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US 12,120,299 B2Granted
Image or video coding based on color space conversion
AssigneeLG Electronics Inc.
InventorsJie Zhao, Seunghwan Kim
Life of this patent
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Abstract
According to the disclosure of this document, it is possible to derive a residual sample by applying an adaptive color transform (ACT) to a current block on the basis of ACT-related information, and at this time, the residual sample is clipped and derived on the basis of a clipping range, wherein the clipping range is determined on the basis of a bit depth.
Claims3
An image decoding method performed by a decoding apparatus,
- the method comprising:
- obtaining image information including residual information and prediction mode information from a bitstream;
- deriving a prediction sample for a current block based on the prediction mode information;
- deriving a residual sample for the current block based on the residual information;
- and
- generating a reconstructed sample based on the residual sample and the prediction sample,
- wherein the image information includes adaptive color transform (ACT)-related information,
- wherein whether to apply an ACT to the residual sample of the current block is determined based on the ACT-related information,
- wherein based on the ACT-related information representing that the ACT is applied, clipping is performed on the residual sample to apply the ACT,
- wherein the clipping is performed by a clipping range determined based on a bit depth (BitDepth),
- wherein the clipping range includes a clipping range for a luma component and a clipping range for a chroma component,
- wherein the clipping range for the luma component includes a range between −(1<<BitDepth) and (1<<BitDepth)−1, and
- wherein the clipping range for the chroma component includes a range between −(1<<(BitDepth+1)) and (1<<(BitDepth+1))−1.
10 more elements
An image encoding method performed by an encoding apparatus, the method comprising:
- deriving a prediction sample for a current block;
- generating prediction mode information;
- deriving a residual sample for the current block based on the prediction sample;
- generating residual information based on the residual sample;
- and
- encoding image information including the residual information and the prediction mode information,
- wherein the image information includes adaptive color transform (ACT)-related information,
- wherein whether to apply an ACT to the residual sample of the current block is determined based on the ACT-related information,
- wherein based on the ACT-related information representing that the ACT is applied, clipping is performed on the residual sample to apply the ACT,
- wherein the clipping is performed according to a clipping range determined based on a bit depth (BitDepth),
- wherein the clipping range includes a clipping range for a luma component and a clipping range for a chroma component,
- wherein the clipping range for the luma component includes a range between −(1<<BitDepth) and (1<<BitDepth)−1, and
- wherein the clipping range for the chroma component includes a range between −(1<<(BitDepth+1)) and (1<<(BitDepth+1))−1.
10 more elements
A non-transitory computer-readable storage medium storing a bitstream generated by an image encoding method, the image encoding method comprising:
- deriving a prediction sample for a current block;
- generating prediction mode information;
- deriving a residual sample for the current block based on the prediction sample;
- generating residual information based on the residual sample;
- and
- encoding image information including the residual information and the prediction mode information,
- wherein the image information includes adaptive color transform (ACT)-related information,
- wherein whether to apply an ACT to the residual sample of the current block is determined based on the ACT-related information,
- wherein based on the ACT-related information representing that the ACT is applied, clipping is performed on the residual sample to apply the ACT,
- wherein the clipping is performed according to a clipping range determined based on a bit depth (BitDepth),
- wherein the clipping range includes a clipping range for a luma component and a clipping range for a chroma component,
- wherein the clipping range for the luma component includes a range between −(1<<BitDepth) and (1<<BitDepth)−1, and
- wherein the clipping range for the chroma component includes a range between −(1<<(BitDepth+1)) and (1<<(BitDepth+1))−1.
10 more elements
Dependencies are inferred from the claim text.