Patent ID: 7782378

Claim:
A scene-based non-uniformity correction method employing local constant statistics for eliminating fixed pattern noise in a video comprising a plurality of input images, comprising the steps of: (a) providing an initial gain image, an initial offset image, a predetermined pyramid level, and a filter of a predetermined level; (b) setting one of the plurality of input images to a current image; (c) calculating a temporary true scene image for the current image based on the initial gain image and the initial offset image; (d) accumulating a temporal mean image and a temporal standard deviation image based on the calculated temporary true scene image; (e) setting another of the plurality of images to the current image and repeat steps (c) -(e) until substantially all of the images of the plurality of images have been processed, otherwise further performing the steps of: (f) calculating a Gaussian mean image based on the accumulated temporal mean and calculating a Gaussian gain image based on the accumulated temporal standard deviation image; (g) spectrum shaping the Gaussian mean image and the Gaussian gain image based on the predetermined pyramid level and the filter of the predetermined level; (h) multiplying the spectrum shaped Gaussian gain image by the initial gain image to obtain a final gain image; and (i) multiplying the spectrum shaped Gaussian mean image by the initial gain image and add the initial offset image to obtain a final offset image.