Image Processing Device Phase Recovery Gradation Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image processing methods fail to effectively address image quality deterioration due to the point spread phenomenon caused by optical systems, leading to artifacts such as ringing and overshoot, especially when the characteristics of the restoration filter do not match the actual image quality deterioration characteristics of the source image data.
Innovation Solution
An image processing device that performs phase recovery processing followed by nonlinear gradation correction, and then frequency recovery processing, using filters specifically designed for the point spread function of the optical system, to effectively restore images and prevent artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency recovery processing and phase recovery processing are applied simultaneously using a restoration filter, then image quality deterioration due to point spread phenomenon is recovered, but artifacts such as ringing and overshoot occur when filter characteristics do not match actual image deterioration characteristics
Solution Approach 1:
The patent divides the restoration processing into two separate sequential processes: phase recovery processing followed by frequency recovery processing. This segmentation allows each process to be optimized independently and prevents the simultaneous application from causing mismatched filter characteristics that lead to artifacts.
Solution Approach 2:
The patent performs phase recovery processing as a preliminary step before frequency recovery processing. By correcting phase deterioration first, the subsequent frequency recovery can operate on already partially restored data, improving overall accuracy while reducing artifact generation.
2Productivity
If restoration filter characteristics do not match actual image quality deterioration characteristics, then processing speed is maintained, but image recovery accuracy deteriorates and artifacts are amplified
Solution Approach 1:
By separating restoration into phase and frequency components processed sequentially, the patent allows each stage to use appropriately matched filters for its specific function, improving overall accuracy without sacrificing processing speed.
Solution Approach 2:
The patent changes the processing parameters by separating the restoration task into two distinct stages with different filter characteristics optimized for each stage's specific requirements, rather than using a single filter with compromised parameters.
3Device complexity
If a single restoration filter is used for both phase and frequency recovery, then device complexity is reduced, but image quality deterioration is not effectively addressed and artifacts occur
Solution Approach 1:
The patent segments the restoration function into two separate processing units: a phase recovery processing unit and a frequency recovery processing unit. This segmentation enables each unit to use specialized filters optimized for its specific function, improving restoration accuracy while maintaining manageable system complexity through modular design.
Data Source
AI summary
Disclosed are an image processing device, an imaging device, an image processing method, and an image processing program capable of, when recovering a deteriorated image due to a point spread function of an optical system, effectively performing phase recovery and suppressing the occurrence of artifact due to frequency recovery processing. The image processing device includes a phase recovery processing unit which subjects image data acquired from an imaging element by capturing an object image using an optical system to phase recovery processing using a phase recovery filter based on a point spread function of the optical system, a gradation correction processing unit which subjects image data subjected to the phase recovery processing to nonlinear gradation correction, and a frequency recovery processing unit which subjects image data subjected to the gradation correction to frequency recovery processing using a frequency recovery filter based on the point spread function of the optical system.