Luma-based chroma intra-prediction for video coding
AssigneeTexas Instruments Incorporated
InventorMadhukar Budagavi
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Abstract
A method for luma-based chroma intra-prediction in a video encoder or a video decoder is provided that includes filtering reconstructed neighboring samples of a reconstructed down sampled luma block, computing parameters α and β of a linear model using the filtered, reconstructed neighboring samples of the reconstructed down sampled luma block and reconstructed neighboring samples of a corresponding chroma block, wherein the linear model is PredC[x,y]=α·RecL′[x,y]+β, wherein x and y are sample coordinates, PredC is predicted chroma samples, and RecL′ is samples of the reconstructed down sampled luma block, and computing samples of a predicted chroma block from corresponding samples of the reconstructed down sampled luma block using the linear model and the parameters.
Claims13
A method for luma-based chroma intra-prediction in a video encoder or a video decoder, the method comprising:
- filtering reconstructed neighboring samples of a reconstructed down sampled luma block;
- computing parameters α and β of a linear model using the filtered, reconstructed neighboring samples of the reconstructed down sampled luma block and reconstructed neighboring samples of a corresponding chroma block, wherein the linear model is PredC[x,y]=α·RecL′[x,y]+β, wherein x and y are sample coordinates, PredC is predicted chroma samples, and RecL′ is samples of the reconstructed down sampled luma block;
- computing samples of a predicted chroma block from corresponding samples of the reconstructed down sampled luma block using the linear model and the parameters;
- receiving predicted left neighboring samples of the corresponding chroma block and of the reconstructed down sampled luma block;
- and
- wherein computing parameters α and β comprises computing the parameters using the predicted left neighboring samples of the corresponding chroma block and of the reconstructed down sampled luma block, the filtered, reconstructed neighboring samples of the reconstructed down sampled luma block, and the reconstructed neighboring samples of the corresponding chroma block, wherein the reconstructed neighboring samples of the reconstructed down sampled luma block consist of reconstructed to neighboring samples of the reconstructed down sampled luma block, and the reconstructed neighboring samples of the corresponding chroma block consist of reconstructed top neighboring samples of the corresponding chroma block.
A method for luma-based chroma intra-prediction in a video encoder or a video decoder, the method comprising:
- filtering reconstructed neighboring samples of a reconstructed down sampled luma block;
- computing parameters α and β of a linear model using reconstructed neighboring samples of a reconstructed down sampled luma block and of a corresponding chroma block, wherein the linear model is PredC[x,y]=α·RecL′[x,y]+β, wherein x and y are sample coordinates, PredC is predicted chroma samples, and RecL′ is samples of the reconstructed down sampled luma block;
- normalizing the parameter α;
- computing samples of a predicted chroma block from corresponding samples of the reconstructed down sampled luma block using the linear model and the parameters;
- receiving predicted left neighboring samples of the corresponding chroma block and of the reconstructed down sampled luma block;
- and
- wherein computing parameters α and β comprises computing the parameters using the predicted left neighboring samples of the corresponding chroma block and of the reconstructed down sampled luma block, the filtered, reconstructed neighboring samples of the reconstructed down sampled luma block, and the reconstructed neighboring samples of the corresponding chroma block, wherein the reconstructed neighboring samples of the reconstructed down sampled luma block consist of reconstructed to neighboring samples of the reconstructed down sampled luma block, and the reconstructed neighboring samples of the corresponding chroma block consist of reconstructed to neighboring samples of the corresponding chroma block.
Dependencies are inferred from the claim text.