We present an optical design for a fingerprint scanner that addresses the challenges involved in capturing the prints of rolling fingers. A rolling fingerprint scanner requires a high performance distortion free system with big object space numerical aperture (0.022) and larger capture size (40 × 40 (mm)). We show how these requirements can be achieved with the approach of optical and computational hybrid distortion correction. In addition, dark background illumination is utilized to increase fingerprint contrast.
© 2012 Chinese Optics Letters
Optical Design and Fabrication
Wei Huang, "Optical design of high performance f ingerprint scanner with large capture size," Chin. Opt. Lett. 10, 122201-122201 (2012)