In a capacitive biometric sensor, in particular, a fingerprint sensor, to determine the maximum contrast that can actually be achieved in that application in the gray scale values, in particular, of a fingerprint (dynamic resolution of the sensor), at least one measurement point composed of a dielectric...http://www.google.fr/patents/US7194113?utm_source=gb-gplus-shareBrevet US7194113 - Capacitive biometric sensor
