Abstract: A method for acquiring the image of an object, such as a part of a hand, that is rolled on a detection surface. The method comprises acquiring the image on an area on which the object is rolled that is located within the detection surface. The method comprises: detecting an initial position of the object positioned on the detection surface; and locating the rolling area within the detection surface as a function of the initial position in which the object has been positioned on the detection surface.

Abstract: A method for acquiring the image of an object, such as a part of a hand (F), that is rolled on a detection surface (12). The method comprises acquiring the image on an area (140) on which the object is rolled that is located within the detection surface (12). The method comprises: —detecting (100) an initial position (P) of the object (F) positioned on the detection surface (12); and —locating (102) the rolling area (140) within the detection surface (12) as a function of the initial position (P) in which the object (F) has been positioned on the detection surface (12).

Abstract: The method aims at identifying a fake element (F1) reproducing a fake skin print positioned on the detection surface (13) of an optical device for detecting skin prints such as fingerprints. The method provides for sending (14) towards the abovementioned detection surface (13) an illumination beam (14) to be back-scattered and propagate through the fake element (F1) bearing the fake print. The beam in question is a shielded beam including an illuminated region (22) and a shielded region (23). A sensor (16) captures the shielded illumination beam after the back-scattering, generating a signal indicating the dimension (x0, x0?) of the transition region (24) between the illuminated region (22) and the shielded region (23) present in the shielded beam after the back-scattering. The possible presence of a fake element (F1) reproducing a fake skin print is identified when the abovementioned transition region (24) has a dimension larger than a given reference value (x0).

Abstract: The method aims at identifying a fake element (F1) reproducing a fake skin print positioned on the detection surface (13) of an optical device for detecting skin prints such as fingerprints. The method provides for sending (14) towards the abovementioned detection surface (13) an illumination beam (14) to be back-scattered and propagate through the fake element (F1) bearing the fake print. The beam in question is a shielded beam including an illuminated region (22) and a shielded region (23). A sensor (16) captures the shielded illumination beam after the back-scattering, generating a signal indicating the dimension (x0, x0?) of the transition region (24) between the illuminated region (22) and the shielded region (23) present in the shielded beam after the back-scattering. The possible presence of a fake element (F1) reproducing a fake skin print is identified when the abovementioned transition region (24) has a dimension larger than a given reference value (x0).