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US 12,593,035 B2Granted
Image encoding/decoding method and device
AssigneeDolby International AB
InventorsBae Keun Lee, Dong San Jun
Life of this patent
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Abstract
The video encoding/decoding method and device according to the present invention can determine an intra prediction mode of a chroma block, specify a luminance area for inter-component reference of the chroma block, downsample the specified luminance area, derive parameters for the inter-component reference of the chroma block, apply the parameters to the downsampled luminance area, and thereby predict the chroma block.
Claims12
An image decoding method, comprising:
- determining an intra prediction mode of a chroma block;
- determining a neighboring region for inter-component reference of the chroma block based on the intra prediction mode, the neighboring region including at least one of a top neighboring region or a left neighboring region adjacent to a luma block corresponding to the chroma block;
- deriving down-sampled neighboring luma samples by down-sampling neighboring luma samples in the neighboring region,
- deriving a parameter for the inter-component reference of the chroma block based on the down-sampled neighboring luma samples;
- and
- predicting the chroma block based on the parameter for the inter-component reference,
- wherein deriving the parameter for the inter-component reference comprises:
- classifying the down-sampled neighboring luma samples into a first group and a second group, the first group including down-sampled neighboring luma samples having relatively large values and the second group including down-sampled neighboring luma samples having relatively small values;
- and
- calculating a maximum value by averaging the down-sampled neighboring luma samples included in the first group and a minimum value by averaging the down-sampled neighboring luma samples included in the second group,
- wherein the parameter for the inter-component reference is derived based on a difference between the maximum value and the minimum value,
- wherein the parameter for the inter-component reference includes at least one of a weight or an offset,
- wherein when the top neighboring region belongs to a different coding tree unit from the luma block, only three neighboring luma samples are used to derive one down-sampled neighboring luma sample, and
- wherein when the top neighboring region belongs to a same coding tree unit as the luma block, five or six neighboring luma samples are used to derive the one down-sampled neighboring luma sample.
11 more elements
An image encoding method, comprising:
- determining an intra prediction mode for a chroma block;
- determining a neighboring region for inter-component reference of the chroma block based on the intra prediction mode, the neighboring region including at least one of a top neighboring region or a left neighboring region adjacent to a luma block corresponding to the chroma block;
- deriving down-sampled neighboring luma samples by down-sampling neighboring luma samples in the neighboring region,
- deriving a parameter for the inter-component reference of the chroma block based on the down-sampled neighboring luma samples;
- and
- predicting the chroma block based on the parameter for the inter-component reference,
- wherein deriving the parameter for the inter-component reference comprises:
- classifying the down-sampled neighboring luma samples into a first group and a second group, the first group including down-sampled neighboring luma samples having relatively large values and the second group including down-sampled neighboring luma samples having relatively small values;
- and
- calculating a maximum value by averaging the down-sampled neighboring luma samples included in the first group and a minimum value by averaging the down-sampled neighboring luma samples included in the second group,
- wherein the parameter for the inter-component reference is derived based on a difference between the maximum value and the minimum value,
- wherein the parameter for the inter-component reference includes at least one of a weight or an offset,
- wherein when the top neighboring region belongs to a different coding tree unit from the luma block, only three neighboring luma samples are used to derive one down-sample neighboring luma sample, and
- wherein when the top neighboring region belongs to a same coding tree unit as the luma block, five or six neighboring luma samples are used to derive the one down-sample neighboring luma sample.
11 more elements
Dependencies are inferred from the claim text.