System and methods for determining nonuniformity correction parameters in detector-array imaging
First Claim
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1. A method for determining nonuniformity correction parameters for an element of a detector array, the method comprising the steps of:
- generating a plurality of estimates of uncorrupted images, each of the estimates being generated by fitting a parametric patch model into a neighborhood of noisy image samples and uniquely corresponding to one of a plurality of noisy images; and
determining at least one nonuniformity correction parameter by fitting a parametric curve to the plurality of estimates and the plurality of noisy images corresponding to each of the estimates.
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Abstract
An imaging system (110) for imaging a scene with a detector array (104) having an array of imaging elements is provided. The imaging system (110) includes an image estimation module (202) for generating a plurality estimates of uncorrupted images based upon a plurality of noisy images generated by the detector array (104). The imaging system (110) further includes a parameter determination module (204) for determining one or more nonuniformity correction parameters based upon the estimates of uncorrupted images.
23 Citations
20 Claims
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1. A method for determining nonuniformity correction parameters for an element of a detector array, the method comprising the steps of:
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generating a plurality of estimates of uncorrupted images, each of the estimates being generated by fitting a parametric patch model into a neighborhood of noisy image samples and uniquely corresponding to one of a plurality of noisy images; and
determining at least one nonuniformity correction parameter by fitting a parametric curve to the plurality of estimates and the plurality of noisy images corresponding to each of the estimates. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of updating nonuniformity correction parameters for an element of a detector array, the method comprising the steps of:
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(a) providing a plurality of noisy image samples;
(b) generating a plurality of estimates of uncorrupted images based upon the plurality of noisy image samples and an initial set of correction parameters, each of the estimates of uncorrupted images corresponding to a unique one of the plurality of noisy images;
(c) generating a plurality of noise-reduced estimates of uncorrupted images using a set of spatial-neighborhood observations, each of the noise-reduced estimates of uncorrupted images corresponding to a unique one of the estimates of uncorrupted images; and
(d) determining an updated set of correction parameters based upon a predefined mathematical relation between each of the noise-reduced estimates of uncorrupted images and corresponding one of the estimates of uncorrupted images. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An imaging system for imaging a scene with a detector array having an array of imaging elements, the system comprising:
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an image estimation module for generating a plurality estimates of uncorrupted images based upon a plurality of noisy images generated by the detector array; and
a parameter determination module for determining at least one nonuniformity correction parameter based upon the estimates of uncorrupted images. - View Dependent Claims (18, 19, 20)
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Specification