Method and system for contactless 3D fingerprint image acquisition

A non-contact 3D fingerprint capturing apparatus comprising:

• a housing;
• and
• a fingerprint reader disposed in the housing, wherein the fingerprint reader comprises a fingerprint capturing module, a positioning module, and a first control module, the first control module being disposed on a circuit board, and wherein the positioning module is configured to cast light to a first position point on a finger object, wherein
• the fingerprint capturing module is configured to
• receive light reflected from the first position point,
• convert an optical signal into an electrical signal, and
• transmit the electrical signal to the first control module,
• the first control module is configured to determine according to the electrical signal, whether the first position point is a standard point, the standard point being an aperture with a diameter less than a first threshold and an illumination intensity greater than a second threshold, wherein
• in response to the first position being successfully determined as the standard point, the fingerprint capturing module is further configured to capture fingerprint images from multiple directions, and transmit the fingerprint images to the first control module, and wherein
• the first control module creates a 3D fingerprint image according to the fingerprint images, and wherein the control module in response to the first position point being unsuccessfully determined as the standard point, provides a voice prompt to a user to adjust a finger position.