Image Coding With Unified MPM Lists for Intra Prediction
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images and videos, particularly in immersive media formats, necessitates a high-efficiency image and video compression technology to reduce transmission and storage costs while maintaining image quality.
Innovation Solution
An intra prediction-based image coding method that utilizes a unified Most Probable Mode (MPM) list for deriving candidate intra prediction modes, including a DC mode, to enhance coding efficiency and simplify the intra prediction structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional separate MPM lists are used for different intra prediction modes, then prediction accuracy can be maintained for each mode, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent merges separate MPM lists for normal intra prediction, multiple reference line intra prediction, and subpartition intra prediction into a single unified MPM list. This consolidation reduces the number of separate data structures and simplifies the overall intra prediction structure while maintaining prediction accuracy through a common candidate mode derivation process.
Solution Approach 2:
The unified MPM list serves multiple intra prediction modes simultaneously, making it a universal structure that can be applied across different prediction types. The same MPM list construction and usage mechanism works for normal intra prediction, multiple reference line intra prediction, and subpartition intra prediction, reducing the need for mode-specific implementations.
2Manufacturing precision
If multiple separate MPM lists are maintained for different intra prediction types, then mode-specific optimization is achieved, but transmission and storage requirements increase
Solution Approach 1:
By combining multiple mode-specific MPM lists into one unified list, the patent reduces the total amount of data that needs to be transmitted and stored. Instead of maintaining separate lists for different intra prediction types, a single unified list suffices, thereby reducing bitstream overhead and storage requirements.
Solution Approach 2:
The unified MPM list provides a universal solution that can be used across multiple intra prediction modes without requiring separate transmissions for each mode. This multi-functional approach eliminates redundant data transmission while still providing mode-specific optimization through the unified structure.
3Manufacturing precision
If high-resolution and high-quality image and video data are transmitted using existing mediums, then image quality is maintained, but transmission costs and storage costs increase
Solution Approach 1:
The patent changes the structural parameter of the MPM list from multiple separate lists to a single unified list. This parameter change improves coding efficiency by reducing redundancy in the intra prediction process, which in turn reduces the number of bits required to encode the same image or video data, lowering transmission and storage costs while maintaining quality.
4Device complexity
If a unified MPM list is constructed for all intra prediction modes, then device complexity is reduced, but prediction capability may be compromised
Solution Approach 1:
The unified MPM list incorporates mode-specific characteristics through local adaptations in the candidate mode derivation process. While the list structure is unified, the construction method adjusts locally for different intra prediction modes (normal, multiple reference line, subpartition) to maintain optimal prediction capability for each mode without requiring separate lists.
Data Source
AI summary
An image decoding method according to the present document comprises the steps of: acquiring, from a bitstream, reference line index information indicating a reference line to be used for intra prediction of a current block; constructing a most probable mode (MPM) list by deriving candidate intra prediction modes of the current block on the basis of the value of the reference line index information; deriving the intra prediction mode of the current block on the basis of the MPM list; generating prediction samples for the current block on the basis of the intra prediction mode; and generating restoration samples for the current block on the basis of the prediction samples, wherein, on the basis of the case in which the value of the reference line index information is not zero, one of the candidate intra prediction modes is a DC mode and the number of candidate intra prediction modes including the DC mode is 5.