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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 5, Iss. 8 — Jun. 8, 2010

Point spread function engineering for iris recognition system design

Amit Ashok and Mark A. Neifeld  »View Author Affiliations

Applied Optics, Vol. 49, Issue 10, pp. B26-B39 (2010)

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Undersampling in the detector array degrades the performance of iris-recognition imaging systems. We find that an undersampling of 8 × 8 reduces the iris-recognition performance by nearly a factor of 4 (on CASIA iris database), as measured by the false rejection ratio (FRR) metric. We employ optical point spread function (PSF) engineering via a Zernike phase mask in conjunction with multiple sub pixel shifted image measurements (frames) to mitigate the effect of undersampling. A task-specific optimization framework is used to engineer the optical PSF and optimize the postprocessing parameters to minimize the FRR. The optimized Zernike phase enhanced lens (ZPEL) imager design with one frame yields an improvement of nearly 33% relative to a thin observation module by bounded optics (TOMBO) imager with one frame. With four frames the optimized ZPEL imager achieves a FRR equal to that of the conventional imager without undersampling. Further, the ZPEL imager design using 16 frames yields a FRR that is actually 15% lower than that obtained with the conventional imager without undersampling.

© 2010 Optical Society of America

OCIS Codes
(070.5010) Fourier optics and signal processing : Pattern recognition
(110.1758) Imaging systems : Computational imaging
(100.3008) Image processing : Image recognition, algorithms and filters
(100.4995) Image processing : Pattern recognition, metrics

Original Manuscript: September 3, 2009
Revised Manuscript: January 15, 2010
Manuscript Accepted: January 22, 2010
Published: February 19, 2010

Virtual Issues
Vol. 5, Iss. 8 Virtual Journal for Biomedical Optics

Amit Ashok and Mark A. Neifeld, "Point spread function engineering for iris recognition system design," Appl. Opt. 49, B26-B39 (2010)

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