MIP Picture Coding with Unified Right-Shift Offset Parameters
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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, affecting coding and decoding efficiency.
Innovation Solution
Implementing a uniform offset parameter to unify the right shift parameters for different sizes and MIP mode numbers, 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 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 by introducing a unified offset parameter that adjusts the right shift amount dynamically based on block size and MIP mode number, instead of storing separate right shift parameters for each combination. This reduces the number of parameters that need to be stored while maintaining the ability to achieve accurate predictions for different block sizes and modes.
2Measurement precision
If MIP mode is adopted for luma prediction with different block sizes, then prediction accuracy is improved, but processing time is prolonged
Solution Approach 1:
The patent pre-calculates and stores a unified offset parameter that can be used across different block sizes and MIP modes. This preliminary preparation allows the encoder and decoder to quickly determine the appropriate right shift amount without performing complex lookups or calculations during the actual prediction process, thereby reducing processing time while maintaining prediction accuracy.
3Measurement precision
If separate right shift parameters are stored for different sizes and MIP mode numbers, then prediction precision is maintained, but parameter storage and retrieval complexity increases
Solution Approach 1:
The patent creates a universal offset parameter that serves multiple functions across different block sizes and MIP modes. Instead of having separate parameters for each specific case, this single unified parameter can be applied universally by combining it with the block size and mode information to derive the appropriate right shift amount, simplifying the parameter management system while maintaining precision.
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.