IBC Merge List Construction for Video Coding Efficiency
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Solution Overview
Problem
Existing video coding technologies face challenges in achieving high compression ratios with minimal sacrifice in picture quality, particularly in video encoding and decoding processes.
Innovation Solution
The method involves constructing a candidate merge list for Intra Block Copy (IBC) mode by inserting specific block vectors from neighboring blocks and history-based motion vector predictors, while removing pruning to enhance the merge list, thereby improving the encoding and decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pruning is applied to the merge list to reduce complexity, then device complexity is reduced, but video coding efficiency deteriorates
Solution Approach 1:
The patent extracts and removes the pruning operation from the merge list construction process. By taking out the pruning step that was previously applied to reduce merge list candidates, the patent maintains a more comprehensive candidate set without adding complex pruning logic, thus resolving the contradiction between complexity reduction and efficiency maintenance
Solution Approach 2:
Instead of applying pruning to reduce complexity (the conventional approach), the patent inverts the approach by maintaining the full candidate set without pruning. This inversion allows the system to achieve better coding efficiency while managing complexity through alternative means such as the enhanced IBC merge list construction
2Productivity
If the merge list is enhanced with more candidates to improve coding efficiency, then video coding efficiency is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary action by pre-defining the merge list construction rules to include IBC merge candidates from neighboring blocks. By establishing the candidate selection criteria in advance through standardized rules (checking left and above neighbors, verifying IBC mode usage, comparing block vectors), the system can maintain an enhanced merge list without requiring complex runtime decision-making
Solution Approach 2:
The patent changes the parameters of the merge list construction by modifying how candidates are selected and inserted. Specifically, it changes the candidate source to include IBC block vectors from spatial neighbors, adjusts the insertion conditions based on IBC mode detection, and modifies the list population strategy. These parameter changes enhance coding efficiency while keeping the construction process systematic and manageable
Data Source
AI summary
The present disclosure provides methods and devices of construct a candidate merge list for Intra block copy (IBC) mode, the method comprising: inserting a block vector of a left neighboring block of a current block into an initial merge list, when the left neighboring block is available and the left neighboring block is using IBC mode; inserting a block vector of an above neighboring block of the current block into the initial merge list, when the above neighboring block is available, the above neighboring block is using IBC mode and the block vector of the above neighboring block is not same as the block vector of the left neighboring block; inserting a block vector of the last candidate in a history based motion vector predictor (HMVP) into the initial merge list; obtaining a block vector of the current block according to the initial merge list.