Image Processing Correcting Astigmatism Modulation Factors
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Solution Overview
Problem
Existing image processing methods for high-resolution cameras, such as 4K or 8K UHDTVs, face challenges in correcting the modulation factor of lenses where the circumferential and radial direction modulation factors significantly differ, leading to insufficient performance due to uncorrected astigmatism, especially in affordable apochromatic lenses.
Innovation Solution
An image processing method that performs horizontal and vertical contour corrections, calculating correction amounts proportional to various powers of the distance from the center of the screen based on lens type information, focal length, and aperture ratio, to individually correct the modulation factors and address astigmatism in lenses with differing circumferential and radial direction modulation factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lens correction methods are used, then manufacturing cost is reduced, but image quality deteriorates due to uncorrected astigmatism in affordable apochromatic lenses
Solution Approach 1:
The patent applies parameter changes by implementing differential contour correction with different correction amounts for circumferential and radial directions. The correction amount is calculated based on the distance from the center of the screen, applying larger corrections to peripheral areas where astigmatism effects are more pronounced. This software-based parameter adjustment resolves the contradiction by achieving high image quality without requiring expensive optically corrected lenses.
2Measurement precision
If high-resolution imaging is implemented, then image detail is improved, but lens aberration effects are amplified making correction more difficult
Solution Approach 1:
The patent segments the correction process into distinct circumferential and radial components. By dividing the modulation factor correction into these two independent directions, the system can apply targeted correction amounts to each direction based on the specific aberration characteristics. This segmentation makes the complex aberration correction task manageable and effective for high-resolution imaging.
Solution Approach 2:
The patent implements local quality by applying position-dependent correction amounts that vary across the screen. The correction amount is calculated based on the distance from the center, with larger corrections applied to peripheral regions where astigmatism has greater impact. This localized approach optimizes correction effectiveness for high-resolution images while maintaining computational efficiency.
3Manufacturing precision
If circumferential and radial modulation factors are corrected equally, then processing simplicity is maintained, but correction accuracy deteriorates due to different aberration characteristics in different directions
Solution Approach 1:
The patent applies asymmetry by implementing different correction amounts for circumferential and radial directions. The correction process intentionally treats these two directions differently, with the correction amount for each direction calculated independently based on its specific aberration characteristics. This asymmetric correction approach significantly improves correction accuracy while maintaining reasonable processing complexity through efficient calculation methods.
Data Source
AI summary
There is disclosed an image processing method in which a video signal is inputted from an imaging optical system in which astigmatism remains, and is displayed on a two-dimensional display apparatus. Based on the circumferential direction modulation factor and radial direction modulation factor of a lens used in the imaging optical system, a signal including the amount of vertical or horizontal modulation factor correction proportional to an nth power (n is an integer greater than 1) of a distance from a center position of a screen of the two-dimensional display apparatus is outputted for at least one vertical or horizontal frequency of the two-dimensional display apparatus.