Image Decoding Sign Prediction for Complexity-Aware Coding
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality video/images, including immersive media, leads to higher transmission and storage costs due to increased data volume, necessitating improved video/image coding efficiency.
Innovation Solution
An image decoding method and device that adaptively derive the number of prediction signs for sign prediction, enhancing coding efficiency by reducing complexity and improving accuracy through separate signaling of syntax elements for different block types and slices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sign prediction is performed on all residual coefficients, then coding accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent applies different sign prediction strategies to different regions of the transform block. Specifically, it performs sign prediction on residual coefficients within a defined sign prediction area (typically the top-left region) while skipping coefficients outside this area. This local differentiation allows the system to focus computational resources on regions where sign prediction provides the most benefit, thereby improving coding accuracy in critical areas while limiting overall computational complexity.
2Measurement precision
If the number of prediction signs is increased, then sign prediction accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent performs sign prediction on only a subset of residual coefficients rather than all coefficients. By limiting sign prediction to a specific number of coefficients (numPredSigns) within the sign prediction area, the system achieves partial action that balances accuracy improvement with complexity control. This selective approach provides sufficient prediction accuracy for the most significant coefficients while avoiding the excessive complexity of processing all coefficients.
3Measurement precision
If high-resolution and high-quality video/images are transmitted, then image quality is improved, but transmission and storage costs increase
Solution Approach 1:
The patent modifies the sign prediction parameters (such as the sign prediction area size and the number of prediction signs) based on block characteristics and video content properties. By dynamically adjusting these parameters, the system optimizes the balance between compression efficiency and image quality, achieving high-quality reconstruction with reduced bitrates and lower transmission/storage costs.
Data Source
AI summary
An image decoding method performed by a decoding device according to the present disclosure comprises the steps of: deriving a predicted number of signs of a current block; performing sign prediction of the current block to derive as many signs of residual coefficients as the predicted number of signs; deriving residual samples of the current block on the basis of the signs; and generating a reconstructed picture on the basis of the residual samples.