US 12,231,643 B2
Method and apparatus for video encoding and decoding with matrix based intra-prediction
Franck Galpin, Thorigne-Fouillard (FR); Fabien Racape, San Francisco, CA (US); Jean Begaint, Menlo Park, CA (US); Swayambhoo Jain, Milpitas, CA (US); and Shahab Hamidi-Rad, Sunnyvale, CA (US)
Assigned to InterDigital Madison Patent Holdings, SAS, Paris (FR)
Appl. No. 17/627,377
Filed by InterDigital Madison Patent Holdings, SAS, Paris (FR)
PCT Filed Jul. 1, 2020, PCT No. PCT/US2020/040471
§ 371(c)(1), (2) Date Jan. 14, 2022,
PCT Pub. No. WO2021/015935, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 19305969 (EP), filed on Jul. 22, 2019.
Prior Publication US 2022/0256161 A1, Aug. 11, 2022
Int. Cl. H04N 19/132 (2014.01); H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/132 (2014.11) [H04N 19/105 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/70 (2014.11)] 22 Claims
OG exemplary drawing
 
1. A method comprising:
encoding a block of a picture of a video in intra prediction mode using linear weighted prediction,
wherein the encoding comprises:
determining a set of n neighboring reference samples x;
selecting at least a first weight matrix G of size m×r, a second weight matrix HT of size r×n, and an associated bias vector b among a set of weight matrices and associated bias vectors based on a mode of linear weighted intra prediction and a block shape, the first weight matrix G having a size m×r and the second weight matrix HT having a size r×n, where m, n, r are integers with r smaller than m and r smaller than n; and
obtaining intra predicted samples ŷ of the block from a first product of matrices HTx, a second product of matrices G(HTx), and adding associated bias b resulting in ŷ=G(HTx)+b.