US 12,126,794 B2
Adaptive transforms for compound inter-intra prediction modes
Madhu Peringassery Krishnan, Mountain View, CA (US); Xin Zhao, San Jose, CA (US); and Shan Liu, San Jose, CA (US)
Assigned to Tencent America LLC, Palo Alto, CA (US)
Filed by TENCENT AMERICA LLC, Palo Alto, CA (US)
Filed on Sep. 6, 2022, as Appl. No. 17/903,807.
Claims priority of provisional application 63/250,815, filed on Sep. 30, 2021.
Prior Publication US 2023/0100043 A1, Mar. 30, 2023
Int. Cl. H04N 19/105 (2014.01); H04N 19/132 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/132 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11)] 18 Claims
OG exemplary drawing
 
1. A method for decoding a block in a video stream, comprising:
determining that the block is predicted in a Compound Inter Intra Prediction (CIIP) mode, wherein the block is derived as a combination of an intra prediction and an inter prediction in the CIIP mode;
determining at least one inter intra prediction weighting configuration for the block;
identifying a data driven transform kernel for the block among a transform kernel set, the data driven transform kernel comprising one of a data-driven Line Graph Transform (LGT) kernel, a pre-trained Korhonen-Loève Transform kernel or a pre-trained Row-Colum Transform (RCT) kernel;
generating a residual block of the block by inverse transforming, using at least the data driven transform kernel, a set of transform coefficients extracted from the video stream for the block; and
deriving the block based on the residual block, the at least one inter intra prediction weighting configuration, at least one reconstructed inter prediction block of the block, and at least one reconstructed intra prediction reference sample of the block.