Image Restoration Filter Brightness Adaptation

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Solution Overview

Problem

Existing image processing methods fail to effectively address image quality deterioration due to brightness variations and imaging conditions, leading to overcorrection and inconsistent sharpness in restored images, especially when dealing with high brightness regions or varying contrast levels.

Innovation Solution

An image processing device and method that employs a restoration filter based on a point spread function, combined with logarithmic gradation correction and sharpening processing, to adjust restoration and sharpening rates dynamically based on brightness information, ensuring accurate restoration and maintaining consistent image quality across different brightness levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If restoration processing is applied uniformly across all image regions, then overall image quality improves, but regions with varying brightness levels exhibit inconsistent sharpness and overcorrection artifacts

Engineering Contradiction:

Improveimage restoration accuracyVSAvoidsharpness consistency across brightness levels

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent applies different restoration rates to different image regions based on their brightness characteristics. Specifically, it divides the image into high brightness regions, low brightness regions, and intermediate regions, and applies different restoration processing intensities to each region. This local differentiation resolves the contradiction by maintaining high restoration accuracy where needed while preventing overcorrection in sensitive regions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent dynamically adjusts the restoration rate based on the brightness level of each image region. Rather than applying a fixed restoration rate uniformly, the system adapts the restoration intensity according to local brightness conditions, using higher rates for intermediate brightness regions and lower rates for extreme brightness regions. This dynamic adjustment resolves the contradiction between overall restoration quality and local sharpness consistency.

Inventive Principle:

Principle #15Dynamics

2Reliability

If restoration filter based on point spread function is used, then point spread phenomenon is corrected, but image quality deteriorates in high brightness and low brightness regions due to overcorrection

Engineering Contradiction:

Improvepoint spread correction effectivenessVSAvoidimage quality in extreme brightness regions

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies different restoration rates to different brightness regions to prevent overcorrection. For high brightness and low brightness regions where overcorrection artifacts occur, it uses lower restoration rates, while applying higher rates to intermediate brightness regions where the point spread function correction is most effective. This local differentiation resolves the contradiction by maintaining correction effectiveness where applicable while protecting sensitive regions from quality deterioration.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the restoration rate parameter based on brightness region classification. By adjusting this key parameter according to local brightness conditions, the system optimizes the balance between point spread correction effectiveness and prevention of overcorrection artifacts in extreme brightness regions.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If sharpening processing is applied after restoration processing, then image sharpness is enhanced, but ringing artifacts are amplified in regions with high contrast edges

Engineering Contradiction:

Improveimage sharpnessVSAvoidringing artifacts

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent applies different restoration rates to different brightness regions, which indirectly controls the amount of sharpening effect applied. By using lower restoration rates in high brightness and low brightness regions, the system reduces the generation of ringing artifacts in these sensitive areas while maintaining enhanced sharpness in intermediate brightness regions where ringing is less problematic.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9898807B2Image processing device, imaging device, image processing method, and program

Publication Date: 2018.02.20 FUJIFILM CORP

AI summary

The image processing device includes a gradation correction unit (gamma correction processing unit 33) which performs gradation correction, a restoration processing unit, a sharpening processing unit, a sharpening and recovery control unit 37 which is able to adjust a restoration rate of restoration processing and a sharpening rate of sharpening processing by controlling the restoration processing unit and the sharpening processing unit, a sharpening and recovery control unit 37 which acquires a total sharpening and restoration rate based on the restoration rate and the sharpening rate and one rate of the restoration rate and the sharpening rate and calculates the other rate of the restoration rate and the sharpening rate based on the total sharpening and restoration rate, and a brightness information acquisition unit. The sharpening and recovery control unit adjusts the restoration rate and the sharpening rate according to acquired brightness information.