Video Chroma Transform-Skip Signaling for Reduced Bitstream Overhead

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Solution Overview

Problem

The increasing demand for high-resolution and high-quality images leads to higher data volumes, resulting in increased transmission and storage costs, necessitating improved video encoding/decoding techniques for enhanced compression efficiency.

Innovation Solution

The implementation of a transform skip mode in image encoding/decoding methods and apparatuses, utilizing chroma residual joint flags and transform skip mode flags to optimize compression by determining the application of transform skip modes to chroma components based on luma and first chroma components, thereby reducing redundant data transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If high resolution and quality images are used, then image quality is improved, but data volume increases leading to higher transmission and storage costs

Engineering Contradiction:

Improveimage qualityVSAvoiddata volume

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The image data is segmented into luma and chroma components, allowing independent processing and optimization of each component's compression strategy

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent merges the transform skip mode decision for chroma components with the luma component processing, using joint flags to indicate transform skip application across multiple components, reducing redundant signaling

Inventive Principle:

Principle #5Merging (Combining)

2Device complexity

If transform skip mode is applied to reduce compression overhead, then signaling efficiency is improved, but flexibility in chroma component processing is reduced

Engineering Contradiction:

Improvesignaling overheadVSAvoidchroma component processing flexibility

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The transform skip mode flag system is designed to universally apply to multiple chroma components (Cb and Cr) through joint signaling, allowing a single flag or coordinated flag pair to control transform skip behavior across different chroma components

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent introduces dynamic decision-making for chroma transform skip mode based on luma component characteristics and chroma residual joint mode status, allowing the system to adaptively adjust processing flexibility according to content requirements

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250343915A1Image encoding/decoding method and apparatus, and recording medium storing bitstream

Publication Date: 2025.11.06 ELECTRONICS & TELECOMM RES INST

AI summary

Disclosed herein is a video decoding method. The video decoding method includes: obtaining a chroma residual joint flag of a current block indicating whether or not a chroma residual joint mode is applied to the current block; obtaining, from a bitstream, a transform skip mode flag for a luma component of the current block and a transform skip mode flag for a first chroma component; when the chroma residual joint flag indicates that a chroma residual joint mode is applied to the current block, determining whether or not a transform skip mode is applied to a second chroma component of the current block, according to the transform skip mode flag for the first chroma component; and, when the chroma residual joint flag indicates that a chroma residual joint mode is not applied to the current block, obtaining, from the bitstream, a transform skip mode flag for the second chroma component of the current block.