Image processing method and related apparatus for high dynamic range and color gamut conversion

An image processing method, applied to a display apparatus, wherein the method comprises:

• receiving a target image sent by a photographing apparatus;
• and
• displaying the target image,
• wherein the target image is determined by the photographing apparatus based on a second RGB image and a first luminance value corresponding to the second RGB image, the second RGB image is converted from a first RGB image sensed by the photographing apparatus and meets a BT2020 color gamut range, and the first luminance value indicates a maximum luminance of each frame of image in the second RGB image,
• wherein after the receiving a target image sent by a photographing apparatus, the method further comprises:
• receiving the first luminance value sent by the photographing apparatus;
• and
• obtaining display information, wherein the display information indicates a display capability of the display apparatus;
• and
• the displaying the target image comprises:
• performing gamut mapping on the target image based on the first luminance value, the display information, and a preset gamut mapping policy, to display a target image obtained through gamut mapping.

A photographing apparatus, comprising at least one processor, and a memory storing information comprising instructions that, when executed by the at least one processor, control the photographing apparatus to perform operations comprising:

• obtaining a first RGB image sensed by the photographing apparatus;
• converting the first RGB image into a second RGB image meeting a BT2020 color gamut range, wherein
• determining a first luminance value corresponding to the second RGB image, wherein the first luminance value indicates a maximum luminance of each frame of image in the second RGB image;
• and
• determining a target image based on the first luminance value and the second RGB image;
• and
• sending the target image to a display apparatus, so that the display apparatus displays the target image,
• wherein the converting of the first RGB image into the second RGB image comprises:
• determining a first conversion matrix meeting the BT2020 color gamut range;
• and
• determining the second RGB image based on the first conversion matrix and the first RGB image,
• wherein, before the first luminance value corresponding to the second RGB image is determined, first information is obtained, and the first information indicates an aperture value, an exposure time, a gain value, or optical-to-electrical conversion efficiency of the photographing apparatus;
• and
• wherein the determining of the first luminance value corresponding to the second RGB image comprises:
• determining a second conversion matrix and a white balance matrix, wherein the second conversion matrix is used to indicate conversion between a luminance value of an RGB image sensed by the photographing apparatus and a luminance value of an image in a preset observer space;
• determining a second luminance value based on the second RGB image, the first conversion matrix, the second conversion matrix, the white balance matrix, and the first information, wherein the second luminance value indicates a luminance of each frame of image in the second RGB image;
• and
• determining the first luminance value based on the second luminance value, the first conversion matrix, the second conversion matrix, the white balance matrix, and the first information.