Inter Prediction Control for Non-Dyadic Video Blocks
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Solution Overview
Problem
Existing video coding technologies face inefficiencies in handling non-dyadic blocks, leading to suboptimal performance in inter prediction processes.
Innovation Solution
Implementing a method to determine and enable or disable inter prediction tools based on whether a block is dyadic or non-dyadic, and applying specific coding techniques such as sub-block splitting, decoder-side motion refinement, and affine prediction for non-dyadic blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inter prediction tools are applied to non-dyadic blocks, then prediction accuracy improves, but coding complexity increases
Solution Approach 1:
The patent applies different inter prediction tools selectively based on block type. Dyadic blocks receive full inter prediction tools (bi-directional inter prediction, affine prediction, DMVR), while non-dyadic blocks receive a simplified subset (unidirectional inter prediction, no affine prediction). This local differentiation optimizes prediction accuracy where needed while reducing complexity where it would be redundant.
Solution Approach 2:
The patent segments the video picture into dyadic and non-dyadic blocks based on block dimension characteristics. This segmentation allows the encoder to apply different coding strategies to different segments, enabling optimized prediction for dyadic blocks while simplifying processing for non-dyadic blocks.
2Productivity
If all inter prediction tools are enabled for all blocks, then compression performance improves, but processing time increases
Solution Approach 1:
Instead of applying all inter prediction tools universally (excessive action), the patent applies only the necessary tools to each block type (partial action). Non-dyadic blocks receive only unidirectional inter prediction without affine prediction or DMVR, which reduces processing time while maintaining adequate compression performance for these blocks.
Solution Approach 2:
The patent changes the set of enabled inter prediction tools as a parameter based on block characteristics. The configuration of available prediction tools is dynamically adjusted according to whether a block is dyadic or non-dyadic, optimizing the balance between compression performance and processing time for each block type.
3Device complexity
If inter prediction is simplified for non-dyadic blocks, then processing complexity reduces, but prediction accuracy deteriorates
Solution Approach 1:
The patent accepts that prediction accuracy will be lower for non-dyadic blocks and designs the coding system accordingly. By localizing full prediction tools only to dyadic blocks, the system maintains high accuracy where block geometry supports it while accepting reduced accuracy for non-dyadic blocks in exchange for significant complexity reduction.
Data Source
AI summary
A mechanism for processing video data implemented by a video coding apparatus is disclosed. The mechanism determines whether a block is dyadic or non-dyadic. The mechanism also enables a coding tool associated with inter prediction when the block is determined to be dyadic. The mechanism also disables the coding tool when the block is determined to be non-dyadic. A conversion between a visual media data and a bitstream is performed by applying inter prediction to the block.