Intra Prediction MPM Configuration for Multiple Reference Lines
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Solution Overview
Problem
Existing video signal processing methods lack efficiency in coding, particularly in the use of transform blocks for video compression.
Innovation Solution
A method and device for video signal processing that utilizes intra prediction techniques, including determining reference sample line indices and planar modes, generating MPM lists based on angular modes, and predicting blocks using selected intra prediction modes to improve coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple reference lines are used for intra prediction, then prediction accuracy is improved, but signaling complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining Most Probable Mode (MPM) lists based on neighboring block modes before the actual prediction process. The encoder and decoder both pre-establish these MPM lists using modes from left and upper neighboring blocks, allowing the current block to select from pre-computed probable modes rather than signaling all possible modes, thus reducing signaling complexity while maintaining prediction accuracy
Solution Approach 2:
The patent applies local quality by differentiating the prediction process based on the reference line index. When reference line index is 0, both planar mode and MPM are considered; when reference line index is not 0, only MPM is used. This localized approach optimizes the prediction process for different reference line scenarios, improving accuracy where needed while reducing complexity in other cases
2Adaptability or versatility
If planar mode information is always signaled, then prediction flexibility is improved, but bitstream overhead increases
Solution Approach 1:
The patent applies partial action by conditionally signaling planar mode information only when necessary. The planar mode flag is signaled only when the reference line index is 0 and MPM mode is not used, or when specific neighboring block conditions are met. This partial signaling approach maintains prediction flexibility when needed while reducing bitstream overhead by avoiding redundant signaling in other cases
3Productivity
If MPM lists are generated for all blocks, then coding efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-generating MPM lists based on neighboring block modes before processing the current block. Both encoder and decoder independently construct MPM lists using modes from left and upper neighboring blocks, enabling efficient selection without complex real-time computation during the prediction process itself
Solution Approach 2:
The patent applies dynamics by making the MPM list generation adaptive to neighboring block configurations. The composition of MPM lists varies dynamically based on the intra prediction modes of neighboring blocks, allowing the system to optimize for local characteristics while maintaining a standardized processing framework
Data Source
AI summary
A video signal processing device comprises a processor configured to: obtain an index of intra prediction mode of a current block, obtain a reference sample line index for the current block, and generate a plurality of reference samples and a plurality of additional reference samples based on a direction of the intra prediction mode. The direction of the intra prediction mode is determined based on the index, and a number of the plurality of additional reference samples determined based on the reference sample line index and/or a ratio of a width of the current block and a height of the current block.