Matrix-Based Intra Prediction Parameter Unification for Picture Coding
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Solution Overview
Problem
The existing MIP mode in video coding requires significant storage space and prolongs processing time due to varying parameters for luma blocks of different sizes, reducing coding and decoding efficiency.
Innovation Solution
Implementing a uniform offset parameter for right shift values across different sizes and MIP mode numbers to unify the right shift parameters, thereby reducing the need for table lookups and storage of multiple parameter sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MIP mode is adopted for luma prediction with different parameters for different block sizes, then prediction accuracy is improved, but storage space requirement increases and processing time is prolonged
Solution Approach 1:
The patent changes the parameter representation from multiple size-specific parameters to a unified parameter set with size-adaptive interpretation. Instead of storing separate parameters for each block size, the system uses a unified parameter table where parameters are interpreted differently based on block size, thereby reducing storage space while maintaining prediction accuracy for different block sizes
2Measurement precision
If MIP mode is adopted for luma prediction with different parameters for different block sizes, then prediction accuracy is improved, but processing time is prolonged
Solution Approach 1:
The patent performs preliminary organization of parameters into a unified table structure before the actual prediction process. By pre-organizing parameters with clear size-based indexing rules, the system eliminates the need for complex runtime parameter selection and table lookups, thereby reducing processing time while maintaining prediction accuracy
3Reliability
If multiple parameter sets are stored for different block sizes and MIP modes, then coding performance is maintained, but device complexity increases
Solution Approach 1:
The patent creates a universal parameter table that serves multiple functions for different block sizes and MIP modes. Instead of maintaining separate parameter sets, a single unified table is used where parameters are selected and interpreted based on block size and mode indicators, thereby reducing device complexity while maintaining coding performance across different scenarios
Data Source
AI summary
Picture coding and decoding methods, an encoder, a decoder and a storage medium are provided. The encoder, before performing coding processing according to a matrix-based intra prediction (MIP) mode, sets initial right shift parameters corresponding to different sizes and different MIP mode numbers as an uniform offset parameter, the offset parameter indicating a number of right shifting bits of a predicted value, and when performing coding processing according to the MIP mode, performs coding processing according to the offset parameter. The decoder, before performing decoding processing according to an MIP mode, sets initial right shift parameters corresponding to different sizes and different MIP mode numbers as an uniform offset parameter, the offset parameter indicating a number of right shifting bits of a predicted value, and when performing decoding processing according to the MIP mode, performs decoding processing according to the offset parameter.