Unified Intra Prediction Candidate Lists for Image Decoding
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Solution Overview
Problem
The increasing demand for high-resolution, high-quality images leads to higher transmission and storage costs due to the increased amount of information, necessitating a more efficient image compression technique.
Innovation Solution
A method and apparatus for improving image coding efficiency by deriving an intra prediction mode candidate list, considering reference line indexes, and using a unified intra prediction mode list construction process to reduce dependency on intra prediction types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional image compression techniques are used for high-resolution images, then transmission and storage costs increase, but image quality and resolution requirements cannot be met
Solution Approach 1:
The patent changes the parameter of prediction mode construction by introducing a unified intra prediction mode candidate list that is constructed independently of prediction type. This parameter change enables more efficient compression while maintaining high image quality, thereby reducing transmission and storage costs for high-resolution images
2Manufacturing precision
If separate construction processes are used for different intra prediction types, then coding precision improves, but device complexity increases
Solution Approach 1:
The patent applies universality by constructing a unified intra prediction mode candidate list that serves all intra prediction types (PMIP, MRL, ISP) simultaneously. This single unified construction process replaces multiple separate processes, reducing hardware and software complexity while maintaining coding precision through the comprehensive nature of the unified list
3Manufacturing precision
If dependency on multiple intra prediction types is maintained, then prediction accuracy improves, but ease of operation deteriorates
Solution Approach 1:
The patent extracts the prediction type dependency from the candidate list construction process. By constructing the unified intra prediction mode candidate list independently of specific prediction types, the system simplifies the operation of deriving intra prediction modes while still achieving accurate prediction through the comprehensive unified list that accommodates all prediction types
Data Source
AI summary
A method for decoding an image by a decoding device according to the present document comprises the steps of: receiving prediction-related information of a current block; deriving an intra prediction type of the current block on the basis of the prediction-related information; forming an intra prediction mode candidate list of the current block on the basis of intra prediction modes of blocks neighboring the current block; deriving an intra prediction mode of the current block on the basis of the intra prediction mode candidate list; and deriving reference samples of the current block on the basis of the intra prediction type and the intra prediction mode, and deriving a prediction sample on the basis of the reference samples.