![]() However, regardless of the approach, fingerprints are stored in a secure encrypted format, which is virtually impossible to reverse engineer, i.e. ![]() Despite the fundamental differences in the sensing approaches, the main objective of a fingerprint scanner is to acquire a fingerprint image and provide it for enrollment or matching, as the case is.ĭifferent fingerprint solutions may leverage different approaches to store fingerprints. Reflected ultrasonic waves from ridges have a slight difference from reflected waves from valleys. More security-oriented implementations may use ultrasonic sound waves as a sensing mechanism in which, sound waves are projected on the finger skin and the reflected waves are detected to create a fingerprint image. Capacitive fingerprint scanners, on the other hand, use a grid of tiny capacitors to capture the ridge pattern image. For example, optical fingerprint scanners make use of visible light to capture fingerprint images with a digital camera. ![]() Fingerprint biometric devices may leverage different sensing technologies to capture the image. All types of biometric fingerprint scanners, regardless of the type and technology used, work by capturing a fingerprint image, extracting unique features, and comparing them with an already registered template.
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