Residual Coefficient Differential Coding for Efficient Image Compression

Solution Overview

Problem

The increasing demand for high-resolution and high-quality images leads to a significant increase in transmission and storage costs due to the increased amount of information, necessitating high-efficient image compression technologies.

Innovation Solution

An image encoding/decoding method and apparatus that utilizes differential encoding of residual coefficients, splitting residual coefficient subblocks according to a differential encoding direction, and determining a scan order of residual coefficient subblocks to improve encoding/decoding efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If high-resolution and high-quality image data is transmitted, then image quality is improved, but transmission cost and storage cost increase

Engineering Contradiction:

Improveimage qualityVSAvoidamount of transmitted information

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The residual block is divided into multiple residual coefficient subblocks, and each subblock is processed separately with differential encoding applied within each subblock. This segmentation allows for more efficient compression while preserving image quality by treating different regions with appropriate encoding strategies.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the encoding parameters by applying differential encoding to residual coefficients instead of conventional encoding methods. This parameter change in the encoding process reduces the bitrate required to represent the same image quality, thereby reducing transmission and storage costs.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional encoding methods are used, then encoding process is simple, but encoding efficiency is insufficient

Engineering Contradiction:

Improveencoding efficiencyVSAvoidencoding process complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The residual block is divided into multiple residual coefficient subblocks, and each subblock is processed separately with differential encoding applied within each subblock. This segmentation allows for more efficient compression while preserving image quality by treating different regions with appropriate encoding strategies.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the encoding parameters by applying differential encoding to residual coefficients instead of conventional encoding methods. This parameter change in the encoding process reduces the bitrate required to represent the same image quality, thereby reducing transmission and storage costs.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12506873B2Method and device for coding/decoding image using differential coding of residual coefficient, and method for transmitting bitstream

Publication Date: 2025.12.23 LG ELECTRONICS INC

AI summary

An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may include obtaining a residual block of a current block encoded in an intra prediction mode from a bitstream, deriving a modified residual block by performing differential encoding with respect to the residual block, based on differential encoding mode information obtained from the bitstream indicating a differential encoding mode of a residual coefficient, and deriving a residual block of the current block by performing dequantization with respect to the modified residual block.