Intra Prediction Candidate Lists With Adaptive Angular Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing intra prediction mode candidate lists in video encoding and decoding are not accurate enough, leading to reduced encoding and decoding efficiency.
Innovation Solution
Determine a first angular accuracy for the intra prediction mode candidate list and construct it based on this accuracy to improve the search range of angular prediction modes, enhancing the prediction accuracy for current blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the intra prediction mode candidate list is constructed using existing methods, then the encoding and decoding process can be completed, but the prediction accuracy is insufficient due to inadequate search range of angular prediction modes
Solution Approach 1:
The patent changes the angular accuracy parameter from traditional values (e.g., 65-angular-accuracy) to higher accuracy values (e.g., 129-angular-accuracy, 257-angular-accuracy). This parameter change expands the search range of angular prediction modes in the candidate list, enabling more precise prediction while maintaining a systematic approach to construction that manages complexity.
2Reliability
If multiple prediction modes are selected from the intra prediction mode candidate list to improve prediction effect, then the prediction quality increases, but the encoding and decoding efficiency decreases due to insufficient accuracy of the candidate list
Solution Approach 1:
The patent performs preliminary action by constructing an accurate intra prediction mode candidate list before the actual prediction process. By pre-establishing a comprehensive candidate list with expanded angular accuracy, the system ensures that when multiple prediction modes are selected, they are drawn from a more accurate pool, thereby improving prediction effect without proportionally increasing encoding and decoding complexity.
3Measurement precision
If the search range of angular prediction modes is expanded to improve prediction accuracy, then the intra prediction mode candidate list becomes more accurate, but the computational complexity increases
Solution Approach 1:
The patent segments the angular prediction mode search space into structured candidate lists with different angular accuracy levels (e.g., 65-angular-accuracy, 129-angular-accuracy, 257-angular-accuracy). This segmentation allows the system to systematically expand the search range by selecting appropriate accuracy levels rather than uniformly increasing complexity across all prediction modes, thereby managing computational load while improving accuracy where needed.
Data Source
AI summary
A video encoding method, a video decoding method and apparatus, and a storage medium are provided. The decoding method includes that: angular accuracy corresponding to the intra prediction mode candidate list is determined, the first angular accuracy is used for indicating a search range of an angular prediction mode in the intra-frame prediction mode candidate list; the intra prediction mode candidate list is constructed on the basis of the first angular accuracy; and the prediction for the current block is performed on the basis of the constructed intra prediction mode candidate list.