Patent ID: 7505612
Filing Date: 2009-03-17
Classification: G06K

Abstract:
1. An image construction method, in which an apparatus equipped with a sensor mechanism to read a series of partial images representing a fingerprint from a finger which conducts a slide operation successively stores partial images read by the sensor mechanism, sets an inspection region, which is used to find a difference quantity between a latest partial image and an already acquired partial image in the successively stored partial images, in the already acquired partial image along a displacement direction of a plurality of consecutive already acquired partial images, sets a retrieval range for a position of superposition of the latest partial image on the already acquired partial image on the basis of a position of the inspection region, causes displacement of the latest partial image with respect to the already acquired partial image in the retrieval range and finds a difference quantity between the already acquired partial image and the latest partial image concerning the inspection region every displacement, determines displacement of the latest partial image corresponding to a minimum difference quantity among the found difference quantities as the position of superposition, and disposes the latest partial image in the position of superposition with respect to the already acquired partial image and stores the latest partial image.