Subblock Deblocking Filter for Video Coding Efficiency
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Solution Overview
Problem
Conventional de-blocking filtering methods are inefficient for small block sizes in new video partition structures, leading to increased computational load and interaction between boundaries, which affects video encoding and decoding processes.
Innovation Solution
A method that applies de-blocking processing to sub-block boundaries within a current block, allowing for constrained filtering based on sub-block mode prediction, such as Advanced Temporal Motion Vector Prediction or affine mode, to reduce the number of samples filtered and minimize interaction between boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional de-blocking filtering methods are applied to small block sizes, then video quality improvement is achieved, but computational load increases significantly
Solution Approach 1:
The current block is divided into multiple sub-blocks, and de-blocking filtering is applied selectively to sub-block boundaries rather than the entire block boundary. This segmentation approach reduces the number of samples that need to be filtered, thereby reducing computational load while maintaining video quality improvement where it is most needed at sub-block transitions
Solution Approach 2:
Different filtering approaches are applied to different regions: sub-block boundaries receive de-blocking filtering to improve local video quality, while other areas may use alternative methods or no filtering. This local quality principle allows computational resources to be concentrated where they provide the most benefit, reducing overall computational load
2Manufacturing precision
If de-blocking filtering is applied to all block boundaries, then blocking artifacts are reduced, but interaction between boundaries increases
Solution Approach 1:
By segmenting the block into sub-blocks and applying de-blocking filtering only at sub-block boundaries, the patent reduces the number of boundaries that interact with each other. This segmentation isolates the filtering operations, reducing the complexity of boundary interactions while still addressing blocking artifacts at the most critical sub-block level
Solution Approach 2:
The patent extracts and applies de-blocking filtering specifically to sub-block boundaries, separating this operation from the traditional whole-block boundary filtering. This extraction allows for targeted artifact reduction at sub-block boundaries without the complexity of coordinating filtering across all block boundaries
3Productivity
If sub-block mode prediction is used, then coding efficiency is improved, but de-blocking filtering complexity increases
Solution Approach 1:
The patent leverages the sub-block structure created by sub-block mode prediction and applies de-blocking filtering at these sub-block boundaries. While the sub-block structure adds complexity, the filtering is applied in a systematic and localized manner that prevents exponential complexity growth, maintaining a reasonable balance between coding efficiency and filtering complexity
Data Source
AI summary
Method and apparatus for constrained de-blocking filter are disclosed. One method receives input data related to a current block in a current picture at a video encoder side or a video bitstream corresponding to compressed data including the current block in the current picture at a video decoder side, and determines a first boundary associated with the current block, wherein the first boundary corresponds to one vertical boundary or one horizontal boundary of the current block. The method then applies de-blocking process to a reconstructed current block corresponding to the current block to result in a filtered-reconstructed current block, using a plurality of first reference samples at a same side of the first boundary, and replaces a first set of the first reference samples by one or more padding values. The method then generates a filtered decoded picture including the filtered-reconstructed current block.