Patent ID: 9396381
Filing Date: 2016-07-19
CPC Classification: G06K

Claim Text:
1. A method for an optical fingerprint recognition, the method comprising: scanning a plurality of fingerprint images using a multiple scan which allows alternating a first scan condition and a second scan condition; determining whether an input fingerprint is a dry fingerprint depending on a darkness level of a fingerprint image that has been derived from the first scan condition and selected from among the plurality of scanned fingerprint images; and performing a fingerprint recognition using the scanned fingerprint image that has been derived from the first scan condition or using another of the scanned fingerprint images that has been derived from the second scan condition in accordance with the determination result as to the dry fingerprint, wherein an exposure time of the first scan condition is different from that of the second scan condition and a region scanned by the multiple scan using the first scan condition is the same as that scanned by the multiple scan using the second scan condition, wherein said performing the fingerprint recognition comprises: defining a following exposure time, wherein the following exposure time is derived from the difference between the fingerprint image derived from the first scan condition and the fingerprint image derived from the second scan condition; newly scanning a fingerprint image under a scan condition having the following exposure time; and applying the newly scanned fingerprint image to the fingerprint recognition.