Patent ID: 6483932
Filing Date: 2002-11-19
Classification: G06K

Abstract:
A method for rolled fingerprint capture, comprising the steps of:(1) detecting the start of a fingerprint roll, including the steps of: (a) generating a pixel intensity difference count value between a current fingerprint image frame and a previous fingerprint image frame, including the steps of comparing the intensity of a plurality of pixels in the current fingerprint image frame to the intensity of a corresponding plurality of pixels in the previous fingerprint image frame, and summing pixels determined to have different intensities during said comparing step to generate the pixel intensity difference count value, and (b) determining whether the generated pixel intensity difference count value is greater than a start roll sensitivity threshold value; (2) capturing a plurality of fingerprint image frames; (3) determining a centroid window corresponding to each of the plurality of captured fingerprint image frames; (4) knitting pixels of each determined centroid window into a composite fingerprint image; and (5) detecting the end of said fingerprint roll.