Restoration Filter Generation Device for Image Processing

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Solution Overview

Problem

Existing image restoration technologies face issues with overcorrection when performing restoration processing on luminance system image data, particularly due to differences in optical transfer functions across colors, leading to degraded image quality.

Innovation Solution

A restoration filter generation device and method that acquires difference information on optical transfer functions and generates a restoration filter with weakened restoration strength based on these differences, ensuring the filter is not biased towards specific colors or optical system variations, thereby reducing overcorrection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If restoration processing is performed on luminance system image data using a restoration filter generated from average optical transfer function, then restoration processing can be applied to all colors, but phase overcorrection occurs in specific color wavelengths

Engineering Contradiction:

Improverestoration processing applicabilityVSAvoidphase correction accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by generating separate restoration filters for different color channels (R, G, B) instead of using a single average filter. Each filter is optimized for its specific color's optical transfer function characteristics, preventing phase overcorrection in specific wavelengths while maintaining restoration effectiveness across all colors.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the parameter of restoration filter generation from using average optical transfer function to using color-specific optical transfer functions. This parameter change allows the restoration processing to adapt to the unique characteristics of each color channel, eliminating the overcorrection problem while preserving the ability to process all colors.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If restoration filter strength is increased to improve restoration effect, then image quality improves, but overcorrection and artifacts increase

Engineering Contradiction:

Improveimage restoration qualityVSAvoidovercorrection artifacts

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent optimizes the restoration filter strength parameter by generating filters based on actual color-specific optical transfer functions rather than average functions. This allows the restoration strength to be precisely controlled for each color channel, achieving high restoration quality without excessive overcorrection that would create artifacts.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9865039B2Restoration filter generation device and image processing device

Publication Date: 2018.01.09 FUJIFILM CORP

AI summary

A restoration filter generation device according to one embodiment of the present invention includes: an information acquisition unit that acquires information showing a difference that depends on a color of an optical transfer function of an optical system; and a restoration filter generation unit that generates a restoration filter, which weakens restoration strength according to the difference that depends on the color of the optical transfer function on the basis of the information acquired by the information acquisition unit, and makes the restoration strength of the restoration filter weaker than the restoration strength of an ideal filter decided assuming that the difference that depends on the color of the optical transfer function does not exist. As a result, the overcorrection is reduced.