Deblocking Filter Rounding for Video Block Boundary Smoothing
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Solution Overview
Problem
Conventional image coding and decoding methods are ineffective in deblocking filtering, leading to visible block boundaries and negative impacts on human visual perception.
Innovation Solution
A filtering method is introduced that applies a deblocking filter to a current block of an image by judging whether a strong or weak filter is needed, calculating a linear combination of current and adjacent samples, shifting the combination, and clipping it to generate a filtered sample, with different clipping parameters for strong and weak filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional deblocking filtering is applied to image blocks, then block boundaries are reduced, but visible artifacts and negative visual perception remain
Solution Approach 1:
The patent changes the parameter of rounding operation from conventional methods to a specific rounding mode that rounds to the nearest even number. This parameter change in the filtering calculation resolves the contradiction by reducing block boundary artifacts while maintaining visual quality, as the rounding mode prevents systematic bias that causes visible filtering artifacts
2Object-affected harmful factors
If strong deblocking filter is applied to smooth block edges, then block boundaries are reduced, but filtering complexity and computational overhead increase
Solution Approach 1:
The patent applies local quality by using different clipping parameters (first clipping parameter and second clipping parameter) for different filtering scenarios. The method selectively applies strong or weak filtering based on local block characteristics, and uses rounding to nearest even number specifically where needed, rather than uniformly complex filtering across all blocks. This resolves the contradiction by reducing block edge visibility only where necessary while maintaining simpler processing elsewhere
Data Source
AI summary
The present disclosure relates to deblocking filtering which is applicable to smoothing the block boundaries in an image or video coding and decoding. In particular, the deblocking filtering is either strong or weak, wherein the clipping is performed differently in the strong filtering and the weak filtering.