US 12,170,771 B2
Single-index quantization matrix design for video encoding and decoding
Philippe De Lagrange, Cesson-Sevigne (FR); Fabrice Leleannec, Cesson-Sevigne (FR); Karam Naser, Cesson-Sevigne (FR); Edouard Francois, Cesson-Sevigne (FR); Pierre Andrivon, Cesson-Sevigne (FR); and Ya Chen, Cesson-Sevigne (FR)
Assigned to InterDigital CE Patent Holdings, SAS, Paris (FR)
Appl. No. 17/603,168
Filed by InterDigital CE Patent Holdings, SAS, Paris (FR)
PCT Filed Jun. 16, 2020, PCT No. PCT/EP2020/066614
§ 371(c)(1), (2) Date Oct. 12, 2021,
PCT Pub. No. WO2020/254317, PCT Pub. Date Dec. 24, 2020.
Claims priority of application No. 19305802 (EP), filed on Jun. 21, 2019; and application No. 19305826 (EP), filed on Jun. 24, 2019.
Prior Publication US 2023/0232003 A1, Jul. 20, 2023
Int. Cl. H04N 19/126 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/126 (2014.11) [H04N 19/70 (2014.11)] 19 Claims
OG exemplary drawing
 
1. A method, comprising:
obtaining a single identifier used to identify a quantization matrix from a plurality of quantization matrices, based on a size identifier, a color component type, and a prediction mode parameter of a block to be decoded in a picture, wherein said single identifier is derived based on N*sizeId+matrixTypeId, where matrixTypeId indicates said color component type and said prediction mode parameter of said block, N is a number of possible type identifiers indicated by matrixTypeId, and sizeId indicates said size identifier;
decoding a syntax element indicating a reference quantization matrix, wherein said syntax element specifies a difference between an identifier of said reference quantization matrix and said obtained identifier for said quantization matrix;
obtaining said quantization matrix based on said reference quantization matrix;
de-quantizing transform coefficients for said block based on said quantization matrix; and
decoding said block based on said de-quantized transform coefficients.