Gradient-Aided Bi-Directional Motion Prediction for Video Coding
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Solution Overview
Problem
Conventional video codecs struggle with efficient encoding and decoding of high-resolution or high-quality video content due to limitations in encoding methods based on tree structures, leading to inefficient data compression and large data transformation.
Innovation Solution
Implement bi-directional motion prediction mode in video codecs by using pixel values and gradient values of reference blocks to generate prediction pixel values through interpolation filters, enhancing encoding and decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional tree-structure encoding methods are used, then device complexity is reduced, but manufacturing precision (encoding accuracy) deteriorates
Solution Approach 1:
The current block is divided into multiple sub-blocks, and each sub-block is independently predicted using bi-directional motion prediction. This segmentation allows for more precise local prediction while maintaining manageable complexity through standardized processing of each sub-block.
Solution Approach 2:
Different motion prediction methods are applied to different regions (sub-blocks) of the current block based on local characteristics. This enables higher encoding accuracy in regions requiring detailed prediction while using simpler methods elsewhere, resolving the contradiction between precision and complexity.
2Manufacturing precision
If bi-directional motion prediction with gradient values is implemented, then manufacturing precision (prediction accuracy) is improved, but device complexity increases
Solution Approach 1:
Gradient values are calculated and used selectively in bi-directional motion prediction rather than applying complex prediction methods universally. This partial application of advanced techniques improves prediction accuracy where needed while avoiding unnecessary complexity in regions where simpler methods suffice.
3Manufacturing precision
If interpolation filters are applied to generate prediction pixel values, then manufacturing precision is improved, but productivity (encoding speed) deteriorates
Solution Approach 1:
The interpolation filter parameters and processing granularity are optimized to balance accuracy and speed. By adjusting parameters such as filter tap length and processing block size, the system achieves adequate prediction accuracy while maintaining acceptable encoding speed, resolving the contradiction between precision and productivity.
Data Source
AI summary
A video decoding and video encoding method of performing inter prediction in a bi-directional motion prediction mode, in which a prediction pixel value of a current block may be generated by not only using a pixel value of a first reference block of a first reference picture and a pixel value of a second reference block of a second reference picture, but also using a first gradient value of the first reference block and a second gradient value of the second reference block, in a bi-directional motion prediction mode. Accordingly, encoding and decoding efficiency may be increased since a prediction block similar to an original block may be generated.