part, so that gradation failure is less likely to occur even if the input range is increased. .. As a result, SMPTE ST 2084 is used as an OETF for HDR (High Dynamic Range).

On the other hand, ITU BT. Since only the gradation data from 0 to 11 is assigned to the input luminance level of 1% or less in the 709, when the input range is increased, the gradation failure in the dark part becomes easy to be seen. ITU BT. 709 is used as an OETF of SDR (Standard Dynamic Range) having a narrower input range than HDR. The emission characteristics of the organic EL material have characteristics similar to those of SMPTE ST 2084. This means that human perception and the emission characteristics of the organic EL material are close to each other.

Hereinafter, an example of a system applied to an image pickup device such as a camera as an image generation device and an EVF of a camera as a display device will be described, but the present invention is not limited thereto.

[Embodiment 1] Next, the first embodiment will be described.

FIG. 2A is a block diagram illustrating the configuration of the display system of the first embodiment.

The system of the first embodiment includes an image generation device 200, an external data transmission line 220 having a precision of 10 bits or less, and a display device 240. In the image generation device 200, the imaging unit 201 acquires imaging data. The imaging data acquired by the imaging unit 201 is converted from analog data to digital data by the AD conversion unit 202, and the digital imaging data is corrected by the data correction unit 203 for defects caused by the image sensor such as scratches and unevenness. Will be. The imaging data corrected by the data correction unit 203 is converted into image data by the development unit 204, and the ITU BT. It is converted to OETF conforming to standards such as 709 and SMPTE ST 2084. The OETF-converted image data is stored in the recording medium 207 by the recording / reproducing unit 206.

The light emission characteristic inverse conversion unit 208 performs the reverse conversion of the light emission characteristic conversion unit 245 according to the display unit 246. The light emission characteristic reverse conversion unit 208 performs light emission characteristic reverse conversion on the image data OETF-converted by the OETF conversion unit 205. When the image data output from the OETF conversion unit 205 is the image data to which the HDR OETF conversion has been performed, the SDR OETF conversion unit 209 performs the SDR OETF conversion. On the other hand, the data read from the recording medium 207 is reproduced as image data by the recording / reproducing unit 206. The light emission characteristic inverse conversion unit 208 performs light emission characteristic reverse conversion on the image data reproduced by the recording / reproduction unit 206. Further, the SDR OETF conversion unit 209 performs SDR OETF conversion when the reproduced image data is HDR OETF-converted image data.

The image selection unit 210 selects either the image data generated by the light emission characteristic inverse conversion unit 208 or the image data generated by the SDR OETF conversion unit 209. The image data selected by the image selection unit 210 is output from the image generation device 200 to an external device by the transmission unit 211. The image data output from the image generation device 200 is input to the display device 240 through the external data transmission path 220. The external data transmission line 220 is a data transmission line dedicated to image data, and is a MIPI (Mobile Industry Processor Interface) (registered trademark), LVDS (Low Voltage Differential Signaling), subLVDS, HDMI (High-Definition Multimedia Interface) (registered trademark). ), DisplayPort (registered trademark), SDI (Serial Digital Interface), etc. are assumed.

The display device 240 receives the image data output from the image generation device 200 through the external data transmission line 220 by the receiving unit 241. The light emission characteristic inverse conversion unit 242 reversely converts the light emission characteristics of the display unit 246 into the image data received by the reception unit 241. When the image selection unit 210 of the image generation device 200 selects the image data generated by the SDR OETF conversion unit 209, the image selection unit 243 selects the image data generated by the emission characteristic inverse conversion unit 242. .. When the image selection unit 210 of the image generation device 200 selects the image data generated by the light emission characteristic inverse conversion unit 208, the image data received by the reception unit 241 is selected. The image data output from the image selection unit 243 is converted from digital data to analog data by the DA conversion unit 244. The analog data converted by the DA conversion unit 244 is converted into light emission characteristics according to the display unit 246 by the light emission characteristic conversion unit 245 and displayed on the display unit 246.

Next, the processing of the light emission characteristic inverse conversion unit 208 and the light emission characteristic inverse conversion unit 242 will be described with reference to FIG. 2 (b). FIG. 2B shows an example in which the pixels of the display unit 246 are composed of RGB, but the same applies to the case where the pixels of the display unit 246 are composed of other pixels such as CMY. Since each of the RGB pixels has an individual emission characteristic, the emission characteristic inverse conversion units 208a, 208b, and 208c perform the emission characteristic inverse conversion of each of RGB. The RGB data whose emission characteristics are inversely converted is output after the white balance is adjusted by the WB (White Balance) unit 208d. The reverse conversion of light emission characteristics and the processing order of white balance may be reversed or may be performed at the same time.

Next, using FIG. 2C, processing of the light emission characteristic inverse conversion unit 208 when the input image data of the light emission characteristic inverse conversion unit 208 is YCC (luminance, color difference) data will be described. The YCC RGB conversion unit 208e converts the input YCC data into RGB data. The processing after RGB conversion is the same as in FIG. 2 (b). The RGB data whose white balance has been adjusted by the WB unit 208 is converted into YCC data by the RGB YCC conversion unit 208f and output.

Since the light emission characteristic inverse conversion unit 242 of the display device 240 outputs RGB data corresponding to the pixels of the display unit 246, the RGB YCC conversion unit 208f is not provided.

Next, using FIG. 3, the image selection unit 210 of the image generation device 200 selects the image data generated by the emission characteristic inverse conversion unit 208 or the image data generated by the SDR OETF conversion unit 209. Will be explained.

FIG. 3 is a flowchart showing a process in which the image selection unit 210 of the image generation device 200 selects the image data generated by the light emission characteristic inverse conversion unit 208 or the image data generated by the SDR OETF conversion unit 209.

After starting the process in S301, in S302, the image selection unit 210 makes a determination based on the light emission characteristics of the display unit 246. In the explanation so far, the EOTF of HDR is SMPTE ST 2084, and the EOTF of SDR is ITU BT. Although it has been set to 709, the EOTF of HDR is not limited to SMPTE ST 2084. When OETF, which is an inverse function of EOTF, has more dark gradation allocation than SDR, the EOTF can be HDR EOTF. The emission characteristic is close to HDR EOTF that the sum of squares of the difference between the emission characteristic of the display unit 246 and the HDR EOTF is smaller than the square sum of the difference between the emission characteristic of the display unit 246 and the SDR EOTF. Is defined as.

As described with reference to FIG. 8, the emission characteristics of the organic EL material are similar to HDR EOTF. On the other hand, the emission characteristics of the cathode ray tube and the like are close to the EOTF of SDR and not to the EOTF of HDR. Therefore, in S302, when the image selection unit 210 determines that the light emission characteristics of the display unit 246 are not close to the EOTF of HDR, the image selection unit 210 selects the image data generated by the SDR OETF conversion unit 209 in S305. Further, in S302, when the image selection unit 210 determines that the light emission characteristics of the display unit 246 are close to the EOTF of HDR, the bit accuracy and the external of the image data generated by the OETF conversion unit 205 in S303. The bit accuracy of the data transmission line 220 is compared. Bit precision does not mean the physical bit width, but the actual bit width. For example, when 8-bit data is packed in a 10-bit width and the remaining 2 bits are filled with 0, the accuracy is 8 bits. In S303, when the image selection unit 210 determines that the bit accuracy of the image data generated by the OETF conversion unit 205 is smaller than the bit accuracy of the external data transmission path 220, the image selection unit 210 is generated by the SDR OETF conversion unit 209 in S305. Select the image data. Further, in S303, when the image selection unit 210 determines that the bit accuracy of the image data generated by the OETF conversion unit 205 is equal to or higher than the bit accuracy of the external data transmission line 220, the image to be displayed in S304 is HDR. Judge whether or not. In S304, when the image selection unit 210 determines that the image to be displayed is not HDR, the image selection unit 210 selects the image data generated by the SDR OETF conversion unit 209 in S305. Further, in S304, when the image selection unit 210 determines that the image to be displayed is HDR, the image selection unit 210 selects the image data generated by the light emission characteristic inverse conversion unit 208 in S306. After that, the process ends in S307.

In FIG. 3, the process of selecting the image data generated by the light emission characteristic inverse conversion unit 208 or the image data generated by the SDR OETF conversion unit 209 by the image selection unit 210 has been described. In order to unify the types of OETF of the image data of the external data transmission line 220, or from the viewpoint of the processing cost of the inverse conversion of the light emission characteristics, it is better to process the image in the image generation device 200 than in the display device 240. The image selection unit 210 may always select the image data generated by the light emission characteristic inverse conversion unit 208.

The determination conditions of S302 and S303 in FIG. 3 are determined at the stage of selecting the image generation device 200, the external data transmission line 220, and the display device 240, which are the components of the display system, and are dynamically selected during the operation of the display system. It is not something that will be done.

Further, the image data displayed on the display unit 246 needs to be inversely converted into light emission characteristics before the DA conversion by the DA conversion unit 443. In the present embodiment, in the case of HDR display in which gradation failure is likely to occur, light emission similar to HDR OETF with respect to image data generated by the OETF conversion unit 205 having a bit accuracy or higher of the external data transmission line 220 or higher. Performs the inverse conversion of the characteristics. This makes it possible to reduce the quantization error and the calculation error and minimize the gradation failure of the displayed image.

[Embodiment 2] Next, the second embodiment will be described.

FIG. 4 is a block diagram illustrating the configuration of the display system of the second embodiment.

The system of the second embodiment includes an image generation device 400, an external data transmission line 420 having a precision of 10 bits or less, and a display device 440. In the image generation device 400, the imaging unit 401 acquires the imaging data. The imaging data acquired by the imaging unit 401 is converted from analog data to digital data by the AD conversion unit 402. In the digital imaging data, the data correction unit 403 corrects defects caused by the sensor such as scratches and unevenness. The imaging data corrected by the data correction unit 403 is converted into image data by the development unit 404, and the ITU BT. It is converted to OETF conforming to standards such as 709 and SMPTE ST 2084. The OETF-converted image data is stored in the recording medium 407 by the recording / reproducing unit 406.

When the image data output from the OETF conversion unit 405 is the image data to which the SDR OETF conversion has been performed, the HDR OETF conversion unit 408 performs the HDR OETF conversion. When the image data generated by the OETF conversion unit 405 is the image data obtained by performing the HDR OETF conversion, the SDR OETF conversion unit 409 performs the SDR OETF conversion. Further, the image data read from the recording medium 407 is reproduced as image data by the recording / reproducing unit 406. The HDR OETF conversion unit 408 performs HDR OETF conversion when the image data reproduced by the recording / reproduction unit 406 is image data obtained by performing SDR OETF conversion. When the image data reproduced by the recording / reproducing unit 406 is the image data obtained by performing the HDR OETF conversion, the SDR OETF conversion unit 409 performs the SDR OETF conversion.

The image selection unit 410 selects either the image data generated by the HDR OETF conversion unit 408 or the image data generated by the SDR OETF conversion unit 409. The image data selected by the image selection unit 410 is output from the image generation device 400 to the external device by the transmission unit 411. The image data output from the image generation device 400 is input to the display device 440 through the external data transmission line 420. The external data transmission line 420 is a data transmission line dedicated to image data, and MIPI (registered trademark), LVDS, subLVDS, HDMI (registered trademark), DisplayPort (registered trademark), SDI, and the like are assumed.

The display device 440 receives the image data by the receiving unit 441. The image data received by the receiving unit 441 is subjected to the inverse conversion of the light emitting characteristics by the light emitting characteristic inverse conversion unit 442. The image data obtained by reverse conversion of the light emission characteristics is converted from digital data to analog data by the DA conversion unit 443. The analog data DA-converted by the DA conversion unit 443 is converted into light emission characteristics according to the display unit 445 by the light emission characteristic conversion unit 444 and displayed on the display unit 445. The light emission characteristic reverse conversion unit 442 performs the same as the processing of the light emission characteristic reverse conversion unit 242 shown in FIGS. 2 (b) and 2 (c), such as reverse light emission characteristic conversion and white balance adjustment of each RGB, and from YCC to RGB. Is converted.

Next, with reference to FIG. 5, the procedure of the process in which the image selection unit 410 of the image generation device 400 selects the image data generated by the HDR OETF conversion unit 408 or the image data generated by the SDR OETF conversion unit 409. explain.

FIG. 5 is a flowchart showing a process in which the image selection unit 410 of the image generation device 400 selects the image data generated by the HDR OETF conversion unit 408 or the image data generated by the SDR OETF conversion unit 409.

After starting the process in S501, in S502, the image selection unit 410 makes a determination based on the light emission characteristics of the display unit 445. When the image selection unit 410 determines that the light emission characteristics of the display unit 445 are not close to the HDR EOTF, the image selection unit 410 selects the image data generated by the SDR OETF conversion unit 409 in S505. Further, when the image selection unit 410 determines that the light emission characteristics of the display unit 445 are close to the EOTF of HDR, the bit accuracy of the image data generated by the OETF conversion unit 405 and the external data transmission path in S503. Compare the bit accuracy of 420. When the image selection unit 410 determines that the bit accuracy of the output of the OETF conversion unit 405 is smaller than the bit accuracy of the external data transmission line 420, the image selection unit 410 selects the image data generated by the SDR OETF conversion unit 409 in S505. When the image selection unit 410 determines that the bit accuracy of the image data generated by the OETF conversion unit 405 is equal to or higher than the bit accuracy of the external data transmission line 420, the image selection unit 410 determines in S504 whether or not the image to be displayed is HDR. do. When the image selection unit 410 determines that the image to be displayed is not HDR, the image selection unit 410 selects the image data generated by the SDR OETF conversion unit 409 in S505. Further, when the image selection unit 410 determines that the image to be displayed is HDR, the image selection unit 410 selects the image data generated by the HDR OETF conversion unit 408 in S506. After that, the process ends in S507.

In FIG. 5, the process of selecting the image data generated by the HDR OETF conversion unit 408 or the image data generated by the SDR OETF conversion unit 409 by the image selection unit 410 of the image generation device 400 has been described. The image selection unit 410 may always select the image data generated by the HDR OETF conversion unit 408 for reasons such as unifying the types of OETF of the image data of the external data transmission line 420.

The determination conditions of S502 and S503 in FIG. 5 are determined at the stage of selecting the image generation device 400, the external data transmission line 420, and the display device 440, which are the components of the display system, and are dynamically selected during the operation of the display system. It is not something that will be done.

Compared with the first embodiment, in the second embodiment, the light emission characteristic inverse conversion unit 208 is replaced with the HDR OETF conversion unit 408. Assuming the light emission characteristics of a cathode ray tube or the like, ITU BT. While EOTFs such as 709 are standardized, EOTFs assuming light emission characteristics of organic EL and the like are not standardized. Since the light emission characteristics of the display material change due to environmental differences such as the temperature of the display unit 445 and the applied voltage and individual differences for each display unit, it is necessary to correct these differences. The image generation device 400 is connected to the display device 440 through an external data transmission line 420, and the image generation device 400 and the display device 440 are independent of each other, and a plurality of image generation devices and a plurality of display devices are selected and combined. Expected to be used. Considering such a combination, it may be easier to control the correction of the light emission characteristics depending on the display material of the display unit 445 by using the display device. That is, it is assumed that the display device 440 performs the inverse conversion of the display unit 445 to the light emission characteristics, and the image data of the external data transmission line 420 is desired to be data conforming to the existing standard. In such a case, by selecting HDR OETF that is close to the emission characteristics of organic EL or the like, the quantization error and calculation error of the inverse conversion of emission characteristics in the display device 440 can be reduced, and the gradation of the displayed image can be reduced. It is possible to minimize the failure.

[Embodiment 3] Next, the third embodiment will be described.

FIG. 6 is a block diagram illustrating the configuration of the display system of the third embodiment.

The system of the third embodiment includes an image generation device 600, an external data transmission line 620 having a precision of 10 bits or less, and a display device 640. The image generation device 600 receives the image data input from the external device by the receiving unit 601. The image processing unit 602 performs image processing on the image data received by the receiving unit 601. For example, when the display system of the present embodiment shows a display image through a lens at the rear stage of the display unit 644, such as VR (Virtual Reality) glasses and electronic binoculars, distortion of the lens may be corrected. Such lens distortion correction is performed by the image processing unit 602. The image-processed data is subjected to reverse conversion of the light emission characteristic conversion unit 643 based on the display unit 644 of the display device 640 by the light emission characteristic reverse conversion unit 603. The image data obtained by reverse conversion of the light emission characteristics is output from the image generation device 600 to an external device by the transmission unit 604. The image data output by the transmission unit 604 is input to the display device 640 through the external data transmission line 620. The external data transmission line 620 is a data transmission line dedicated to image data, and MIPI (registered trademark), LVDS, subLVDS, HDMI (registered trademark), DisplayPort (registered trademark), SDI, and the like are assumed.

The display device 640 receives the image data by the receiving unit 641. The image data received by the receiving unit 641 is converted from digital data to analog data by the DA conversion unit 642. The analog data converted by the DA conversion unit 642 is converted into light emission characteristics according to the display unit 644 by the light emission characteristic conversion unit 643 and displayed on the display unit 644.

As described above, even when the display system of the present embodiment shows the display image through the lens at the rear stage of the display unit 644 like VR glasses and electronic binoculars, the HDR display floor is corrected while correcting the distortion of the lens. It is possible to minimize the failure.

[Embodiment 4] Next, the fourth embodiment will be described.

FIG. 7 is a block diagram illustrating the configuration of the display system of the fourth embodiment.

The system of the fourth embodiment includes an image generation device 700, an external data transmission line 720 with a precision of 10 bits or less, and a display device 740. The image generation device 700 receives the image data input from the external device by the receiving unit 701. The image processing unit 702 performs image processing on the image data received by the receiving unit 701. The image-processed data is converted into HDR OETF by the HDR OETF conversion unit 703. The image data converted to HDR OETF is output from the image generator 700 to an external device by the transmission unit 704. The image data output by the transmission unit 704 is input to the display device 740 through the external data transmission path 720. The external data transmission line 720 is a data transmission line dedicated to image data, and MIPI (registered trademark), LVDS, subLVDS, HDMI (registered trademark), DisplayPort (registered trademark), SDI, and the like are assumed.

The display device 740 receives the image data by the receiving unit 741. The image data received by the receiving unit 741 is subjected to the inverse conversion of the light emitting characteristics by the light emitting characteristic inverse conversion unit 742. The image data obtained by reverse conversion of the light emission characteristics is converted from digital data to analog data by the DA conversion unit 743. The analog data converted by the DA conversion unit 743 is converted into light emission characteristics according to the display unit 745 by the light emission characteristic conversion unit 744 and displayed on the display unit 745.

Compared with the third embodiment, in the fourth embodiment, the light emission characteristic inverse conversion unit 603 is replaced with the HDR OETF conversion unit 703. As described above, even when the display system of the present embodiment shows the display image through the lens at the rear stage of the display unit 644 like VR glasses and electronic binoculars, the HDR display floor is corrected while correcting the distortion of the lens. It is possible to minimize the failure.

In the present embodiment, in the display system as in the third embodiment, the reverse conversion of the display unit 745 to the light emission characteristics is performed by the display device 740, and the image data of the external data transmission line 720 is the data conforming to the existing standard. It is effective when you want to.

[Embodiment 5] Next, the fifth embodiment will be described.

FIG. 11 is a block diagram illustrating the configuration of the display system of the fifth embodiment.

The system of the fifth embodiment is an image generator 700 capable of processing with a precision of 10 bits or more, an external data transmission line 720 with a precision of 10 bits or less, and a display corresponding to a color gamut (ITU BT.709) conforming to the SDR standard. Includes device 740. The image generation device 700 receives the image data input from the external device by the receiving unit 701. The image processing unit 702 performs image processing on the image data received by the receiving unit 701. The image-processed data is converted into HDR OETF by the HDR OETF conversion unit 703. The color gamut conversion unit 1101 converts the color gamut into a color gamut that matches the display performance of the display device 740, and converts it into the bit accuracy of the external data transmission line 720. As shown in FIG. 12, the color gamut conversion unit 1101 includes an inverse gamma conversion unit 1201, a color gamut calculation unit 1202, and a gamma conversion unit 1203.

Next, the configuration of the color gamut conversion unit 1101 will be described using the OETF shown in FIG. 13 and the chromaticity characteristics shown in FIG.

Since image data having linear characteristics not subjected to OETF processing is required to perform the color gamut conversion calculation, the inverse gamma conversion unit 1201 performs the inverse conversion processing of OETF converted by the HDR OETF conversion unit 703. .. The color gamut calculation unit 1202 performs an operation for color gamut conversion, and the gamma conversion unit 1203 again converts to the OETF set by the HDR OETF conversion unit 703.

For example, while recording image data in a color gamut (ITU BT. 2100) conforming to the HDR standard, ITU BT. When displaying an image on a display device corresponding to 709, the inverse gamma conversion unit 1201 converts the characteristic 1301 of the SMPTE ST 2084 into the image data of the linear characteristic 1302, and the color gamut calculation unit 1202 uses the ITU BT. From the color gamut 1401 of 2100 to ITU BT. The conversion of 709 to the color gamut 1402 is performed. The gamma conversion unit 1203 converts the image data of the linear characteristic 1302 into the characteristic 1301 of the SMPTE ST 2084.

The image data converted into the HDR OETF and SDR color gamuts is output from the image generator 700 to an external device by the transmission unit 704. The image data output from the transmission unit 704 is input to the display device 740 through the external data transmission path 720. The external data transmission line 720 is a data transmission line dedicated to image data, and MIPI (registered trademark), LVDS, subLVDS, HDMI (registered trademark), DisplayPort (registered trademark), SDI, and the like are assumed.

The display device 740 receives the image data by the receiving unit 741. The image data received by the receiving unit 741 is subjected to the inverse conversion process of the light emitting characteristic by the light emitting characteristic inverse conversion unit 742. The image data that has undergone the inverse conversion process of the light emission characteristics is converted from digital data to analog data by the DA conversion unit 743. The analog data converted by the DA conversion unit 743 is converted into light emission characteristics according to the display unit 745 by the light emission characteristic conversion unit 744 and displayed on the display unit 745.

As described above, when the image data of the external data transmission line 720 is the image data conforming to the existing standard, and in the present embodiment, the OETF of HDR which is close to the light emission characteristics such as OLED is selected, the color gamut is also HDR. ITU BT. Data transfer by 2100 is desirable. In this case, ITU BT. From 2100 to ITU BT. The color gamut conversion process of 709 is performed on a display device having 10 bits or less.

The image data of the external data transmission line 720 has an ITU BT having a color gamut equivalent to SDR. 709, gamma becomes SMPTE ST 2084 equivalent to HDR, and it is no longer data compliant with standards such as HDR and SDR, but it is highly accurate by performing color gamut conversion processing with an image generator that supports processing of 10 bits or more. Conversion processing becomes possible.

It should be noted that this embodiment can also be combined with the image generation device 400 of FIG. 4 of the above-mentioned second embodiment and the image generation device 600 of FIG. 6 of the third embodiment. In that case, the image data generated by the HDR OETF conversion unit 408 of the image generation device 400 of FIG. 4 and the emission characteristic inverse conversion unit 603 of the image generation device 600 of FIG. 6 is displayed by the color gamut conversion unit 1101 of the display performance of the display device. It may be converted into a color gamut according to the above and converted into bit accuracy of an external data transmission line.

The EVF also has a playback mode for displaying image data recorded on a memory card or the like on the EVF, in addition to the function of confirming the subject before shooting, which follows the OVF. As for image files recorded on memory cards and the like, there are many formats such as SDR and HDR that claim luminance characteristics close to those of human vision. These formats differ in maximum luminance and luminance characteristics. When these formats are displayed on the EVF as they are, for example, SDR is displayed very dark and HDR is displayed bright. In addition, the difference in maximum brightness for each HDR also causes a difference in brightness for each image. The display brightness can be adjusted by changing the amount of current applied to the display panel on the EVF side, but the emission characteristics are also affected, so gamma adjustment is required for each input image.

[Embodiment 6] Next, the sixth embodiment will be described.

FIG. 15 is a block diagram illustrating the configuration of the display system of the sixth embodiment for eliminating the difference in brightness for each image described above.

The system of the sixth embodiment is an image generator 700 capable of processing with a precision of 10 bits or more, an external data transmission line 720 with a precision of 10 bits or less, and a display corresponding to a color gamut (ITU BT.709) conforming to the SDR standard. Includes device 740. The image generation device 700 receives the image data input from the external device by the receiving unit 701. The image processing unit 702 performs image processing on the image data received by the receiving unit 701. The image-processed data is converted into HDR OETF by the HDR OETF conversion unit 703. The gain adding unit 1501 uses the gain value set by the gain setting unit 1502 to add a gain for adjusting the brightness displayed on the display device 740 to the input data. As shown in FIG. 16, the gain addition unit 1501 includes an inverse gamma conversion unit 1601, a gain calculation unit 1602, and a gamma conversion unit 1603.

Next, the configuration of the gain addition unit 1501 will be described using the OETF shown in FIG. In order to perform the calculation for adding the gain, image data having linear characteristics without OETF processing is required. Therefore, the inverse gamma conversion unit 1601 performs the inverse conversion process of the OETF converted by the HDR OETF conversion unit 703. The gain calculation unit 1602 performs an operation for adding a gain. The gamma conversion unit 1603 again converts to the OETF set by the HDR OETF conversion unit 703.

Specifically, the gain calculation unit 1602 outputs the result of adding the gain by multiplying the input data by the gain value using the gain value set by the gain setting unit 1502 shown in FIG. 15 such as a user operation. .. For example, using the following equation 1, the input data rin, gin, and bin of each of R, G, and B are multiplied by the gain value x, and the data runout, goout, and out are output.
(Equation 1)
runout = x * rin
gout = x * gin
out = x * bin
The image data converted into the HDR OETF and SDR color gamuts is output from the image generator 700 to an external device by the transmission unit 704. The image data output from the transmission unit 704 is input to the display device 740 through the external data transmission path 720. The external data transmission line 720 is a data transmission line dedicated to image data, and MIPI (registered trademark), LVDS, subLVDS, HDMI (registered trademark), DisplayPort (registered trademark), SDI, and the like are assumed.

The display device 740 receives the image data by the receiving unit 741. The image data received by the receiving unit 741 is subjected to the inverse conversion process of the light emitting characteristic by the light emitting characteristic inverse conversion unit 742. The image data that has undergone the inverse conversion process of the light emission characteristics is converted from digital data to analog data by the DA conversion unit 743. The analog data converted by the DA conversion unit 743 is converted into light emission characteristics according to the display unit 745 by the light emission characteristic conversion unit 744 and displayed on the display unit 745.

In this way, by applying the gain in the linear space on the image processing engine side, even in the content in which SDR, HDR, etc. are mixed, it is possible to display the content according to the maximum brightness of the OLED without any difference in brightness.

[Embodiment 7] Next, the seventh embodiment will be described.

FIG. 17 is a block diagram illustrating the configuration of the display system of the seventh embodiment for eliminating the difference in brightness for each image described above.

The system of the seventh embodiment is an image generator 700 capable of processing with a precision of 10 bits or more, an external data transmission line 720 with a precision of 10 bits or less, and a display corresponding to a color gamut (ITU BT.709) conforming to the SDR standard. Includes device 740. The image generation device 700 receives the image data input from the external device by the receiving unit 701. The image processing unit 702 performs image processing on the image data received by the receiving unit 701. The image-processed data is converted into HDR OETF by the HDR OETF conversion unit 703. The color gamut conversion unit 1101 converts the color gamut into a color gamut that matches the display performance of the display device 740, and converts it into the bit accuracy of the external data transmission line 720. Further, the gain setting unit 1702 is used for the calculation of the color gamut conversion by the color gamut conversion unit 1101, but sets the gain value. As shown in FIG. 12, the color gamut conversion unit 1101 includes an inverse gamma conversion unit 1201, a color gamut calculation unit 1202, and a gamma conversion unit 1203.

Next, the configuration of the color gamut conversion unit 1101 will be described using the OETF shown in FIG. 13 and the chromaticity characteristics shown in FIG.

In order to perform the color gamut conversion operation, image data having linear characteristics without OETF processing is required. Therefore, the inverse gamma conversion unit 1201 performs the inverse conversion process of the OETF converted by the HDR OETF conversion unit 703. The color gamut calculation unit 1202 performs an operation for color gamut conversion. The gamma conversion unit 1203 again converts to the OETF set by the HDR OETF conversion unit 703.

また、色域演算部１２０２は、ゲイン演算の機能を有し、ユーザ操作等、図１７に示すゲイン設定部１７０２により設定したゲイン値を用いて、色域演算部１２０２のマトリクス係数一律にゲイン値を乗算することにより、ゲインを付加した結果を出力する。例えば、以下の式３を用いて、Ｒ、Ｇ、Ｂ各々の入力データｒｉｎ、ｇｉｎ、ｂｉｎに対し、ゲイン値xを乗算した係数ａ＊ｘ～ｉ＊ｘのマトリクス演算を行い、データｒｏｕｔ’、ｇｏｕｔ’、ｂｏｕｔ’を出力する。
（式３）

ガンマ変換部１２０３は、線形特性１３０２の画像データをＳＭＰＴＥ ＳＴ ２０８４の特性１３０１に変換する。 For example, while recording image data in a color gamut (ITU BT. 2100) conforming to the HDR standard, ITU BT. When displaying an image on a display device corresponding to 709, the inverse gamma conversion unit 1201 converts the characteristic 1301 of the SMPTE ST 2084 into the image data of the linear characteristic 1302, and the color gamut calculation unit 1202 uses the ITU BT. From the color gamut 1401 of 2100 to ITU BT. The conversion of 709 to the color gamut 1402 is performed. For example, using the following equation 2, 3x3 matrix operations with coefficients a to i are performed on the input data rin, gin, and bin of each of R, G, and B, and the data runout, goout, and out are output.
(Equation 2)

Further, the color gamut calculation unit 1202 has a gain calculation function, and the gain value is uniformly set by the gain setting unit 1702 shown in FIG. 17 for user operation or the like, and the matrix coefficient of the color gamut calculation unit 1202 is uniformly gained. By multiplying by, the result with the gain added is output. For example, using the following equation 3, a matrix operation of coefficients a * x to i * x obtained by multiplying the input data rin, gin, and bin of each of R, G, and B by the gain value x is performed, and the data runout' , Gout', out' are output.
(Equation 3)

The gamma conversion unit 1203 converts the image data of the linear characteristic 1302 into the characteristic 1301 of the SMPTE ST 2084.

The image data converted into the HDR OETF and SDR color gamuts is output from the image generator 700 to an external device by the transmission unit 704. The image data output from the transmission unit 704 is input to the display device 740 through the external data transmission path 720. The external data transmission line 720 is a data transmission line dedicated to image data, and MIPI (registered trademark), LVDS, subLVDS, HDMI (registered trademark), DisplayPort (registered trademark), SDI, and the like are assumed.

The display device 740 receives the image data by the receiving unit 741. The image data received by the receiving unit 741 is subjected to the inverse conversion process of the light emitting characteristic by the light emitting characteristic inverse conversion unit 742. The image data that has undergone the inverse conversion process of the light emission characteristics is converted from digital data to analog data by the DA conversion unit 743. The analog data converted by the DA conversion unit 743 is converted into light emission characteristics according to the display unit 745 by the light emission characteristic conversion unit 744 and displayed on the display unit 745.

In this way, by applying the gain in the linear space on the image processing engine side, even in the content in which SDR, HDR, etc. are mixed, it is possible to display the content according to the maximum brightness of the OLED without any difference in brightness.

[Other embodiments]
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.

The invention is not limited to the above embodiment, and various modifications and modifications can be made without departing from the spirit and scope of the invention. Therefore, a claim is attached to publicize the scope of the invention.

200, 400, 600, 700 ... Image generator, 240, 440, 640, 740 ... Display device, 208, 242, 442, 603, 742 ... Emission characteristic inverse converter, 220, 420, 620, 720 ... External data transmission Road, 246, 445, 644, 745 ... Display unit

Claims (29)

An image generation device that outputs image data through an external data transmission path to a display device having a display unit capable of displaying an HDR (High Dynamic Range) image or an SDR (Standard Dynamic Range) image. ,
A light emission characteristic inverse conversion means that reversely converts the light emission characteristics of the display unit with respect to image data,
The light emitting characteristics of the display unit are close to the EOTF (Electro-Optical Transfer Function) of the HDR, and the bit accuracy of the image data output from the image generator is equal to or higher than the bit accuracy of the external data transmission path. Further, when displaying the HDR image on the display unit, the display unit has a transmission means for transmitting the image data generated by the light emission characteristic inverse conversion means to the display device through the external data transmission path. A featured image generator. An image generation device that outputs image data through an external data transmission path to a display device having a display unit capable of displaying an HDR (High Dynamic Range) image or an SDR (Standard Dynamic Range) image. ,
HDR OETF (Optical-Electro Transfer Function Function) conversion means for converting image data based on HDR OETF, and
The light emitting characteristics of the display unit are close to the EOTF (Electro-Optical Transfer Function) of the HDR, and the bit accuracy of the image data output from the image generator is higher than the bit accuracy of the external data transmission path. Further, when displaying the HDR image on the display unit, the display unit includes a transmission means for transmitting the image data generated by the HDR OETF conversion means to the display device through the external data transmission path. Image generator. The emission characteristic of the display unit is close to the EOTF (Electro-Optical Transfer Function) of the HDR, that is, the sum of squares of the difference between the emission characteristic of the display unit and the EOTF of the HDR is the emission characteristic of the display unit and the above. The image generator according to claim 1 or 2, wherein the SDR is smaller than the sum of squares of the difference from the EOTF. HDR OETF conversion means for converting image data based on HDR OETF,
Further, it has an SDR OETF conversion means for converting image data based on the SDR OETF.
The image generation device according to claim 1, wherein the light emission characteristic reverse conversion means performs reverse conversion of the light emission characteristics of the display unit with respect to the image data generated by the HDR OETF conversion means. OETF conversion means for converting image data based on OETF,
Further, it has an SDR OETF conversion means for converting image data based on the SDR OETF.
When the image data generated by the OETF conversion means is the image data based on the SDR OETF, the HDR OETF conversion means converts the image data into the image data based on the HDR OETF.
The SDR OETF conversion means is characterized in that, when the image data generated by the OETF conversion means is the image data based on the OETF of the HDR, the SDR OETF conversion means converts the image data into the image data based on the OETF of the SDR. 2. The image generator according to 2. The display unit is an organic EL and is
The HDR EOTF is SMPTE STANDARD 2084.
The SDR EOTF is RECOMMENDATION ITU-R BT. The image generator according to claim 3, wherein the image is 709. The external data transmission line has a bit accuracy of 10 bits or less, and has a bit accuracy of 10 bits or less.
With MIPI (Mobile Industry Processor Interface) (registered trademark), LVDS (Low Voltage Differential Signaling), subLVDS, HDMI (High-Definition Multimedia Interface) (registered trademark), DisplayPort (registered trademark), or SDI (Serial Digital Interface). The image generator according to any one of claims 1 to 6, wherein the image generator is provided. Further, it has a color gamut conversion means for converting the image data generated by the light emission characteristic inverse conversion means into a color gamut that matches the display performance of the display unit.
The color gamut conversion means is
An inverse gamma conversion means for converting image data generated by the emission characteristic inverse conversion means into linear gamma, and an inverse gamma conversion means.
A color gamut calculation means for converting image data generated by the inverse gamma conversion means into the color gamut of the display unit, and
The image according to claim 1, further comprising a gamma conversion means for converting image data obtained by the color gamut calculation means into gamma similar to the image data generated by the emission characteristic inverse conversion means. Generator. Further, it has a color gamut conversion means for converting the image data generated by the HDR OETF conversion means into a color gamut that matches the display performance of the display unit.
The color gamut conversion means is
An inverse gamma conversion means for converting image data generated by the HDR OETF conversion means into linear gamma, and an inverse gamma conversion means.
A color gamut calculation means for converting image data generated by the inverse gamma conversion means into the color gamut of the display unit, and
The second or fifth aspect of claim 2 or 5, wherein the gamma conversion means for converting the image data obtained by the color gamut calculation means into the same gamma as the image data generated by the HDR OETF conversion means is included. Image generator. Further, it has a color gamut conversion means for converting the image data generated by the light emission characteristic inverse conversion means into a color gamut that matches the display performance of the display unit.
The color gamut conversion means is
An inverse gamma conversion means for converting image data generated by the emission characteristic inverse conversion means into linear gamma, and an inverse gamma conversion means.
A gain calculation means for adding a gain to the image data generated by the inverse gamma conversion means, and a gain calculation means.
The image generation according to claim 1, further comprising a gamma conversion means for converting image data obtained by the gain calculation means into gamma similar to the image data generated by the emission characteristic inverse conversion means. Device. Further, it has a color gamut conversion means for converting the image data generated by the HDR OETF conversion means into a color gamut that matches the display performance of the display unit.
The color gamut conversion means is
An inverse gamma conversion means for converting image data generated by the HDR OETF conversion means into linear gamma, and an inverse gamma conversion means.
A gain calculation means for adding a gain to the image data generated by the inverse gamma conversion means, and a gain calculation means.
The image according to claim 2 or 5, further comprising a gamma conversion means for converting image data obtained by the gain calculation means into gamma similar to the image data generated by the HDR OETF conversion means. Generator. The image generation device according to claim 10, wherein the gain calculation means has a function of matrix calculation and also serves as color gamut calculation. The image generation apparatus according to any one of claims 8 to 12, wherein the color gamut of the image data generated by the inverse gamma conversion means corresponds to the color gamut of HDR. The image generation device according to any one of claims 8 to 13, wherein the color gamut of the display unit corresponds to the color gamut of SDR. Further having a first image selection means for selecting either the image data generated by the light emission characteristic inverse conversion means or the image data generated by the SDR OETF conversion means.
The image generation device according to claim 4, wherein the image data selected by the first image selection means is output to the display device through the external data transmission path. Further having a first image selection means for selecting one of the image data generated by the HDR OETF conversion means and the image data generated by the SDR OETF conversion means.
The image generation device according to claim 5, wherein the image data selected by the first image selection means is output to the display device through the external data transmission path. When the first image selection means determines that the light emission characteristics of the display unit are not close to the EOTF of the HDR, the first image selection means selects the image data generated by the SDR OETF conversion means and selects the image data of the display unit. When it is determined that the light emission characteristics are close to the EOTF of the HDR, the bit accuracy of the image data generated by the OETF conversion means is compared with the bit accuracy of the external data transmission path.
When the first image selection means determines that the bit accuracy of the image data generated by the OETF conversion means is smaller than the bit accuracy of the external data transmission path, the image data generated by the SDR OETF conversion means. If it is determined that the bit accuracy of the image data generated by the OETF conversion means is equal to or higher than the bit accuracy of the external data transmission path, it is determined whether or not the image to be displayed is HDR.
When the first image selection means determines that the image to be displayed is not HDR, the first image selection means selects the image data generated by the SDR OETF conversion means, and when it is determined that the image to be displayed is HDR, the first image selection means selects HDR. The image generation device according to claim 15, wherein the image data generated by the light emission characteristic inverse conversion means is selected. When the first image selection means determines that the light emission characteristics of the display unit are not close to the EOTF of the HDR, the first image selection means selects the image data generated by the SDR OETF conversion means and selects the image data of the display unit. When it is determined that the light emission characteristics are close to the EOTF of the HDR, the bit accuracy of the image data generated by the OETF conversion means is compared with the bit accuracy of the external data transmission path.
When the first image selection means determines that the bit accuracy of the image data generated by the OETF conversion means is smaller than the bit accuracy of the external data transmission path, the image data generated by the SDR OETF conversion means. If it is determined that the bit accuracy of the image data generated by the OETF conversion means is equal to or higher than the bit accuracy of the external data transmission path, it is determined whether or not the image to be displayed is HDR.
When the first image selection means determines that the image to be displayed is not HDR, the first image selection means selects the image data generated by the SDR OETF conversion means, and when it is determined that the image to be displayed is HDR, the first image selection means selects. The image generation device according to claim 16, wherein the image data generated by the HDR OETF conversion means is selected. A display unit capable of displaying an HDR (High Dynamic Range) image or an SDR (Standard Dynamic Range) image, and a display unit.
A receiving means for receiving image data from an image generator through an external data transmission line,
A light emission characteristic inverse conversion means that reversely converts the light emission characteristics of the display unit with respect to the image data received from the image generation device.
A display device comprising: a light emission characteristic conversion means for outputting image data converted into light emission characteristics according to the display unit to the display unit. 19. The display device according to claim 19, further comprising an image selection means for selecting either image data received from the image generation device or image data generated by the emission characteristic inverse conversion means. When the image data converted based on the OETF of SDR is selected in the image generation device, the image selection means selects the image data of the emission characteristic inverse conversion means and displays the image in the image generation device. The display device according to claim 20, wherein when the image data generated by performing the inverse conversion of the light emission characteristics of the unit is selected, the image data received from the image generation device is selected. 19. The display device according to claim 19, wherein the receiving means receives image data converted based on SDR OETF or image data converted based on HDR OETF in the image generation device. A control method of an image generation device that outputs image data through an external data transmission path to a display device having a display unit capable of displaying an HDR (High Dynamic Range) image or an SDR (Standard Dynamic Range) image. And,
A step of inversely converting the light emission characteristics of the display unit for image data,
The light emitting characteristics of the display unit are close to the EOTF (Electro-Optical Transfer Function) of the HDR, and the bit accuracy of the image data output from the image generator is equal to or higher than the bit accuracy of the external data transmission path. A control method comprising:, when displaying the HDR image on the display unit, a step of transmitting the inversely converted image data to the display device through the external data transmission path. A control method of an image generation device that outputs image data through an external data transmission path to a display device having a display unit capable of displaying an HDR (High Dynamic Range) image or an SDR (Standard Dynamic Range) image. And,
Steps to convert image data based on HDR OETF,
The light emission characteristics of the display unit are close to the EOTF (Electro-Optical Transfer Function) of the HDR, and the bit accuracy of the image data output from the image generator is equal to or higher than the bit accuracy of the external data transmission path. Further, when displaying the HDR image on the display unit, the display unit includes a step of transmitting the image data converted based on the HDR OETF to the display device through the external data transmission path. Control method to do. A control method for a display device having a display unit capable of displaying an HDR (High Dynamic Range) image or an SDR (Standard Dynamic Range) image.
The step of receiving image data from an image generator through an external data transmission line,
A step of inversely converting the light emission characteristics of the display unit with respect to the image data received from the image generator, and
A control method comprising: a step of outputting image data converted into light emission characteristics according to the display unit to the display unit. A program for causing a computer to execute the control method according to any one of claims 23 to 25. A storage medium that can be read by a computer that stores a program for causing a computer to execute the control method according to any one of claims 23 to 25. A system in which image data generated by an image generator is output to a display device through an external data transmission line.
The display device has a display unit capable of displaying an HDR (High Dynamic Range) image or an SDR (Standard Dynamic Range) image.
The image generation device has a light emission characteristic inverse conversion means that reversely converts the light emission characteristics of the display unit with respect to image data.
The light emitting characteristics of the display unit are close to the EOTF (Electro-Optical Transfer Function) of the HDR, and the bit accuracy of the image data output from the image generator is equal to or higher than the bit accuracy of the external data transmission path. The system is characterized in that, when displaying the HDR image on the display unit, the image data generated by the light emission characteristic inverse conversion means is output to the display device through the external data transmission path. A system in which image data generated by an image generator is output to a display device through an external data transmission line.
The display device has a display unit capable of displaying an HDR (High Dynamic Range) image or an SDR (Standard Dynamic Range) image.
The image generator has HDR OETF (Optical-Electro Transfer Function Function) conversion means for converting image data based on HDR OETF.
The light emission characteristics of the display unit are close to the EOTF (Electro-Optical Transfer Function) of the HDR, and the bit accuracy of the image data output from the image generator is equal to or higher than the bit accuracy of the external data transmission path. The system is characterized in that, when displaying the HDR image on the display unit, the image data generated by the HDR OETF conversion means is output to the display device through the external data transmission path.

Images