Intra-prediction Weighting for Image Coding Efficiency
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Solution Overview
Problem
High-resolution and high-quality image data requires efficient compression techniques to reduce transmission and storage costs, as conventional methods increase data quantity and decrease coding efficiency.
Innovation Solution
An intra-prediction method that combines conventional intra-prediction with template-based intra-prediction, deriving template reference samples and generating a modified predicted block by weighting intra-predicted and template predicted blocks, adaptively determining the weight based on intra-directional modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional intra-prediction methods are used for high-resolution images, then the images can be transmitted and stored, but the transmission cost and storage cost increase due to increased data quantity
Solution Approach 1:
The patent combines conventional intra-prediction with template-based intra-prediction to generate a modified predicted block. This merging of two prediction approaches allows for more accurate prediction of high-resolution image blocks, reducing the residual data that needs to be transmitted and stored, thereby lowering transmission and storage costs while maintaining image quality
2Productivity
If conventional intra-prediction methods are used, then coding can be performed, but coding efficiency decreases due to insufficient prediction accuracy
Solution Approach 1:
The patent merges conventional intra-prediction mode with template-based prediction by generating a modified predicted block that combines both approaches. This integration improves prediction accuracy for high-resolution images, allowing for more efficient coding with better compression ratios while maintaining image quality
Solution Approach 2:
The patent introduces a template matching process that searches for the most similar block in the reference picture, using similarity metrics to select optimal template reference samples. This parameter-based approach adapts the prediction to the specific content of each block, improving prediction accuracy and coding efficiency
3Measurement precision
If template-based intra-prediction is added to improve prediction accuracy, then prediction performance improves, but device complexity and auxiliary information transmission increase
Solution Approach 1:
The patent applies template-based prediction selectively by deriving template reference samples from neighboring reference samples and using them to generate a modified predicted block only where beneficial. This localized application improves prediction performance for specific blocks without requiring complete template matching for all blocks, thereby limiting the increase in device complexity and auxiliary information transmission
Data Source
AI summary
An intra-prediction method according to the present invention comprises the steps of: acquiring intra-prediction mode information from a bitstream; deriving neighboring reference samples of a current block; determining an intra-directional mode for the current block; deriving a predicted block for the current block based on the intra-directional mode and the neighboring reference samples; deriving template reference samples based on the neighboring reference samples; a template reference block based on the template reference samples; and generating a modified predicted block based on the predicted block and the template reference block. The present invention can generate a modified predicted block based on an intra-predicted block and a template reference block, thereby improving the intra-prediction performance.