Video Decoding With Implicit SBT Mode Derivation

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Solution Overview

Problem

The introduction of sub-block transform (SBT) modes in video coding frameworks increases the cost of coding flag bits, affecting coding and decoding efficiency.

Innovation Solution

Implicitly determine the SBT mode for a current block based on target quantization coefficients in a target region, eliminating the need for explicit coding of flag bits on the coder side.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If sub-block transform (SBT) modes are introduced to reduce residual coding cost, then coding efficiency is improved, but the cost of coding flag bits increases

Engineering Contradiction:

Improvecoding efficiencyVSAvoidflag bit cost

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent applies the self-service principle by enabling the decoder to autonomously determine the SBT mode through analysis of quantization coefficient characteristics and gradient information. The decoder independently performs gradient calculations and mode selection without requiring explicit flag bit transmission from the encoder, making the system self-sufficient and eliminating the flag bit overhead while maintaining coding efficiency improvements

Inventive Principle:

Principle #25Self-service

2Manufacturing precision

If SBT modes are used to improve reconstruction quality, then image quality is enhanced, but additional flag bits are required for mode indication

Engineering Contradiction:

Improvereconstruction qualityVSAvoidflag bit overhead

Core Design Contradiction:

Manufacturing precisionVSLoss of information

Solution Approach 1:

The patent replaces the mechanical system of explicit flag bit transmission with an information-theoretic approach where the SBT mode is implicitly encoded in the quantization coefficients themselves. The decoder substitutes the need for separate mode indication by deriving mode information from the gradient characteristics of quantized coefficients, eliminating information loss associated with flag bit overhead while preserving reconstruction quality

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If explicit flag bit coding is used for SBT modes, then mode information is accurately transmitted, but bit rate increases

Engineering Contradiction:

Improvemode information accuracyVSAvoidbit rate

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent applies the copying principle by embedding mode information within the existing quantization coefficient data structure rather than creating separate flag bit copies. The gradient information derived from quantization coefficients serves as a implicit copy of the mode selection information, maintaining accurate mode transmission while avoiding the bit rate penalty of explicit flag bit coding

Inventive Principle:

Principle #26Copying

Data Source

PatentUS20260032267A1Video encoding and decoding

Publication Date: 2026.01.29 TENCENT TECHNOLOGY (SHENZHEN) CO LTD

AI summary

Some aspects of the disclosure provide a method of video decoding. In some examples, values of one or more target quantization coefficients in a target region of quantization coefficients of a current block are obtained. A sub-block transform (SBT) mode of the current block is derived based on the values of the one or more target quantization coefficients in the target region. The current block is reconstructed based on the SBT mode of the current block. Apparatus and non-transitory computer-readable storage medium counterpart embodiments are also contemplated.