Intra-frame Prediction Mode Derivation for Video Coding
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Solution Overview
Problem
Existing video coding techniques face challenges in efficiently compressing high-resolution images and 3D video content, particularly in deriving accurate intra prediction modes and configuring effective reference pixels for improved coding efficiency.
Innovation Solution
A method and apparatus for deriving intra prediction modes based on default or MPM candidates, configuring reference pixels, and performing filtering on these pixels, which includes determining the intra prediction mode using a candidate list and applying offsets based on block shape and filtering based on flags, to enhance intra prediction accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional intra prediction methods are used, then the coding process is simple, but the coding efficiency is insufficient for high-resolution images
Solution Approach 1:
The current block is divided into multiple sub-blocks, and intra prediction is performed separately for each sub-block. This segmentation allows the patent to achieve better coding efficiency for high-resolution images by capturing local variations within each sub-block, while keeping the overall process manageable through systematic division.
Solution Approach 2:
The patent dynamically determines the intra prediction mode for each sub-block based on neighboring block modes and block characteristics. Instead of using a fixed prediction mode for the entire block, the method adapts the prediction mode locally, improving coding efficiency while maintaining reasonable complexity through context-adaptive decision-making.
2Measurement precision
If reference pixels are not filtered, then the processing is faster, but the intra prediction accuracy is reduced
Solution Approach 1:
The patent applies filtering selectively to reference pixels based on their position and the specific prediction context. Instead of uniformly filtering all reference pixels, the method applies filtering only where it most improves prediction accuracy, thereby achieving better precision while minimizing the time loss associated with filtering operations.
3Adaptability or versatility
If a fixed intra prediction mode is used, then the encoding is simpler, but the adaptability to different block characteristics is poor
Solution Approach 1:
The patent enables the encoding system to automatically determine the most suitable intra prediction mode for each block based on neighboring block modes and current block characteristics. The system serves itself by making adaptive decisions without requiring external intervention, improving adaptability while managing complexity through systematic analysis of available information.
Solution Approach 2:
The patent changes the intra prediction mode parameter dynamically based on block characteristics and neighboring block modes. By adjusting the prediction mode parameter according to local image characteristics, the method achieves high adaptability to different block types while maintaining reasonable encoding complexity through context-based selection.
Data Source
AI summary
A video coding/decoding method and device, according to the present invention, may enable: deriving an intra-frame prediction mode of a current block; configuring a reference pixel for the intra-frame prediction of the current block; and carrying out the intra-frame prediction of the current block on the basis of the intra-frame prediction mode and the reference pixel. The intra-frame prediction mode of the current block is derived on the basis of any one of MPM candidates or a predetermined default mode.