Apparatus for detecting cutaneous imprints
An apparatus for detecting false fingerprints, comprising: an optical element having a detection surface on which at least one body is intended to be positioned, of which cutaneous imprints are intended to be detected, an anti-fake illuminator configured to generate at least one bright zone and at least one dark zone on said detection surface, an optical sensor arranged to capture light radiation reflected/diffused by said detection surface.
1. An apparatus for detecting false fingerprints, comprising:
an optical element having a detection surface on which at least one body is intended to be positioned, of which cutaneous imprints are intended to be detected;
an anti-fake illuminator configured to generate at least one bright zone and at least one dark zone on said detection surface;
an optical sensor arranged to capture light radiation reflected/diffused by said detection surface, wherein at least one bright zone and at least one dark zone are detectable on the optical sensor, corresponding to said at least one bright zone and to said at least one dark zone of said detection surface; and
a processing unit that receives signals coming from said optical sensor and arranged to compare the average light intensity in said at least one bright zone and the average light intensity in said at least one dark zone of the optical sensor with respective predetermined reference ranges, and wherein the processing unit is configured to recognize a true cutaneous imprint when the average light intensity in said at least one bright zone and the average light intensity in said at least one dark zone of the optical sensor are contained within respective predetermined reference ranges,
wherein said anti-fake illuminator emits light radiation with a wavelength between 380 and 750 nm.
2. An apparatus according to claim 1 , wherein the processing unit is also configured to recognize true cutaneous imprints when the ratio of the average light intensity of said at least one bright zone and the average light intensity of said at least one adjacent dark zone is comprised in a predetermined reference range.
3. An apparatus according to claim 1 , wherein said anti-fake illuminator emits light radiation with a wavelength between 400 and 420 nm.
4. An apparatus according to claim 1 , wherein at least one dark zone is included between two bright zones.
5. An apparatus according to claim 1 , wherein said anti-fake illuminator is arranged to form a plurality of bright zones and a plurality of dark zones on said detection surface, having the shape of parallel strips.
6. An apparatus according to claim 4 , wherein at least one dark zone is completely contained within the height of the scanning area of a phalanx of a finger.