Method for the full correction of the sharpness of an image, and associated system

EP4523172A1Pending Publication Date: 2025-03-19FOGALE NANOTECH SA
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Patent Information

Application Number
EP2023726496
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-05-13
Filing Date
2023-05-12
Publication Date
2025-03-19

AI Technical Summary

Technical Problem

Photographic devices face challenges in achieving sharp images across all parts of a scene, especially when there is movement or varying brightness, as reducing the aperture diameter improves sharpness but increases exposure time and may result in blurry foregrounds and backgrounds.

Method used

A method that corrects image sharpness by using a function F(dO, ZO, a, b) describing the imaging system's response, which depends on the distance between the imaged part and the sensor, and the adjustment of the imaging system, applied to each coordinate of the input image to produce a restored IR image, allowing for iterative convolution to minimize defects such as aberration and blur.

Benefits of technology

This method enables sharp images to be obtained without the need for long exposure times or multiple images, maintaining maximum numerical aperture for short capture times and ensuring clarity in both foregrounds and backgrounds, even in low light conditions.

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Abstract

The invention relates to a method for correcting at least one input image Ie into an image being rendered IRk and then into a rendered image IR, the at least one input image originating from at least one optical sensor provided with photosites of different colors and being obtained through at least one optical imaging system, each sensor being associated with an optical imaging system, said method involving: - receiving the at least one input image Ie, - iteratively modifying the image IRk being rendered at different iterations k, by iteratively processing a function E comprising two terms, i.e. a first term D, which depends on a comparison between the at least one input image Ie and a result Ick of the image IRk being rendered at the iteration k reprocessed by information relating to the at least one imaging system, and a second term P, which depends on one or more anomalies or penalties or defects within the image IRk being rendered at the iteration k, until the function E is minimized.
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