Image Decoding Transform Skip and TSRC Flag Signaling
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to a significant increase in the amount of information to be transmitted and stored, resulting in higher transmission and storage costs.
Innovation Solution
An image decoding method and apparatus that improve image coding efficiency by obtaining and utilizing flags related to transform skip and transform skip residual coding (TSRC) to derive prediction and residual samples for a current block, and generating a reconstructed picture based on these samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality images are transmitted or stored, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transform processing parameters based on the block type and content characteristics. By changing the transform skip flag and TSRC flag parameters, the system adapts the transformation process to achieve better compression efficiency while maintaining image quality, thereby reducing the amount of information to be transmitted or stored.
2Measurement precision
If transform processing is applied to all blocks, then residual coding accuracy is improved, but coding complexity increases
Solution Approach 1:
The patent segments the coding process by dividing blocks into different types (intra-prediction blocks and inter-prediction blocks) and applying different transform processing strategies to each segment. For intra-prediction blocks, transform skip may be enabled, while for inter-prediction blocks, TSRC is applied. This segmentation allows the system to maintain residual coding accuracy for important blocks while reducing complexity for others.
Solution Approach 2:
The patent introduces dynamic flag mechanisms (transform skip flag and TSRC flag) that allow the transform processing to be adaptively adjusted based on block characteristics. These flags enable the system to dynamically decide whether to apply transform processing to each block, optimizing the balance between residual coding accuracy and coding complexity on a per-block basis.
3Productivity
If transform skip is enabled for intra-prediction blocks, then coding efficiency is improved, but residual information loss increases
Solution Approach 1:
The patent uses parameter changes by introducing the transform skip flag that can be set based on block characteristics. When this flag is enabled, the transform processing is skipped for intra-prediction blocks, improving coding efficiency by avoiding redundant transformations. The system compensates for potential information loss by adapting other coding parameters and using the flag to guide the decoding process.
Data Source
AI summary
An image decoding method performed by a decoding apparatus, according to the present document, comprises the steps of: acquiring a transform skip available flag; acquiring a TSRC available flag on the basis of the transform skip available flag; acquiring prediction-related information regarding a current block; deriving a prediction sample of the current block on the basis of the prediction-related information; acquiring residual information of a residual coding syntax for the current block, derived on the basis of the TSRC available flag; deriving a residual sample of the current block on the basis of the residual information; and generating a reconstructed picture on the basis of the prediction sample and the residual sample.