Patent ID: 7079251

Claim:
A method of correcting measurement data obtained from a multi-channel imaging system, comprising the steps of: a) producing a sub-image in each channel of the system using a predetermined wavelength; b) dividing each sub-image produced by the system into a plurality of sub-regions; c) measuring a geometric distortion introduced by the system in each sub-region of each sub-image by measuring a spatial displacement with respect to a predetermined reference position of an image feature in each sub-region of each sub-image produced by the system using a cross-correlation algorithm for each sub-region of each sub-image; d) determining a correction factor corresponding to said geometric distortion introduced by the system in each sub-region of each sub-image by calculating correction factors as required to negate said spatial displacement in each sub-region of each sub-image produced by the system; e) using said correction factor for each sub-region of each sub-image to establish a correction coefficient for each sub-image pixel and to produce a corresponding geometric correction matrix for each sub-image; and f) applying said geometric correction matrix to remove geometric distortion from measurement sub-images produced by the system.