Single-index quantization matrix design for video encoding and decoding

US12170771B2 · kind B2 · utility

Assignee

• InterDigital Patent Holdings, Inc. · FR

Inventors

• Philippe De Lagrange · Cesson-Sévigné, FR
• Fabrice Leleannec · La Jardière, FR
• Karam Naser · La Jardière, FR
• Edouard Francois · Bruz, FR
• Pierre Andrivon · Liffré, FR
• Ya Chen · Rennes, FR

Key dates

• Filing date: Jun 16, 2020
• Grant date: Dec 17, 2024
• Expiry date: Jul 26, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N19/119
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Different quantization matrices may be transmitted corresponding to different block sizes, color components and prediction modes. To more efficiently signal the coefficients of the quantization matrices, in one implementation, a unified matrix identifier matrixId is used, based on a size identifier (sizeId) that relates to CU size with larger sizes listed first, and a matrix type (matrixTypeId) with luma QMs listed first. For example, the unified identifier is derived as: matrixId=N*sizeId+matrixTypeId, where N is the number of possible type identifiers, e.g., N=6. This single identifier allows referring to any previously transmitted matrix when using prediction (copy), and transmitting larger matrices first avoids interpolation in the prediction process. When a block uses the Intra Block Copy prediction mode, QM identifier may be derived as if the block uses the INTER prediction mode.