5 May 2009 Fingerprint scanner using digital interference holography
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Abstract
We present three-dimensional imaging of artificial fingerprints using the Digital Interference Holography (DIH) scanner. DIH is based on a multiwavelength optical sensing technique that can be used to build holographically the three dimensional structure of the fingerprints. Many holograms (~50) were acquired by a CCD camera by scanning a range of wavelengths. Each hologram was numerically reconstructed and then superposed yielding tomographic images which represented the artificial fingerprint structure. The axial resolution is a parameter that depends on the wavelength scanning range and is about 5 μm. The light source was a solid state pumped dye laser with a tunable wavelength range of 550 nm to 600 nm. Holograms were captured by a monochrome CCD camera (Sony XC-ST50, with 780 × 640 pixels and a pixel size of ~ 9 μm). An image acquisition board (NI IMAQ PCI-1407) digitized the image with 8 bit resolution. All software was developed in house with the NI LabView. We used a Michelson interferometer in a backscattering geometry and the reconstruction of the optical field was done using the angular spectrum algorithm. Our goal is to identify and quantify, Level 1 (pattern), Level 2 (minutia points), and Level 3 (ridge contours) features from the amplitude images, using the DIH technique and fingerprints recognition. The results could be used in the two fingerprint matching phases, identification and verification.
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Mariana C. Potcoava, Mariana C. Potcoava, Myung K. Kim, Myung K. Kim, } "Fingerprint scanner using digital interference holography", Proc. SPIE 7306, Optics and Photonics in Global Homeland Security V and Biometric Technology for Human Identification VI, 730627 (5 May 2009); doi: 10.1117/12.818276; https://doi.org/10.1117/12.818276
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