Image Coding With Multiple MPM Lists for High-Resolution Compression

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Solution Overview

Problem

High-resolution and high-quality images result in increased data volumes, leading to higher costs for transmission and storage, necessitating improved image encoding/decoding techniques for enhanced compression efficiency.

Innovation Solution

An image decoding method utilizing multiple Most Probable Mode (MPM) lists for intra prediction, including current, upper level, and neighboring blocks, with optimized flag encoding/decoding to enhance compression efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If high-resolution and high-quality image data is transmitted or stored using conventional methods, then image quality is maintained, but transmission and storage costs increase due to increasing data volumes

Engineering Contradiction:

Improveimage qualityVSAvoiddata volume

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The patent applies parameter changes by modifying the intra prediction mode selection process. It introduces multiple MPM lists with different candidate modes and uses mode-dependent filtering to adaptively select the most appropriate prediction mode. This changes the parameters of the prediction process to achieve better compression efficiency while maintaining image quality, thereby reducing data volume for transmission and storage.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional intra prediction techniques are used, then encoding complexity is reduced, but compression efficiency is insufficient for high-resolution images

Engineering Contradiction:

Improvecompression efficiencyVSAvoidencoding complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the intra prediction mode selection into multiple stages. It creates multiple MPM lists (first MPM list, second MPM list, third MPM list) with different candidate modes, and segments the mode selection process based on neighboring block modes. This segmented approach allows the decoder to efficiently search through organized candidate modes, improving compression efficiency without excessively increasing decoding complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies preliminary action by pre-defining multiple MPM lists with candidate prediction modes before the actual prediction process. The encoder and decoder both prepare these MPM lists in advance based on neighboring block information, so that during decoding, the most probable modes are already available for quick selection. This preliminary preparation improves compression efficiency while keeping the actual decoding operation relatively simple.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12457329B2Image encoding/decoding method, apparatus, and recording medium for storing bitstream

Publication Date: 2025.10.28 LX SEMICON CO LTD

AI summary

The present invention relates to an image encoding/decoding method and apparatus. The image decoding method according to the present invention may comprise constructing N MPM lists for a current block, wherein N is equal to or greater than 1, deriving an intra prediction mode of the current block based on the N MPM lists, and performing intra prediction for the current block based on the intra prediction mode.