Image Restoration Filter for Phase Degradation Correction
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Solution Overview
Problem
Existing image processing methods fail to effectively correct the phase degradation component of images captured by image pickup systems, leading to asymmetrical blur and noise amplification, while also struggling to maintain the pre-restoration amplitude characteristic.
Innovation Solution
An image processing method utilizing an image restoration filter specifically designed to reduce the phase degradation component of images, based on the optical transfer function of the image pickup system, which corrects the phase component without amplifying noise by setting the image restoration filter to cancel out the phase component and maintain the amplitude component's frequency characteristic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional image restoration processing is applied to correct both amplitude and phase degradation components, then image sharpness is improved, but noise is amplified
Solution Approach 1:
The patent segments the image degradation correction into two separate components: amplitude degradation correction and phase degradation correction. By dividing the restoration process, the invention applies different correction strategies to each component, allowing phase correction without the noise amplification that occurs when correcting both components simultaneously using conventional methods.
Solution Approach 2:
The invention extracts and isolates the phase degradation component from the overall image degradation. By separating the phase component from the amplitude component, the patent applies correction only to the phase degradation, eliminating the harmful noise amplification effect that occurs when full restoration processing is applied to both components.
2Measurement precision
If conventional image restoration processing is applied to correct phase degradation, then asymmetrical blur is reduced, but pre-restoration amplitude characteristic is not maintained
Solution Approach 1:
The patent segments the degradation correction into separate amplitude and phase components. By correcting only the phase degradation component while leaving the amplitude component unchanged, the invention maintains the pre-restoration amplitude characteristic while still achieving effective blur correction.
Solution Approach 2:
The invention applies correction locally and selectively only to the phase degradation component, while preserving the original amplitude characteristic. This localized correction approach ensures that each component is treated according to its specific requirements, maintaining amplitude stability while improving phase accuracy.
Data Source
AI summary
An image processing method includes the steps of obtaining an image generated by an image pickup system, and performing correction processing for the image by utilizing an image restoration filter generated or selected based on an optical transfer function of the image pickup system. The image restoration filter is a filter configured to reduce a phase degradation component of the image.