In-Loop Filtering for Mapping-Based Video Block Artifacts
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Solution Overview
Problem
Existing video compression techniques face challenges in maintaining coding efficiency and image quality due to changes in signal characteristics between or within blocks during mapping processes, necessitating a method to address these variations.
Innovation Solution
In-loop filtering is applied to compensate for signal characteristic changes by determining target regions for deblocking filtering, calculating mapping offsets, and encoding or decoding information on mapping relations to enhance video quality and coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mapping is applied to original signals or residual signals to increase coding efficiency, then coding efficiency is improved, but signal characteristics change between blocks or within blocks causing video quality degradation
Solution Approach 1:
The patent applies in-loop filtering to the reconstructed image before it is used for further encoding/decoding operations. This preliminary filtering action compensates for signal characteristic changes caused by mapping, preventing quality degradation from propagating through subsequent processing stages while maintaining the coding efficiency benefits of mapping.
Solution Approach 2:
The patent converts the harmful effect of mapping-induced signal characteristic changes into a beneficial filtering opportunity. By detecting regions where mapping has been applied and applying targeted in-loop filtering to those regions, the patent transforms the quality degradation problem into a chance to enhance video quality through selective filtering that compensates for the mapping effects.
2Reliability
If in-loop filtering is applied to compensate for signal characteristic changes, then video quality is enhanced, but additional processing complexity is introduced
Solution Approach 1:
The patent applies in-loop filtering selectively to specific regions of the reconstructed image where mapping has been applied, rather than uniformly to the entire image. This local approach targets only the areas that need quality compensation, reducing unnecessary processing complexity in regions where mapping was not applied while still enhancing video quality where needed.
Solution Approach 2:
The patent divides the reconstructed image into multiple regions based on mapping application status, identifying target regions where mapping has been applied. This segmentation allows the filtering process to be applied only to relevant portions of the image, reducing overall processing complexity compared to applying filtering to the entire image while still achieving quality enhancement in the critical areas.
3Quantity of substance
If mapping is applied to compress video data, then data transmission requirements are reduced, but blocking artifacts increase at block boundaries
Solution Approach 1:
The patent introduces in-loop filtering as an intermediary process between the mapping operation and the final reconstructed image output. This intermediary filtering step smooths transitions at block boundaries where mapping has created discontinuities, reducing blocking artifacts while preserving the data compression benefits of mapping. The filter acts as a mediator that reconciles the compression efficiency with visual quality.
Data Source
AI summary
A method and an apparatus are disclosed for in-loop filtering in mapping-based video coding. A video coding method and an apparatus compensate for variations in signal characteristics between blocks or within a block by using in-loop filtering when original signals or residual signals are mapped in a particular way and then video encoding or video decoding is performed.