METHOD AND APPARATUS OF LUMA-BASED CHROMA INTRA PREDICTION

摘要

A method and apparatus for luma-based chroma intra prediction for a current chroma block are disclosed. The chroma intra predictor is derived from reconstructed luma pixels of a current luma block according to the chroma sampling format. Depending on the chroma sampling format, either sub-sampling, down-sampling or no processing is applied to the reconstructed luma pixels in horizontal or vertical direction. The information associated with the chroma sampling format can be incorporated in the sequence parameter set (SPS), the picture parameter set (PPS), the adaptation parameter set (APS) or the slice header of a video bitstream.

主权项

1. A method of chroma intra prediction based on reconstructed luma pixels, the method comprising:
receiving neighboring reconstructed luma pixels and current reconstructed luma pixels of a current luma block from storage or a processor, wherein the neighboring reconstructed luma pixels comprise a first group of the reconstructed luma pixels above a top boundary of the current luma block and a second group of the reconstructed luma pixels to a left boundary of the current luma block; determining a chroma sampling format; deriving chroma intra prediction for a corresponding chroma block based on the neighboring reconstructed luma pixels and the current reconstructed luma pixels of the current luma block, wherein said deriving chroma intra prediction is according to the chroma sampling format; and providing the chroma intra prediction for encoding or decoding of chroma pixels in the corresponding chroma.