Image Intra-Prediction MPM Lists for High-Resolution Compression

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Solution Overview

Problem

The increasing resolution and quality of image data lead to higher data volumes, resulting in increased costs for transmission and storage, necessitating improved image encoding/decoding techniques for higher-resolution and higher-quality images.

Innovation Solution

An image encoding/decoding method that enhances compression efficiency through intra-prediction by configuring an MPM list based on neighbor block intra-prediction modes and frequencies, prioritizing certain modes for non-square blocks, and efficiently signaling intra-prediction modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If higher resolution and quality image data is used, then image quality is improved, but data volume increases leading to higher transmission and storage costs

Engineering Contradiction:

Improveimage qualityVSAvoiddata volume

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The image is divided into multiple blocks that are processed independently through intra-prediction. Each block is segmented and predicted based on its neighboring blocks, allowing efficient compression while maintaining overall image quality. The MPM list mechanism segments the prediction modes into most probable and other modes for differential encoding.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses intra-prediction to copy pixel values from neighboring blocks to predict the current block's pixel values. This copying mechanism allows the decoder to reconstruct image data without transmitting all original pixel values, significantly reducing data volume while preserving image quality.

Inventive Principle:

Principle #26Copying

2Productivity

If conventional image encoding techniques are used, then implementation is simple, but compression efficiency is insufficient for high-resolution images

Engineering Contradiction:

Improvecompression efficiencyVSAvoidencoding complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent performs preliminary action by constructing an MPM (Most Probable Mode) list before encoding the intra-prediction mode. The encoder and decoder both pre-construct the same MPM list based on neighboring block modes, allowing the actual mode to be encoded with fewer bits by indicating only the index within the MPM list rather than the full mode value.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the parameter representation by introducing the MPM list structure. Instead of directly encoding the intra-prediction mode index, the system encodes an index into the MPM list, which contains the most probable modes. This parameter transformation reduces the average number of bits required per block while maintaining encoding accuracy.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12418677B2Image encoding/decoding method and device, and recording medium storing bit stream

Publication Date: 2025.09.16 INTELLECTUAL DISCOVERY 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 configuring an MPM list based on intra-prediction modes of neighbor blocks of a current block and a number of frequencies of the intra-prediction modes of the neighbor blocks, deriving an intra-prediction mode of the current block based on the MPM list, and performing intra-prediction for the current block based on the intra-prediction mode.