Texas Instruments Incorporated
Luma-based chroma intra-prediction for video coding

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 .alpha. and .beta. 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 Pred.sub.C[x,y]=.alpha.Rec.sub.L'[x,y]+.beta., wherein x and y are sample coordinates, Pred.sub.C is predicted chroma samples, and Rec.sub.L' 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.