Intra Prediction With Rectangular ISP Blocks for Video Coding
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Solution Overview
Problem
Existing video signal processing methods lack efficiency in compression coding, particularly in handling spatial and temporal correlations, necessitating improved techniques for video signal encoding and decoding.
Innovation Solution
Implementing position-dependent intra prediction combination (PDPC) and low-frequency non-separable transform (LFNST) in intra sub-partition units, dividing current blocks into transform blocks for enhanced prediction and reconstruction, and applying position-dependent intra prediction sample filtering based on block dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional video compression coding is used, then basic compression is achieved, but coding efficiency is insufficient
Solution Approach 1:
The current block is divided into multiple transform blocks through intra sub-partition (ISP), allowing independent processing of different regions. This segmentation enables better adaptation to local characteristics and improves overall coding efficiency by handling spatial correlations at a finer granularity
Solution Approach 2:
Position-dependent intra prediction sample filtering is applied selectively based on the position and size of transform blocks. The filtering strength and application are adapted locally to each transform block's characteristics, improving prediction accuracy where needed while maintaining efficiency elsewhere
2Measurement precision
If intra prediction is performed on the entire current block, then prediction is simplified, but prediction accuracy is reduced
Solution Approach 1:
The current block is divided into multiple transform blocks, enabling independent intra prediction for each sub-block. This allows the prediction to adapt to local variations in the image content, improving accuracy by capturing local structures that would be lost in a global prediction approach
Solution Approach 2:
Different prediction and filtering strategies are applied to different transform blocks based on their position and characteristics. The position-dependent filtering adapts the prediction quality locally, providing higher accuracy for blocks that benefit from it while using simpler processing for others
3Measurement precision
If position-dependent intra prediction sample filtering is applied to all blocks, then prediction accuracy is improved, but processing complexity increases
Solution Approach 1:
Position-dependent intra prediction sample filtering is applied selectively based on the position and size of each transform block. The filtering is adapted to local characteristics, improving prediction accuracy for blocks where it provides benefit while avoiding unnecessary processing in blocks where it would not improve results
Solution Approach 2:
The filtering parameters are changed based on the position and dimensions of transform blocks. By adapting the filtering strength and application conditions to local block characteristics, the system achieves better prediction accuracy while controlling processing complexity through conditional application
Data Source
AI summary
Disclosed are a video signal processing method and device whereby a video signal is encoded or decoded. The video signal processing method may comprise the steps of: determining whether an intra sub-partition (ISP) mode is applicable to a current block; if the ISP mode is applicable to the current block, splitting the current block into a plurality of rectangular transform blocks in the horizontal or vertical direction; generating prediction blocks of the transform blocks by carrying out intra prediction on each of the transform blocks; and reconstructing the current block on the basis of residual blocks of the transform blocks, and the prediction blocks.