CPC H04N 19/12 (2014.11) [H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/186 (2014.11); H04N 19/46 (2014.11)] | 20 Claims |
1. A method for video processing, the method comprising:
receiving a bitstream of a video block comprising a first transform block of a first color component and a second transform block of a second color component, wherein the first transform block and the second transform blocks are co-located blocks;
obtaining the first transform block of the first color component and the second transform block of the second color component from the bitstream of the video block;
determining a first flag indicating that all transform coefficients in the first transform block are zero;
determining a second flag indicating that a cross component level reconstruction (CCLR) is applied to the first transform block; and
in response to determining that CCLR is applied to the first transform block:
refining one or more of the transform coefficients in the first transform block by adding one or more offset values, to obtain a refined first transform block, the one or more offset values being derived based on transform coefficients that are in the second transform block and are co-located with the one or more of the transform coefficients in the first transform block;
determining a target transform kernel for the refined first transform block;
performing a reverse transform on the refined first transform block based on the target transform kernel to obtain a target block; and
reconstructing the first color component of the video block based on at least the target block.
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