Deblocking Filter Boundary Strength for CPR-Based Image Coding

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Solution Overview

Problem

The increasing demand for high-resolution and high-quality images and videos, along with the rise of immersive media formats, necessitates a high-efficiency image and video compression technology to reduce transmission and storage costs while maintaining image quality.

Innovation Solution

An image coding method that enhances compression efficiency by deriving boundary strength for deblocking filtering based on prediction modes of adjacent blocks, applying deblocking filtering to improve image quality by efficiently removing artifacts at block boundaries.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If high-resolution and high-quality image and video data are transmitted or stored using existing media, then image quality is improved, but transmission costs and storage costs are increased

Engineering Contradiction:

Improveimage qualityVSAvoiddata amount

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the boundary strength parameter in deblocking filtering based on prediction mode information. This optimization of filtering parameters improves compression efficiency without sacrificing image quality, thereby reducing the amount of data that needs to be transmitted or stored while maintaining high-quality output

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If deblocking filtering is performed with fixed boundary strength, then processing simplicity is maintained, but image quality at block boundaries is degraded

Engineering Contradiction:

Improveimage quality at boundaryVSAvoidfiltering process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent implements local quality by deriving different boundary strength values for different block boundaries based on the prediction modes of adjacent blocks. This allows the deblocking filter to apply appropriate filtering strength locally at each boundary, improving image quality where needed while maintaining processing efficiency through rule-based determination

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies preliminary action by determining the boundary strength value before performing the deblocking filtering operation. The boundary strength is derived in advance based on prediction mode information from adjacent blocks, allowing the filtering process to proceed efficiently with pre-determined parameters rather than requiring complex real-time adjustments

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12627842B2Image coding method and device using deblocking filtering

Publication Date: 2026.05.12 LG ELECTRONICS INC

AI summary

A method by which a decoding device decodes an image, according to the present document, comprises the steps of: generating a restoration picture on the basis of prediction samples of a coding block; deriving a boundary strength (BS) for a boundary of the coding block in the restoration picture; performing deblocking filtering on the boundary of the coding block on the basis of the boundary strength; and deriving a modified restoration picture for the restoration picture on the basis of the deblocking filtering, wherein the boundary strength is derived on the basis of a prediction mode of a first block and a second block that are adjacent to the boundary of the coding block, and the prediction mode of the first block or the second block is derived on the basis of whether the prediction mode of the first block or the second block is a current picture referencing (CPR) mode to be coded in reference to a current picture.