Luma and chroma reshaping of HDR video encoding
AssigneeApple Inc.
InventorsMei Guo, Jun Xin, Jun Xu, Yeping Su, Chris Chung, Xiaosong Zhou, Hsi-Jung Wu
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Abstract
Systems and methods are disclosed for reshaping HDR video content to improve compression efficiency while using standard encoding/decoding techniques. Input HDR video frames, e.g., represented in an IPT color space, may be reshaped before the encoding/decoding process and the corresponding reconstructed HDR video frames may then be reverse reshaped. The disclosed reshaping methods may be combinations of scene-based or segment-based methods.
Claims30
A video coding method, comprising:
- receiving an input frame, comprising pixels represented according to components of a color model;
- reshaping at least one pixel's component to generate at least one reshaped component, wherein the reshaping comprises increasing a reshaping ratio as a function of a distance between a level of the pixel's component and a predetermined neutral level of the respective component;
- and
- coding the components, including the at least one reshaped component, using motion compensated predictive coding.
A computer system, comprising:
- at least one processor;
- at least one memory comprising instructions configured to be executed by the at least one processor to perform a method comprising:
- receiving an input frame, comprising pixels represented according to components of a color model;
- reshaping at least one pixel's component to generate at least one reshaped component, wherein the reshaping comprises increasing a reshaping ratio as a function of a distance between a level of the pixel's component and a predetermined neutral level of the respective component;
- and
- coding the components, including the at least one reshaped component, using motion compensated predictive coding.
A non-transitory computer-readable medium comprising instructions executable by at least one processor to perform a method, the method comprising:
- receiving an input frame, comprising pixels represented according to components of a color model;
- reshaping at least one pixel's component to generate at least one reshaped component, wherein the reshaping comprises increasing a reshaping ratio as a function of a distance between a level of the pixel's component and a predetermined neutral level of the respective component;
- and
- coding the components, including the at least one reshaped component, using motion compensated predictive coding.
Dependencies are inferred from the claim text.