![]() Casio Alps ElectricĪs well as Digital Persona with the Firefly Digital Persona Firefly Cecrop seems to have abandonned this device Kinetic Sciences Paper describing the sensor Cecrop/SannaedleĬasio + Alps Electric uses a roller with the sensor inside. Kinetic Sciences and Cecrop/Sannaedle have proposed sweep optical sensors based on this principle. Nagoya University uses a micro-collimator instead of the fiber optic, enabling direct fingerprint comparison. Generally, one fingerprint is taken at a time, but some devices are able to acquire several fingers at a time. Here is the example of the Compaq fingerprint reader (CMOS camera, around 2000). Optical readers -Reflection Many companies are offering such devices, this is a common technology. ![]() (FTIR: frustrated total internal reflection). The finger is illuminated from one side with a LED while the other side transmits the image through a lens to a camera. Reflection The oldest 'live-scan' readers use frustrated refraction over a glass prism (when the skin touches the glass, the light is not reflected but absorbed). Ink and paper are the tried-and-true way to take fingerprints, but technology has found ways to eliminate smudges and ink stains. Reflection Transmission Sweep, sweep with a roller Touchless TFT Fingerprint sensing techniques 0920 2007 Biometrics Tech.
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