Dual-Flag MPM List Intra Prediction for High-Resolution Video
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Solution Overview
Problem
The increasing demand for high-resolution, high-quality video and immersive media formats such as VR and AR necessitates more efficient image compression techniques to reduce transmission and storage costs while maintaining image quality.
Innovation Solution
An image coding method that constructs an MPM list using primary and secondary MPM flag information to derive intra prediction modes, generating prediction samples and reconstructed samples for improved coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional intra prediction methods are used for high-resolution video, then transmission and storage costs increase, but image quality must be maintained
Solution Approach 1:
The patent segments the intra prediction mode selection process into multiple stages: first constructing an MPM list with candidate modes, then using primary and secondary MPM flags to selectively refine this list. This segmented approach allows the system to focus computational resources only on promising candidate modes rather than evaluating all possible intra prediction modes, thereby reducing bit rate while maintaining prediction accuracy for high-resolution video
Solution Approach 2:
The patent performs preliminary action by pre-constructing the MPM (Most Probable Mode) list before the actual intra prediction mode derivation. The MPM list is built using neighboring block information and geometric properties, and is refined through primary and secondary MPM flags. This preliminary preparation reduces the search space for the final mode selection, enabling efficient compression of high-resolution video without sacrificing image quality
2Manufacturing precision
If more bits are transmitted for high-resolution video, then image quality improves, but transmission and storage costs increase
Solution Approach 1:
The patent introduces dynamic adaptability through the primary and secondary MPM flags, which are determined based on the specific characteristics of each current block and its neighboring blocks. The refinement process dynamically adjusts the MPM list composition according to local image properties, allowing the encoder to allocate bits more efficiently - using fewer bits when the MPM list accurately predicts the mode and more bits only when necessary, thereby maintaining image quality while reducing overall bit rate for high-resolution video
Solution Approach 2:
The patent changes the parameter of intra prediction mode representation by introducing a two-stage flag system (primary MPM flag and secondary MPM flag) that modifies the traditional mode signaling approach. Instead of directly signaling the intra prediction mode, the system signals flags that refine the MPM list, changing the parameter space from direct mode indices to iterative refinement indicators. This parameter transformation reduces the average number of bits required to represent intra prediction modes in high-resolution video while preserving image quality
Data Source
AI summary
According to one embodiment of the present disclosure, a method by which a decoding device decodes an image is provided. The method comprises the steps of: acquiring image information including primary most probable mode (MPM) flag information and secondary MPM flag information; configuring an MPM list including candidate intra prediction modes for the current block on the basis of the primary MPM flag information and/or the secondary MPM flag information; deriving an intra prediction mode for the current block from among the candidate intra prediction modes included in the MPM list; generating a prediction sample for the current block on the basis of the intra prediction mode; generating a restoration sample for the current block on the basis of the prediction sample.