Decoder-Side Intra Mode Derivation for Video Coding Efficiency
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Solution Overview
Problem
Current video coding technologies face inefficiencies in intra prediction, particularly in determining optimal intra modes for video blocks, which affects compression ratios and decoding accuracy.
Innovation Solution
The method involves using decoder-side intra mode derivation (DIMD) and template-based intra mode derivation (TIMD) to determine candidate intra modes based on neighboring samples, combining these modes to reconstruct video blocks with improved prediction accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional intra coding without intra prediction is used, then the decoding process is simpler, but the compression ratio and coding efficiency deteriorate
Solution Approach 1:
The decoder derives intra modes autonomously using template matching and candidate mode evaluation without requiring explicit mode signaling from the encoder. The system serves itself by generating prediction modes locally based on neighboring block patterns, eliminating the need for complex mode communication while maintaining high coding efficiency
Solution Approach 2:
The patent changes the parameter representation by deriving intra modes from template matching results rather than directly signaling them. The intra mode value is transformed from a transmitted parameter to a derived parameter based on template similarity metrics, reducing signaling overhead while preserving prediction accuracy
2Measurement precision
If multiple candidate intra modes are derived and evaluated, then the prediction accuracy improves, but the computational complexity increases
Solution Approach 1:
Instead of evaluating all possible intra modes, the patent derives and evaluates only a limited set of candidate modes based on template matching results. This partial action approach focuses computational resources on the most promising candidates, achieving high prediction accuracy with reduced complexity by avoiding exhaustive mode evaluation
Solution Approach 2:
The patent performs preliminary template matching and candidate mode identification before final intra mode selection. By pre-processing to identify promising candidate modes based on template similarity, the system reduces the search space for optimal intra modes, thereby lowering computational complexity while maintaining accuracy
3Reliability
If intra mode is signaled explicitly in the bitstream, then the decoder can accurately reconstruct the mode, but the bitstream size increases
Solution Approach 1:
The patent extracts the intra mode information from the explicit bitstream signaling and replaces it with implicit derivation at the decoder side. By taking out the mode signaling from the bitstream and performing template-based derivation, the system eliminates redundant data transmission while ensuring accurate mode reconstruction through deterministic decoder-side computation
Data Source
AI summary
Flag information associated with the current block is obtained in coded information, which indicates whether the current block is intra predicted based at least in part on an intra mode derivation. In response to the flag information being true, a plurality of candidate intra modes is determined based on neighboring samples of the current block. A first intra mode of the current block is determined based on a first syntax element that is included in the coded information. The first syntax element indicates the first intra mode of the current block from a most probable mode (MPM) list and a MPM remainder. A second intra mode of the current block is determined based on the first intra mode and the plurality of candidate intra modes. The current block is reconstructed based on the first intra mode and the second intra mode.