Cross-Component Intra Prediction for High-Efficiency Image Coding

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Solution Overview

Problem

High-resolution and high-quality image data requires high-efficiency encoding/decoding techniques to reduce the increased costs of transmission and storage due to larger data volumes.

Innovation Solution

An image decoding method that predicts a second color component block using a first color component block, with parameters derived from the first block, and an encoding apparatus that performs intra prediction to enhance compression efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If high-resolution and high-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 smaller blocks (e.g., 8x8, 16x16 pixels) called coding blocks, which are processed independently through quantization and encoding. This segmentation allows efficient compression while preserving quality by applying transform and quantization operations to each block, reducing overall data volume without significant quality loss

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies transform operations (such as discrete cosine transform) and quantization parameters to convert spatial frequency domain coefficients into a compressed representation. By adjusting quantization parameters and transform types, the system optimizes the balance between compression ratio and image quality, reducing data volume while maintaining acceptable quality levels

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional image encoding is used, then processing simplicity is maintained, but compression efficiency is insufficient for high-resolution images

Engineering Contradiction:

Improvecompression efficiencyVSAvoidencoding process complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The encoding process performs preliminary actions by first dividing the image into blocks, then applying transform operations to convert spatial frequencies to frequency domain representations before quantization. This preliminary transformation prepares the data for efficient compression by concentrating energy in fewer coefficients, enabling high compression efficiency through systematic preprocessing steps

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a continuous encoding pipeline where blocks are processed sequentially through transformation, quantization, and entropy encoding operations. This continuous processing of image data through multiple stages ensures high compression efficiency by systematically reducing data volume at each step while managing computational complexity through standardized operations

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS12375647B2Method and device for encoding/decoding image, and recording medium storing bit stream

Publication Date: 2025.07.29 LX SEMICON CO LTD

AI summary

An image encoding/decoding method and apparatus for predicting a second color component block using a first color component block are provided. An image decoding method of the present invention comprises deriving a prediction parameter using the first color component block, and predicting the second color component block using the derived prediction parameter.