Transform Skip Residual Decoding With Sign Data Hiding Control

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Solution Overview

Problem

The increasing demand for high-resolution and high-quality images leads to higher transmission and storage costs due to the increased amount of information, necessitating a more efficient image compression technique.

Innovation Solution

The method and apparatus improve image coding efficiency by signaling the Transform Skip Residual Coding (TSRC) enabled flag based on the sign data hiding enabled flag, preventing sign data hiding for transform skip blocks where TSRC is not enabled, thereby reducing the bit amount coded.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If high-resolution and high-quality images are transmitted or stored, then image quality is improved, but transmission cost and storage cost increase

Engineering Contradiction:

Improveimage qualityVSAvoidtransmission cost and storage cost

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the TSRC enabled flag based on the sign data hiding enabled flag state. When sign data hiding is disabled, TSRC is also disabled, optimizing the residual coding parameters to achieve better compression efficiency while maintaining image quality, thereby reducing transmission and storage costs

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If sign data hiding is applied to transform skip blocks, then residual coding flexibility is improved, but bit amount increases

Engineering Contradiction:

Improveresidual coding flexibilityVSAvoidbit amount

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent applies local quality by making the TSRC enabled flag dependent on the sign data hiding enabled flag at the block level. This allows different residual coding strategies to be applied locally to different blocks based on their specific characteristics, optimizing the balance between coding flexibility and bit rate efficiency

Inventive Principle:

Principle #3Local quality

3Productivity

If TSRC is enabled independently of sign data hiding flag, then residual coding efficiency is improved, but device complexity increases

Engineering Contradiction:

Improveresidual coding efficiencyVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent merges the TSRC enabled flag signaling with the sign data hiding enabled flag by making TSRC dependent on the latter. This combines two control mechanisms into a unified approach, reducing the number of independent flags that need to be processed and stored, thereby reducing device complexity while maintaining residual coding efficiency

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20260039877A1Method and apparatus for decoding imaging related to sign data hiding

Publication Date: 2026.02.05 LG ELECTRONICS INC

AI summary

An image decoding method performed by a decoding apparatus according to the present document comprises the steps of: obtaining a sign data hiding availability flag indicating whether or not sign data hiding is available for a current slice; obtaining a TSRC availability flag indicating whether or not TSRC is available for a transform skip block of the current slice; obtaining residual coding information about the transform skip block on the basis of the TSRC availability flag; deriving a residual sample for the transform skip block on the basis of the residual coding information; and generating a reconstruction picture on the basis of the residual sample, wherein the TSRC availability flag is obtained on the basis of the sign data hiding availability flag.