Intra-frame Prediction Mode Selection Using Adjacent Coding Unit References
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Solution Overview
Problem
Existing intra-frame prediction mode determination methods in video compression technologies are inefficient, leading to wasted computing resources and potential image compression losses, especially for coding standards with a large number of prediction modes.
Innovation Solution
A method and apparatus for determining an intra-frame prediction mode of a current video block by selecting an optimal prediction mode from a set of alternative modes based on reference modes from adjacent and parent coding units, reducing complexity and improving coding efficiency without compromising compression performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all intra-frame prediction modes are evaluated to determine the optimal mode, then compression performance is improved, but computing complexity and processing time increase significantly
Solution Approach 1:
The patent segments the set of all possible intra-frame prediction modes into multiple subsets based on different criteria (e.g., directional modes, non-directional modes, modes from adjacent CUs). Instead of evaluating all modes uniformly, the method processes them in segmented groups, selecting reference modes from specific segments and constructing alternative prediction mode sets that are then evaluated. This segmentation reduces the effective search space while maintaining compression performance.
Solution Approach 2:
The patent applies preliminary action by pre-determining reference modes from adjacent CUs and parent CUs before the main prediction mode selection process. These reference modes are used to construct alternative prediction mode sets in advance, which are then evaluated. This preliminary preparation reduces the computational burden during the actual mode selection by avoiding redundant evaluations of obviously suboptimal modes.
2Productivity
If the number of prediction modes to be evaluated is reduced, then processing speed increases, but compression performance may deteriorate
Solution Approach 1:
The patent applies local quality by constructing alternative prediction mode sets that are tailored to the specific characteristics of each current CU. Instead of using a uniform set of prediction modes for all CUs, the method adapts the alternative prediction mode sets based on the local context, including the determined reference modes from adjacent and parent CUs. This allows the system to evaluate only the most relevant prediction modes for each local region, improving both speed and performance.
Solution Approach 2:
The patent introduces intermediary structures in the form of alternative prediction mode sets that serve as mediators between the full set of possible prediction modes and the final selected mode. These alternative sets are constructed from reference modes and preset modes, acting as an intermediate filtering layer that reduces the number of modes to be evaluated while preserving the most promising candidates for final selection.
3Productivity
If reference modes from adjacent and parent CUs are used to construct alternative prediction mode sets, then coding efficiency is improved, but the dependency on neighboring block information increases
Solution Approach 1:
The patent applies universality by designing a framework that can handle multiple CU configurations and neighboring block arrangements through a single unified process. The method generically determines reference modes from adjacent and parent CUs regardless of the specific spatial arrangement or CU size, using a standardized approach to construct alternative prediction mode sets. This universal framework maintains adaptability while improving coding efficiency through consistent reference mode utilization.
Data Source
AI summary
The present disclosure provides a method and an apparatus for determining an intra-frame prediction mode of a current video block. The method includes determining, in an image area including a to-be-coded current video block, reference modes of the current video block based on a plurality of intra-frame prediction modes of a plurality of second video blocks, the image area being in an area defined by an adjacent coding unit (CU) and a father CU corresponding to the current video block in a video frame or slice including the current video block; determining an alternative prediction mode set from preset intra-frame prediction modes, the alternative prediction mode set comprising a plurality of alternative prediction modes, including the reference modes; and determining, in the alternative prediction mode set, a prediction mode having optimal intra-frame prediction coding performance on the current video block as an intra-frame prediction mode of the current video block.