Video Encoding Block Partitioning with Aspect-Ratio-Based Merge Mode
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Solution Overview
Problem
Existing video coding technologies face challenges in improving coding efficiency, enhancing image quality, reducing processing amounts, and optimizing circuit scale, particularly in handling block partitions defined by distances and angles that may be inappropriate for certain aspect ratios.
Innovation Solution
An encoder and decoder system that determines a mode for block partitions based on width and height, storing or obtaining an index indicating distance and angle only when the aspect ratio is not excessively high, thereby disabling such definitions for ratios greater than 8:1, reducing unnecessary processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If block partitioning by distance and angle is applied to all aspect ratios, then coding flexibility is improved, but processing efficiency deteriorates for extreme aspect ratios
Solution Approach 1:
The patent changes the parameter of aspect ratio threshold (8:1) to determine whether to apply distance-angle based block partitioning. For blocks with aspect ratio >= 8:1, the system uses alternative partitioning methods (horizontal/vertical splits) instead of distance-angle based methods, thereby avoiding unnecessary processing while maintaining coding flexibility for appropriate cases
Solution Approach 2:
The patent dynamically adapts the block partitioning method based on the aspect ratio of each block. The system switches between distance-angle based partitioning (for moderate aspect ratios) and horizontal/vertical splitting (for extreme aspect ratios), making the processing adaptive to the specific characteristics of each block rather than applying a fixed method universally
2Manufacturing precision
If distance and angle indices are stored in bitstream for all blocks, then partition precision is improved, but bitstream complexity increases
Solution Approach 1:
The patent extracts and removes the distance and angle index storage from the bitstream for blocks with extreme aspect ratios (>= 8:1). By taking out this unnecessary information, the system reduces bitstream complexity while maintaining sufficient partition precision through alternative horizontal/vertical splitting methods that do not require storing distance and angle parameters
3Productivity
If merge mode with distance angle is applied to all blocks, then coding efficiency is improved, but processing amount increases
Solution Approach 1:
The patent applies distance-angle based merge mode only partially to blocks with aspect ratio < 8:1, rather than excessively applying it to all blocks including those with extreme aspect ratios. This partial application maintains coding efficiency for appropriate cases while avoiding the excessive processing overhead that would result from universally applying the same method
Data Source
AI summary
An encoder determines, based on a width and a height of a block, whether or not to disable a prediction mode in which the block is split along a partitioning line defined by a distance and an angle and then prediction is performed; and encodes the block with the prediction mode disabled or not disabled according to a result of the determination on whether or not to disable the prediction mode. Here, the distance is the shortest distance between the center of the block and the partitioning line, and the angle is an angle representing a direction from the center of the block toward the partitioning line in the shortest distance. The encoder determines to disable the prediction mode when (i) a width-to-height ratio is at least 8 or (ii) a height-to-width ratio is at least 8.