Patent ID: 7016550
Filing Date: 2006-03-21
Classification: H04N

Abstract:
1. A method of processing image data received from a detector having a plurality of detector elements arranged in a two-dimensional array, the method comprising the steps of: correcting a frame of image data received from the detector using existing values of a set of correction coefficients, the set of correction coefficients comprising a plurality of offset coefficients corresponding to the plurality of detector elements; calculating an update parameter for each detector element using pixel data generated from said step of correcting, wherein the update parameter for a given detector element is calculated based upon multiple difference values determined from a given pixel value of the pixel data and multiple adjacent pixel values of the pixel data, the given pixel value corresponding to the given detector element, each difference value being determined by subtracting one of the multiple adjacent pixel values from the given pixel value; identifying offset coefficients whose existing values are to remain unchanged based upon the update parameters; and changing existing values of offset coefficients other than those identified to remain unchanged, wherein offset coefficients whose values are to be changed are determined by comparing the update parameters with threshold values, and by using a polarity of the update parameters.