Partial-Block Intra Prediction for Video Compression Efficiency
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Solution Overview
Problem
The increasing demand for multimedia data, such as video, exceeds the bandwidth capabilities of existing channels, necessitating improved compression efficiency in image encoding and decoding processes.
Innovation Solution
The method involves dividing encoding/decoding blocks into partial blocks based on symmetrical or asymmetrical shapes and determining intra prediction modes using multiple intra prediction modes, with the option to vary the number of available modes based on block size and neighboring block frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple intra prediction modes are used for encoding/decoding, then compression efficiency is improved, but device complexity increases
Solution Approach 1:
The current block is divided into multiple partial blocks (e.g., two or four partial blocks) and different intra prediction modes are applied to different partial blocks. This segmentation allows the system to use multiple prediction modes effectively while managing complexity by applying modes selectively to specific regions rather than uniformly across the entire block.
Solution Approach 2:
Different intra prediction modes are applied to different partial blocks based on local characteristics of each region. This local quality approach ensures that each partial block uses the most appropriate prediction mode for its specific content, improving overall compression efficiency while allowing the decoder to manage complexity by processing each partial block independently with its designated mode.
2Productivity
If the number of intra prediction modes is increased, then compression efficiency is improved, but encoding/decoding time increases
Solution Approach 1:
Instead of applying multiple intra prediction modes to the entire block, the method applies different modes to only specific partial blocks. This partial action approach achieves the benefit of multiple modes where needed while avoiding the time penalty of processing the entire block with multiple modes, thus improving compression efficiency without proportionally increasing encoding/decoding time.
3Productivity
If blocks are divided into partial blocks with different prediction modes, then compression efficiency is improved, but information processing complexity increases
Solution Approach 1:
The division of the current block into partial blocks and the assignment of different intra prediction modes to each partial block are determined and signaled in advance during the encoding process. This preliminary action allows the decoder to reconstruct the block structure and apply the appropriate prediction modes without requiring complex real-time analysis, thus improving compression efficiency while managing information processing complexity through pre-planned block division and mode assignment.
Data Source
AI summary
According to the present invention, a method of decoding a video signal may include decoding division information that indicates whether a current decoding block is divided into two partial blocks, decoding information that indicates a division direction for the current decoding block when the division information indicates that the current decoding block is divided into the two partial blocks, and dividing the current decoding block into the two partial blocks according to the division direction.