Deblocking Filter Adjustment for Affine Inter Prediction
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Solution Overview
Problem
Current video coding technologies, such as HEVC, face limitations in compression capability, and there is a need for next-generation video coding standards that can significantly outperform them, particularly in handling affine inter prediction and deblocking methods for improved encoding and decoding efficiency.
Innovation Solution
The proposed solution involves changing the deblocking method corresponding to edges of affine subblocks in video data coded with affine inter prediction, enabling enhanced decoding of video data by modifying the deblocking filter strength based on conditions such as the enablement of affine prediction with optical flow or reference picture scaling, thereby improving encoding and decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If HEVC video coding standard is used, then compression capability is achieved, but compression efficiency is insufficient for next-generation requirements
Solution Approach 1:
The patent changes the deblocking filter strength parameter specifically for affine inter prediction modes. By setting the deblocking filter strength to a specific value (e.g., bypassing the filter or using reduced strength) when affine inter prediction is used, the patent improves compression efficiency by reducing the bitrate required to encode block boundaries, while maintaining visual quality through the predictive nature of affine motion compensation.
2Measurement precision
If affine inter prediction is applied, then prediction accuracy is improved, but encoding complexity increases
Solution Approach 1:
The patent applies different deblocking filter strengths to different prediction modes locally. Specifically, affine inter prediction modes receive special treatment with reduced or bypassed deblocking filtering, while other modes use standard filtering. This localized approach maintains high prediction accuracy where needed (affine modes for complex motion) while reducing overall encoding complexity by simplifying the filtering process for these specific modes.
3Manufacturing precision
If deblocking filter strength is increased, then block boundary artifacts are reduced, but encoding and decoding time increases
Solution Approach 1:
The patent applies deblocking filtering partially by selectively reducing or bypassing the filter for affine inter prediction modes. Instead of applying full-strength deblocking filtering to all blocks, the patent uses a conditional approach where affine inter blocks receive reduced filtering (partial action), thereby maintaining acceptable block boundary quality while significantly reducing the computational time required for encoding and decoding operations.
Data Source
AI summary
A method, computer program, and computer system is provided for decoding video data. Video data coded with affine inter prediction is received. A deblocking method corresponding to edges of affine subblocks associated with the received video data is changed. The video data is decoded based on the changed deblocking method.