Video Coding With IBC-LIC Compensation for Prediction Accuracy
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Solution Overview
Problem
Existing video coding technologies, such as MPEG-2, MPEG-4, AVC, HEVC, and VVC, require further improvements in coding efficiency for digital video processing.
Innovation Solution
Implementing intra block copy (IBC) and local illumination compensation (LIC) in video processing to enhance prediction and reconstruction, improving coding efficiency by determining the application of IBC-LIC to video units and performing compensation processes using a model.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional video coding technologies (MPEG-2, MPEG-4, AVC, HEVC, VVC) are used, then basic video compression is achieved, but coding efficiency is insufficient and requires further improvement
Solution Approach 1:
The patent combines IBC (intra block copy) and LIC (local illumination compensation) into a unified IBC-LIC mechanism. This merging allows the system to leverage both block copying and illumination compensation capabilities simultaneously, improving coding efficiency by handling both geometric and photometric variations in a single integrated framework, thereby resolving the contradiction between coding efficiency and processing complexity
Solution Approach 2:
The IBC-LIC mechanism serves multiple functions: it performs intra block copy for geometric structure preservation, applies local illumination compensation for lighting variation correction, and provides a unified prediction model for both operations. This multi-functionality enables a single mechanism to address multiple coding challenges, improving overall coding efficiency without proportionally increasing complexity
2Reliability
If IBC-LIC is applied to video units, then prediction and reconstruction are enhanced, but additional processing steps are required
Solution Approach 1:
The system performs preliminary determination to identify which video units are suitable for IBC-LIC application. By pre-screening and selecting appropriate candidates before applying the full IBC-LIC processing, the system enhances prediction accuracy for relevant blocks while avoiding unnecessary processing steps for blocks where IBC-LIC would not provide benefit, thus managing the complexity-tradeoff
Solution Approach 2:
The patent applies IBC-LIC selectively to specific local regions (video units) where it is most beneficial, rather than uniformly applying it to the entire video frame. This local application strategy allows the system to enhance prediction accuracy in regions where illumination compensation and block copying are most effective, while minimizing additional processing complexity in regions where conventional methods suffice
Data Source
AI summary
Embodiments of the disclosure provide a solution for video processing. A method for video processing is proposed. The method includes: determining, for a conversion between a video unit of a video and a bitstream of the video, whether an intra block copy (IBC) and local illumination compensation (LIC) (IBC-LIC) is applied to the video unit based on a model used for the IBC-LIC; in accordance with a determination that the IBC-LIC is applied to the video unit, performing a compensation process to a prediction/reconstruction of the video unit using a model of the IBC-LIC; and performing the conversion based on the compensated prediction/reconstruction of the video unit.