Adaptive Merge Candidate Selection for Video Coding Blocks
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Solution Overview
Problem
Conventional video coding techniques in merge mode often rely on fixed candidate positions, which can lead to suboptimal performance due to varying block sizes and shapes, resulting in reduced rate-distortion efficiency.
Innovation Solution
An adaptive candidate position approach is implemented, where the number and location of merge candidates are determined based on the size and shape of the prediction block, allowing for more flexible and effective selection of motion data candidates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed candidate positions are used for merge mode, then device complexity is reduced, but rate-distortion efficiency deteriorates due to inability to adapt to varying block sizes and shapes
Solution Approach 1:
The patent implements dynamic candidate position determination where the number and positions of merge candidates are adapted based on the prediction block size. Specifically, when the block size is 64×64, five merge candidates are selected from each side; when the block size is smaller (e.g., 4×4 to 32×32), four merge candidates are selected from each side. This dynamic adjustment allows the system to optimize rate-distortion efficiency for different block sizes while maintaining manageable complexity through predefined selection rules.
2Productivity
If more merge candidates are selected to improve rate-distortion performance, then coding efficiency improves, but transmission overhead increases
Solution Approach 1:
The patent changes the parameter of candidate selection based on block size characteristics. By adjusting the number of merge candidates (5 for 64×64 blocks, 4 for smaller blocks) and their positions according to the prediction block dimensions, the system optimizes the balance between coding efficiency and transmission overhead. This parameter adaptation ensures that more candidates are provided when needed for larger blocks while reducing overhead for smaller blocks where fewer candidates suffice.
Data Source
AI summary
Aspects of the disclosure provide a method for video coding in merge mode or skip mode. The method can include receiving a prediction block (PB) of a picture, determining number and positions of merge candidates of the PB according to a size and/or a shape of the PB, and constructing a candidate list including motion data of a subset of the merge candidate positions.