Joint Motion Vector Difference Coding for Video Compression
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Solution Overview
Problem
Current video compression techniques are inefficient in processing next-generation video contents with high spatial resolution, high frame rate, and high dimensionality, leading to increased memory storage and processing demands.
Innovation Solution
A method and device for jointly coding horizontal and vertical components of a motion vector difference using correlation between motion vector differences, employing a pre-defined layer structure to derive and encode motion vector predictors, and generating prediction blocks based on layer and index information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If motion vector differences are encoded separately for horizontal and vertical components, then encoding simplicity is maintained, but coding efficiency is reduced
Solution Approach 1:
The patent merges the encoding of horizontal and vertical motion vector difference components into a unified process. Instead of encoding dx and dy separately, the invention applies a layer structure that jointly processes both components, exploiting their correlation to achieve better compression efficiency while maintaining manageable encoding complexity through systematic organization.
Solution Approach 2:
The patent introduces a layer dimension to the motion vector difference encoding process. By organizing the encoding into multiple layers where different combinations of horizontal and vertical components are processed at different layers, the invention transforms a two-dimensional encoding problem into a three-dimensional solution space, enabling more efficient exploitation of component correlations.
2Manufacturing precision
If next-generation video contents with high spatial resolution and high frame rate are processed, then video quality is improved, but memory storage and processing demands increase
Solution Approach 1:
The patent combines the encoding of multiple motion vector difference components into a unified layer structure. By merging related components and exploiting their correlations, the invention reduces the total amount of data that needs to be stored and processed, thereby decreasing memory storage and processing demands while maintaining high video quality.
3Productivity
If individual encoding of motion vector components is performed, then encoding process is simple, but coding efficiency is reduced
Solution Approach 1:
The patent segments the motion vector difference encoding into multiple layers, where each layer handles specific combinations of horizontal and vertical components. This segmentation allows the complex joint encoding process to be organized into manageable sections, making the encoding process more systematic and less error-prone while achieving better coding efficiency through exploitation of component correlations.
Data Source
AI summary
A method and device derive a motion vector difference of a current block based on layer information and index information, where the layer information indicates a current layer to which a motion vector difference used in inter prediction of the current block belongs and index information indicates a specific combination in the current layer, and thereby the MVD coding efficiency may be significantly increased by coding the horizontal and vertical components of the MVD together based on layer information and index information.