METHOD AND APPARATUS OF SIMPLIFIED LUMA-BASED CHROMA INTRA PREDICTION

摘要

A method and apparatus for chroma intra prediction based on reconstructed luma pixels and chroma pixels are disclosed. The chroma intra prediction is based on a linear model of derived co-located current luma pixels of the current luma block scaled by a scaling factor. The scaling factor comprises a product term of a division factor and a scaled covariance-like value associated with neighboring reconstructed luma and chroma pixels of a current block. The division factor is related to a first data range divided with rounding by a scaled variance-like value associated with the neighboring reconstructed luma pixels of the current block. The scaled covariance-like value, the first data range, or both of the scaled covariance-like value and the first data range are dependent on the internal bit depth, with which the chroma signal is processed during video coding process, according to an embodiment of the present invention.

主权项

1. A method of chroma intra prediction based on reconstructed luma pixels and chroma pixels, the method comprising:
receiving neighboring reconstructed luma pixels and current reconstructed luma pixels of a current luma block from a media or a processor; receiving neighboring reconstructed chroma pixels of a current chroma block from the media or the processor, wherein the current chroma block is co-located with the current luma block; deriving chroma intra prediction for chroma pixels of the current chroma block based on derived co-located current luma pixels of the current luma block scaled by a scaling factor, wherein the scaling factor comprises a product term of a division factor and a scaled covariance-like value associated with the neighboring reconstructed luma pixels of the current luma block and the neighboring reconstructed chroma pixels of the current chroma block, wherein the division factor is related to a first data range divided with rounding by a scaled variance-like value associated with the neighboring reconstructed luma pixels of the current luma block, and wherein at least one of the scaled covariance-like value and the first data range is dependent on internal bit depth with which chroma signal is processed during video coding process; and providing the chroma intra prediction for encoding or decoding of the chroma pixels of the current chroma block.