Abstract
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
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