Patent ID: 11930177
Assignee: TENCENT AMERICA LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. A non-transitory storage medium for storing computer readable instructions, the computer readable instructions, when executed by a processor of device for processing video data, causing the processor to:
receive 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;
obtain 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;
determine a first flag indicating that all transform coefficients in the first transform block are zero;
determine 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:
refine 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;
determine a target transform kernel for the refined first transform block;
perform a reverse transform on the refined first transform block based on the target transform kernel to obtain a target block; and
reconstruct the first color component of the video block based on at least the target block.