Image Decoding With Selective TSRC Flag Signaling
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images results in 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 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 and enhancing overall residual coding efficiency.
Engineering Contradictions & Design Principles
Engineering 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
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the precision of residual data representation through transform skip mode and sign data hiding techniques. Instead of uniformly encoding all residual data at high precision, the system selectively reduces precision for specific blocks where it is acceptable, thereby reducing the total amount of information while maintaining overall image quality.
2Measurement precision
If the amount of information in image data is increased, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent implements local quality by applying different encoding strategies to different blocks within the image. Specifically, transform skip mode is applied selectively to certain blocks, and sign data hiding is used for specific residual coefficients, allowing high precision where needed and lower precision where acceptable, thus optimizing transmission efficiency while maintaining quality.
3Adaptability or versatility
If TSRC enabled flag is always signaled, then coding flexibility is improved, but bit amount increases
Solution Approach 1:
The patent applies partial action by signaling the TSRC enabled flag only under specific conditions rather than always. The flag is signaled selectively based on whether the current block is a transform skip block and other contextual factors, reducing the average bit amount while maintaining coding flexibility when needed.
4Productivity
If sign data hiding is used for all blocks, then residual coding efficiency is improved, but coding accuracy deteriorates for blocks where TSRC is not enabled
Solution Approach 1:
The patent implements local quality by applying sign data hiding selectively only to blocks where TSRC is enabled. The decoding apparatus checks the TSRC enabled flag and the block type to determine whether sign data hiding should be applied, ensuring coding accuracy is maintained for blocks where it is not appropriate while still achieving efficiency gains where it is beneficial.
Data Source
AI summary
An image decoding method performed by a decoding apparatus according to the present document is characterized by comprising the steps of: acquiring image information; and generating a reconstructed picture on the basis of the image information.