Method and apparatus for determining the stray-light point-spread function of an imaging system
AssigneePurdue Research Foundation
InventorsJan P. Allebach, Burak Bitlis, Peter Allan Jansson, Jianing Wei
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Abstract
A method of determining the point-spread function (PSF) of an imaging system includes the steps of capturing image data, establishing an idealized source spot, establishing a functional form model, subtracting the captured image from the estimated image equation and determining a metric that measures the fit of the estimated image to the captured image. The functional form model may include both diffraction and aberration and stray light. The functional form model may be optimized to reduce the metric to an acceptable level.
Claims20
A method of determining the point-spread function of an imaging system, the method comprising
- capturing image data,
- establishing an idealized source spot,
- establishing a functional form model for the effects of stray light,
- optimizing the functional form model for the effects of stray light to estimate the parameters of the functional form to arrive at an estimated image equation, and
- subtracting the captured image from the estimated image to establish a metric to evaluate the fit of an estimated point-spread function.
A method of correcting an image captured by an image system comprising the steps of
- establishing a point-spread function for the image system by, (i) capturing image data within the image system, (ii) establishing an idealized image, (iii) establishing a functional form model for the effects of stray light, (iv) subtracting the captured image from the estimated image to establish a metric to evaluate the fit of an estimated point-spread function, and (v) iterating the functional form model for the effects of stray light to reduce the metric to an acceptable level to thereby establish the point-spread function, and
- applying the point-spread function to captured image data to correct for the effects of stray light.
Dependencies are inferred from the claim text.