Same-Size MIP Prediction for Lower-Complexity Picture Decoding
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Solution Overview
Problem
The current Versatile Video Coding (VVC) standard's Matrix-based Intra Prediction (MIP) mode requires significant computational resources and storage space due to the derivation of prediction blocks, which is inefficient.
Innovation Solution
A method is introduced to derive an MIP prediction block of the same size as the current block without the need for an up-sampling process, using a specific MIP size identifier and MIP matrix to reduce computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional MIP mode is used to derive prediction blocks, then prediction quality is improved, but computational resources and storage space requirements increase significantly
Solution Approach 1:
The patent extracts and eliminates the up-sampling process from the traditional MIP mode prediction block derivation. By directly deriving prediction blocks of the same size as the current block without requiring up-sampling, the solution removes the computationally intensive operation while maintaining prediction quality, thus resolving the contradiction between prediction accuracy and computational resource consumption
Solution Approach 2:
The patent changes the parameter of prediction block size to match the current block size directly, eliminating the need for size transformation through up-sampling. This parameter change fundamentally alters the computation flow, reducing both computational complexity and storage requirements while preserving the essential prediction functionality
2Measurement precision
If traditional MIP mode with up-sampling process is used, then prediction accuracy is maintained, but encoding and decoding efficiency decreases
Solution Approach 1:
The patent removes the up-sampling process from the MIP mode implementation, directly deriving prediction blocks of the same size as the current block. This extraction of the inefficient up-sampling step significantly reduces processing time and computational load, thereby improving encoding and decoding efficiency while maintaining prediction accuracy through the simplified same-size derivation approach
3Measurement precision
If traditional MIP mode is implemented, then prediction quality is improved, but storage space requirements increase
Solution Approach 1:
The patent extracts and eliminates the up-sampling process that requires additional storage space. By directly deriving prediction blocks of the same size as the current block without intermediate up-sampling operations, the solution reduces storage requirements while maintaining prediction quality, thus resolving the contradiction between prediction accuracy and storage space consumption
Data Source
AI summary
A method for decoding a picture, a method for encoding a picture, an encoder, and a decoder are provided. The method for encoding a picture includes (i) determining a width and a height of a coding block in the picture; (ii) if the width and the height are equal to N, where N is a positive integer power of 2, determining a matrix-based intra prediction (MIP) size identifier indicating that an MIP prediction size equal to N; (iii) deriving a group of reference samples of the coding block; and (iv) deriving an MIP prediction of the coding block based on the group of reference samples and an MIP matrix corresponding to the MIP size identifier.