Image Decoding With CU Chroma QP Offset Signaling
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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 increased data volume, necessitating a more efficient image compression technique.
Innovation Solution
An image decoding method that derives and signals Coding Unit (CU) chroma Quantization Parameter (QP) offset information in a transform unit syntax, allowing for efficient derivation of transform coefficients and residual samples, even when the first transform block has no non-zero coefficients, thereby reducing decoding apparatus costs and buffer requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CU chroma QP offset related information is signaled in transform unit syntax for the first transform block, then image coding efficiency is improved and decoding apparatus costs are reduced, but the complexity of the syntax structure increases
Solution Approach 1:
The patent merges the signaling of CU chroma QP offset related information with the existing transform unit syntax structure. By integrating this information into the transform unit syntax for the first transform block, the patent combines multiple functions into a unified structure, thereby improving coding efficiency without proportionally increasing complexity.
Solution Approach 2:
The transform unit syntax structure is designed to serve multiple purposes: it signals transform coefficients, and simultaneously carries CU chroma QP offset related information. This multi-functionality allows the same syntax structure to achieve both transformation and quantization parameter control, improving overall coding efficiency.
2Quantity of substance
If CU chroma QP offset related information is signaled in transform unit syntax, then buffer requirements are reduced, but the complexity of information processing increases
Solution Approach 1:
The patent performs preliminary action by signaling CU chroma QP offset related information in the transform unit syntax before the information is needed for decoding. This allows the decoder to have the QP offset information readily available when processing transform blocks, eliminating the need for additional buffering while maintaining efficient information access.
Solution Approach 2:
The transform unit syntax acts as an intermediary carrier that efficiently transmits CU chroma QP offset related information from the encoder to the decoder. This intermediary structure consolidates information transmission, reducing buffer requirements while managing processing complexity through structured data organization.
3Manufacturing precision
If transform coefficients are derived based on residual information and CU chroma QP offset, then image reconstruction quality is maintained, but the number of processing steps increases
Solution Approach 1:
The patent maintains continuity of useful action by integrating the QP offset signaling within the existing transform and quantization flow. The CU chroma QP offset related information is used continuously throughout the processing of transform blocks, ensuring that image reconstruction quality is maintained without requiring separate discrete processing steps for QP application.
Data Source
AI summary
An image decoding method performed by a decoding apparatus, according to the present document, comprises the steps of obtaining residual information for a current chroma block; obtaining CU chroma QP offset-related information for the current chroma block on the basis of the size and tree type of the current chroma block; deriving transform coefficients for the current chroma block on the basis of the residual information; deriving chroma QP for the current chroma block on the basis of the CU chroma QP offset-related information; deriving residual samples for the current chroma block by dequantizing the transform coefficients on the basis of the chroma QP; and generating a reconstructed picture on the basis of the residual samples.