Intra Merge Prediction Mode for Video Coding Efficiency
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Solution Overview
Problem
High-Efficiency Video Coding (HEVC) faces challenges in achieving optimal coding efficiency due to limitations in prediction modes, particularly in areas with complex textures, where pure intra or inter prediction modes fail to provide accurate predictions, leading to increased signaling overhead and reduced coding gains.
Innovation Solution
The introduction of Intra Merge Prediction (IMP) mode, which combines intra-prediction and merge modes by using a simple average or weighted sum of predictions from selected intra-prediction and merge modes, allowing for a combined prediction that reduces signaling overhead and improves coding efficiency in complex texture areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If pure intra prediction mode is used, then signaling overhead is reduced, but prediction accuracy deteriorates in areas with complex textures
Solution Approach 1:
The patent combines intra prediction and merge modes into a unified Intra Merge Prediction mode. The predictor is generated by averaging the intra prediction result and the merge mode result, allowing the system to leverage both spatial and temporal information while maintaining compact signaling through merge-indexed prediction.
2Measurement precision
If pure inter prediction mode is used, then prediction accuracy is improved for temporal correlation, but signaling overhead increases and coding gain is reduced in complex texture areas
Solution Approach 1:
The patent merges intra prediction and inter prediction (merge mode) into a single hybrid mode. By using the average of both prediction types, it captures both spatial and temporal correlations while keeping signaling overhead low through the use of merge index selection.
Solution Approach 2:
The Intra Merge Prediction mode serves multiple functions: it can operate as pure intra prediction when beneficial, pure inter prediction when appropriate, or a combination of both. This multi-functionality allows adaptive optimization for different content types without requiring separate coding paths.
3Measurement precision
If combined prediction mode (IMP mode) is used, then prediction accuracy is improved in complex texture areas, but device complexity increases
Solution Approach 1:
The patent applies a simple averaging operation to combine intra and inter predictions rather than using complex optimization algorithms. This partial action approach provides sufficient improvement for complex textures while keeping the computational complexity manageable.
Data Source
AI summary
A combined prediction mode for encoding or decoding a pixel block of a video picture is provided. When it is determined that the combined prediction mode is used, a video codec generates an intra predictor for the current block based on a selected intra-prediction mode and a merge-indexed predictor for the current block based on a selected merge candidate from a merge candidates list. The video codec then generates a final predictor for the current block based on the intra predictor and the merge-indexed predictor. The final predictor is then used to encode or decode the current block.