Deflection Angle Detection Method Study for Two Fingerprint Images Based on the Fingerprint Character Ring

Since the fingerprint image is quasi-periodical, to reduce the True Rejection Rate (TRR) and the Fault Acception Rate (FAR) of image matching, this paper presented a new deflection angle detection method for two fingerprint images based on the character ring of image amplitude-frequency figure. First, rotation and translation between the two images are separated in theory. Then character rings are extracted respectively and coordinate transformation is taken. Thus the offset is calculated by phase correlation algorithm and turned into deflection angle. Matching experiment using this method shows that the TRR is 0.7137% and the FAR is 0.