Intra Prediction Mode Refinement for Video Coding
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Solution Overview
Problem
Current video compression technologies face challenges in accurately predicting the prediction mode of a current block, especially when the neighbor block is coded using a different scheme or has a different shape and size, leading to inefficiencies in prediction coding.
Innovation Solution
The method refines the prediction mode of a neighbor block by using reconstructed pixels and adjacent reference pixels to generate a prediction mode candidate list, allowing for accurate intra prediction mode selection and adaptation to different coding schemes and block configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the prediction mode of a neighbor block is used to predict the prediction mode of a current block, then the prediction accuracy improves, but the problem arises when the neighbor block is coded using a different scheme or has a different shape and size
Solution Approach 1:
The patent applies parameter changes by transforming the prediction mode determination process to accommodate different block configurations. When the neighbor block has a different shape, size, or coding scheme, the patent modifies the prediction approach by selecting alternative candidate modes from a predefined set, thereby adapting the prediction parameters to match the current block's characteristics while maintaining prediction accuracy.
2Measurement precision
If conventional prediction methods are used without refinement, then the processing complexity remains low, but the prediction accuracy deteriorates when neighbor blocks have different configurations
Solution Approach 1:
The patent segments the prediction mode selection process into distinct stages: first identifying candidate prediction modes based on neighbor block configuration, then evaluating these candidates against the current block's characteristics, and finally selecting the optimal mode. This segmentation allows the system to maintain low complexity for standard cases while providing enhanced accuracy when needed, by only activating the refined prediction process when configuration mismatches are detected.
Data Source
AI summary
The present invention provides a method for processing a video signal, comprising generating a prediction block for a neighbor block using a reconstructed reference pixel of the neighbor block when the neighbor block adjacent to a current block is intra-coded; determining a refined intra prediction mode of the neighbor block based on the prediction block, where the refined intra prediction mode represents a mode which minimizes an error between the prediction block and a reconstructed neighbor block; generating a prediction mode candidate list for the current block based on the refined intra prediction mode; selecting an intra prediction mode for the current block from the prediction mode candidate list; and performing a prediction for the current block based on the intra prediction mode.