Chroma Prediction Filtering in CCP-Based Video Coding
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Solution Overview
Problem
Existing video coding technologies, such as MPEG-2, MPEG-4, ITU-T H.263, ITU-T H.264/MPEG-4 AVC, and ITU-T H.265 HEVC, require improvements in coding quality for digital video processing.
Innovation Solution
Implementing cross-component prediction (CCP) to filter chroma prediction, selecting a CCP candidate from a set of candidates, and performing conversions based on first information regarding whether to filter the chroma prediction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cross-component prediction (CCP) is applied to predict chroma component, then coding quality is improved, but prediction accuracy for chroma component deteriorates due to lack of filtering
Solution Approach 1:
The patent extracts and removes the chroma prediction generated by CCP from the final chroma block, separating the prediction process from the actual chroma data. This allows the system to benefit from CCP's coding quality improvements while avoiding the accuracy deterioration by not using the extracted prediction for final chroma reconstruction.
Solution Approach 2:
The patent introduces a filtering mechanism as an intermediary between the CCP prediction process and the final chroma block. This filter selectively processes the chroma prediction, removing inaccurate portions while preserving useful information, thereby mediating between the conflicting requirements of coding quality and prediction accuracy.
2Productivity
If chroma prediction is filtered based on first information, then coding efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent implements dynamic filtering where the filtering operation is selectively applied based on first information (such as picture type, slice type, or other contextual parameters). The system transitions between filtered and unfiltered states dynamically, optimizing coding efficiency for specific conditions while avoiding unnecessary processing complexity when filtering is not required.
Solution Approach 2:
The patent changes the parameter state of the chroma prediction processing based on first information. By modifying parameters such as prediction strength, filter application, or mode selection according to contextual conditions, the system achieves improved coding efficiency without consistently increasing processing complexity.
Data Source
AI summary
Embodiments of the present disclosure provide a solution for video processing. A method for video processing is proposed. The method comprises: obtaining, for a conversion between a current video block of a video and a bitstream of the video, first information regarding whether to filter a prediction for a chroma component of the current video block, wherein the prediction for the chroma component is determined with a cross-component prediction (CCP) candidate, and the CCP candidate is selected from a set of CCP candidates in a CCP-based mode; and performing the conversion based on the first information.