Constrained Inter-Image Prediction for Screen Content
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Solution Overview
Problem
Existing video data compression systems face high computational complexity in implementing inter-prediction for screen content sequences, which achieves high compression ratios but is resource-intensive.
Innovation Solution
A constrained inter-image prediction mode is introduced, where the number of candidate block positions and reference images is reduced, allowing for a simpler prediction process by fixing the motion vector and reference index at zero, thereby reducing computational complexity without significant loss in compression performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If inter-prediction is applied to screen content sequences, then compression ratio is improved, but computational complexity increases substantially
Solution Approach 1:
The patent changes the parameters of inter-prediction by fixing the motion vector to (0,0) and limiting reference image selection, transforming the complex inter-prediction process into a simpler constrained mode that maintains compression efficiency while reducing computational burden
Solution Approach 2:
The patent applies a partial form of inter-prediction by constraining the motion vector to specific values and limiting reference image candidates, achieving sufficient compression for screen content without the full computational overhead of general inter-prediction
2Device complexity
If the number of candidate block positions and reference images is reduced, then computational complexity is decreased, but prediction accuracy may deteriorate
Solution Approach 1:
The patent changes the search parameters by fixing motion vector to (0,0) and limiting reference image candidates, which reduces computational complexity while maintaining sufficient prediction accuracy for screen content sequences characterized by temporal redundancy
Solution Approach 2:
The patent applies different prediction strategies to different content types by using constrained inter-prediction specifically for screen content sequences, where temporal redundancy makes this simplified approach effective without sacrificing overall prediction quality
Data Source
AI summary
A method encoding image data including: encoding the image data by an inter-image predictor in which a block of one or more samples of a current image is predicted from a reference block of samples located at one of a number of candidate block positions in a reference image; and selectively applying a constrained inter-image prediction mode in which, in comparison to an inter-image prediction mode for the encoding, one or both of the number of candidate block positions and the number of candidate reference images is reduced.