Subblock Template Matching for Motion Vector Prediction Overhead
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Solution Overview
Problem
Existing video coding technologies face inefficiencies in predicting motion vectors at a subblock level, leading to increased transmission overhead and reduced coding efficiency.
Innovation Solution
The proposed method involves subblock-based template-matching for motion vector prediction (SbTMVP), where motion vectors for subblocks are derived based on a center position motion vector and adjacent subblock motion vectors, enhancing prediction accuracy and reducing transmission overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion vectors are predicted at block level using traditional methods, then device complexity is reduced, but measurement precision of motion vectors deteriorates
Solution Approach 1:
The current block is divided into multiple subblocks, and motion vector prediction is performed separately for each subblock using template matching. This segmentation allows for more precise motion representation at the subblock level while maintaining manageable complexity through systematic processing of each segment.
Solution Approach 2:
Different motion characteristics are applied to different subblocks within the same block. Each subblock can have its own motion vector derived from local template matching, allowing the prediction accuracy to adapt to local motion variations rather than using a single block-level motion vector.
2Measurement precision
If subblock-based motion vector prediction is implemented, then measurement precision of motion vectors is improved, but transmission overhead increases
Solution Approach 1:
Template matching is performed preliminarily to derive motion vectors for subblocks before actual encoding. By pre-calculating these motion vectors and using them for prediction, the method reduces the need to transmit detailed motion information for each subblock, thereby reducing transmission overhead while maintaining high prediction accuracy.
Solution Approach 2:
Instead of transmitting original motion vector data for each subblock, the method uses copied motion information from template matching results. The template region serves as a reference copy that enables derivation of subblock motion vectors without transmitting redundant information, thus reducing transmission overhead.
3Productivity
If traditional block-level motion compensation is used, then device complexity is reduced, but coding efficiency deteriorates
Solution Approach 1:
The method introduces dynamic motion vector derivation at the subblock level through template matching, allowing the motion compensation process to adapt to local motion characteristics. This dynamic approach improves coding efficiency by better representing motion variations within blocks, despite increased processing complexity.
Solution Approach 2:
The patent extends motion vector prediction from the traditional block dimension to the subblock dimension. By operating at a finer granularity (subblock level rather than block level), the method achieves better coding efficiency through more precise motion representation, while managing complexity through systematic dimensional decomposition.
Data Source
AI summary
A video bitstream is received. The video bitstream includes a current block comprising a plurality of subblocks and a template region of the current block comprising a plurality of template subblocks adjacent to at least one of a top side and a left side of the current block. A motion vector (MV) located in a center position of the current block is determined. The MV is determined based on at least one MV of the plurality of subblocks of the current block. A MV for each of the plurality of template subblocks is determined based on the MV located in the center position of the current block and a respective MV of a corresponding subblock of the plurality of subblocks that is adjacent to the respective template subblock. The current block is reconstructed based on the determined MVs for the plurality of template subblocks.