Patent ID: 6184527
Filing Date: 2001-02-06
Classification: H04N

Abstract:
A method of calculating gain correction values to compensate gain errors of detector elements of a detector array, using a dither movement of said array, comprising the steps ofselecting a set of detector elements which includes a current detector element and at least one neighboring detector element;determining whether a gradient of scene information detected by one of the detector elements of the set exceeds a threshold;responding to detection in said determining step of a gradient exceeding the threshold by calculating a gain ratio for detector elements of the set based on dither paths thereof which are substantially parallel to the direction of the gradient exceeding the threshold;generating a gain correction value for the current detector element as a function of the calculated gain ratio; andrepeating said selecting, determining, responding and generating steps for additional sets of neighboring detector elements which each include a different current detector element, thereby determining a gain correction value for each of a number of the detector elements.