High-level constraint flag for local chroma quantization parameter control

US12250378B2 · kind B2 · utility

Assignee

• InterDigital Patent Holdings, Inc. · FR

Inventors

• Philippe De Lagrange · Cesson-Sévigné, FR
• Karam Naser · La Jardière, FR
• Philippe Bordes · Olivet, FR
• Fabrice Leleannec · La Jardière, FR

Key dates

• Filing date: Mar 8, 2021
• Grant date: Mar 11, 2025
• Expiry date: Sep 4, 2041

Classification

• Technology area (CPC —): General

Abstract

A method and apparatus to improve compression efficiency in a video compression scheme enables separate control of a local chroma quantization parameter. The control can be used to disable a local chroma quantization parameter. One embodiment uses an existing local luma quantization parameter control flag for controlling local chroma quantization parameter. Another embodiment includes a separate local chroma quantization parameter control flag. Bitstream syntax is used to convey the flags.