Oblong Intra Prediction for Video Encoding Efficiency
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Solution Overview
Problem
The H.265/HEVC video compression standard limits video encoding efficiency due to its restriction on square prediction units for intra prediction, making it difficult to search for matching reference blocks, which adversely affects video encoding efficiency.
Innovation Solution
The method involves partitioning a coding unit into two oblong prediction units and further partitioning prediction units into sub-blocks, allowing for adaptive partitioning to improve the accuracy of finding matching reference blocks, thereby enhancing video encoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If square prediction units are used for intra prediction as specified in H.265/HEVC, then the encoding structure is simple and consistent, but the accuracy of finding matching reference blocks deteriorates and video encoding efficiency is adversely affected
Solution Approach 1:
The patent divides a square coding unit into multiple oblong prediction units with different aspect ratios (e.g., 1×2, 2×1, 1×4, 4×1). This segmentation allows the prediction units to better match the actual content characteristics in different regions, improving the accuracy of reference block matching while maintaining a structured encoding approach.
Solution Approach 2:
The patent changes the shape parameter of prediction units from fixed square to variable oblong shapes with different aspect ratios. By adjusting the aspect ratio parameter to match content characteristics, the system improves prediction accuracy and encoding efficiency while maintaining computational feasibility.
2Productivity
If oblong prediction units are used to improve reference block matching accuracy, then video encoding efficiency is improved, but the complexity of the encoding process increases
Solution Approach 1:
The patent dynamically selects the aspect ratio of prediction units based on content characteristics and encoding conditions. The encoder can adaptively choose between different oblong shapes (1×2, 2×1, 1×4, 4×1, etc.) to match the local content structure, improving efficiency while managing complexity through adaptive rather than fixed rules.
Solution Approach 2:
The system manages complexity by systematically varying the aspect ratio parameter within a defined set of options. This parameter-based approach allows flexible adaptation to different content types while maintaining a structured and manageable encoding process through standardized shape categories.
Data Source
AI summary
A video encoding method is provided in the invention. In such method, after a current encoding frame among a sequence of input frames is received, each coding unit in the current encoding frame may be optionally split into two oblong prediction units, and each of the prediction units may be optionally split into a plurality of sub-blocks so as to thereby improve the matching accuracy for a matching reference block from a reference frame. A video decoding method corresponding to the aforesaid video encoding method is also provided.