Alternative MPM List Configuration for Intra Prediction
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Solution Overview
Problem
There is a need for highly efficient image compression techniques to effectively transmit, store, and reproduce high-resolution and high-quality images, as existing methods incur increased transmission and storage costs due to the large amount of image data.
Innovation Solution
The proposed method and apparatus enhance image coding efficiency by configuring an alternative Most Probable Mode (MPM) list for intra prediction in image coding systems. This is achieved by deriving an intra prediction mode for a current block based on an alternative MPM list configured using the intra prediction modes of neighboring blocks, specifically the top and left neighboring blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional image transmission and storage methods are used for high-resolution images, then image quality is maintained, but transmission cost and storage cost increase
Solution Approach 1:
The patent extracts only the essential visual information by using intra-prediction to generate predicted blocks from neighboring blocks, and only encodes the difference (residual) between the actual and predicted blocks. This extraction principle allows maintaining image quality while significantly reducing the amount of data that needs to be transmitted and stored
Solution Approach 2:
The patent changes the representation parameters of image data by using multiple prediction modes (vertical, horizontal, diagonal, planar, DC) to describe the same image content in different ways. By selecting the most efficient prediction mode and representing only the residual error, the data parameters are optimized to reduce transmission and storage requirements while preserving image quality
2Measurement precision
If multiple prediction modes are used for intra prediction, then prediction accuracy improves, but computational complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining a limited set of common prediction modes (vertical, horizontal, diagonal, planar, DC) that cover most typical image patterns. By preparing these prediction templates in advance and selecting only from this predefined set, the system achieves high prediction accuracy while avoiding the computational burden of considering all possible prediction directions
Solution Approach 2:
The patent introduces dynamics by adaptively selecting the most appropriate prediction mode for each block based on its local characteristics. The system dynamically chooses from multiple prediction modes depending on the image content, allowing prediction accuracy to vary with local patterns while maintaining manageable computational complexity through selective application
3Ease of operation
If MPM list is configured using only left and top neighboring blocks, then encoding simplicity is maintained, but prediction efficiency is limited
Solution Approach 1:
The patent applies segmentation by dividing the neighboring blocks into different categories (left, top, and other available neighbors) and selectively using them to configure the MPM list. This segmentation allows the system to maintain simplicity for common cases while incorporating additional neighbors when they provide beneficial predictive information, thus improving efficiency without sacrificing too much simplicity
Data Source
AI summary
An image decoding method performed by a decoding apparatus according to the present disclosure comprises the steps of: obtaining a reference sample line index of a current block and most probable mode (MPM)-related information; constructing an alternative MPM list on the basis of the reference sample line index; deriving an intra prediction mode of the current block on the basis of the alternative MPM list and the MPM-related information; and generating a predicted block of the current block on the basis of the intra prediction mode, wherein the alternative MPM list is constructed on the basis of an intra prediction mode of an upper adjacent block of the current block and an intra prediction mode of a left adjacent block of the current block.