Selective Subblock Split Signaling for Video Coding Overhead Reduction
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Solution Overview
Problem
Existing video encoding techniques face challenges in efficiently encoding and decoding subblock partitioning information, leading to increased overhead and reduced coding efficiency, especially for large blocks or horizontally long rectangular blocks.
Innovation Solution
A method and apparatus for selectively encoding and decoding the splitting direction of subblocks, which generates a pre-prunable range based on the size of the current block and the number of partitioned subblocks, allowing for efficient intra prediction by determining whether the intra prediction mode is included in the vertical or horizontal pre-prunable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If subblock partitioning is applied to improve intra prediction efficiency for large blocks, then prediction accuracy is improved, but signaling overhead increases
Solution Approach 1:
The current block is divided into multiple subblocks, and intra prediction is performed separately for each subblock. This segmentation allows the patent to improve prediction accuracy by using reference pixels from adjacent subblocks while managing the complexity through structured partitioning
Solution Approach 2:
The patent applies subblock partitioning selectively based on block size and prediction mode. For certain prediction modes and block configurations, the partitioning is applied only when beneficial, avoiding unnecessary overhead while maintaining prediction accuracy where needed
2Loss of information
If block size is increased to reduce overhead, then signaling overhead is reduced, but prediction accuracy deteriorates due to larger distance between pixels and reference pixels
Solution Approach 1:
Large blocks are segmented into smaller subblocks that can independently perform intra prediction. This allows each subblock to use reference pixels from its adjacent neighbors, maintaining prediction accuracy while the overall block structure reduces overhead compared to encoding each small block separately
Solution Approach 2:
Different parts of the block (subblocks) are treated differently with local intra prediction. Each subblock uses its own prediction mode and reference pixels, allowing local optimization of prediction quality while maintaining overall efficiency
Data Source
AI summary
A video encoding/decoding method and an apparatus use selective transmission of subblock partitioning information. The video encoding/decoding method and apparatus selectively encode and decode the splitting direction of a subblock to reduce the overhead of signal transmission for using subblock partitioning while effectively performing intra prediction per subblock basis.