Neighbor-Based Intra Prediction for Lower-Complexity Video Coding
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to a surge in data volume, resulting in higher transmission and storage costs, necessitating improved encoding/decoding efficiency, particularly in intra prediction modes.
Innovation Solution
A method and device for video signal encoding/decoding that determines a candidate group for intra prediction mode based on a flag, using a first or second candidate group, where the second group is derived from neighboring block modes with added or subtracted values, and performs intra prediction based on a predetermined reference region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality image data is transmitted or stored using existing media and storage systems, then image quality is maintained, but transmission expenses and storage expenses increase
Solution Approach 1:
The patent extracts and transmits only the essential visual information by using intra prediction to generate reference blocks from neighboring blocks, then only encoding the difference (residual) between the actual block and predicted block. This separates the prediction information (derived locally) from the residual information (transmitted), reducing the amount of data that needs to be transmitted while maintaining image quality.
Solution Approach 2:
The patent creates a copy of the neighboring block through intra prediction to serve as a reference block, then uses this copied information to predict the current block. This allows the decoder to reconstruct the image without transmitting all original pixel data, reducing transmission and storage requirements while maintaining visual quality.
2Manufacturing precision
If the number of candidate modes for intra prediction is increased to improve prediction accuracy, then encoding precision improves, but the complexity of mode selection and processing increases
Solution Approach 1:
The patent segments the candidate modes into two distinct groups: MPM (Most Probable Mode) candidates derived from neighboring block modes, and non-MPM candidates. This segmentation allows the decoder to first attempt matching against the smaller MPM group (reducing complexity), and only if no match is found, proceed to search the larger non-MPM group. This hierarchical segmentation reduces the average complexity of mode selection while maintaining the ability to achieve high prediction accuracy.
Solution Approach 2:
The patent performs preliminary action by pre-defining the MPM candidate group based on neighboring block modes before the actual mode matching process. This preliminary grouping of likely candidates allows the decoder to quickly eliminate obvious matches without exhaustively searching all possible modes, reducing processing complexity while maintaining prediction accuracy.
Data Source
AI summary
A video encoding/decoding device according to the present invention may determine an intra prediction mode of a current block on the basis of a most probable mode (MPM) of the current block or an intra prediction mode of a neighboring block, determine a reference region for intra prediction of the current block, and perform intra prediction on the current block by using the intra prediction mode and the reference region.