wherein a voltage corresponding to a difference between the mean capacitance value for {TAIL ~ each pixel group} at the second step and the capacitance calculated at {HEAD ~ the third step} is detected, such that distortion of a fingerprint image formed by a dry or moist state of a finger brought into contact with the insulating layer surrounding the sensing electrodes can be corrected 
wherein a voltage corresponding to a difference between the mean capacitance value for { TAIL ~ each pixel group } at the second step and the capacitance calculated at { HEAD ~ the third step } is detected , such that distortion of a fingerprint image formed by a dry or moist state of a finger brought into contact with the insulating layer surrounding the sensing electrodes can be corrected
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH