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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 14 — May. 10, 2012
  • pp: 2638–2650

Spectral optimized asymmetric segmented phase-only correlation filter

I. Leonard, A. Alfalou, and C. Brosseau  »View Author Affiliations


Applied Optics, Vol. 51, Issue 14, pp. 2638-2650 (2012)
http://dx.doi.org/10.1364/AO.51.002638


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Abstract

We suggest a new type of optimized composite filter, i.e., the asymmetric segmented phase-only filter (ASPOF), for improving the effectiveness of a VanderLugt correlator (VLC) when used for face identification. Basically, it consists in merging several reference images after application of a specific spectral optimization method. After segmentation of the spectral filter plane to several areas, each area is assigned to a single winner reference according to a new optimized criterion. The point of the paper is to show that this method offers a significant performance improvement on standard composite filters for face identification. We first briefly revisit composite filters [adapted, phase-only, inverse, compromise optimal, segmented, minimum average correlation energy, optimal trade-off maximum average correlation, and amplitude-modulated phase-only (AMPOF)], which are tools of choice for face recognition based on correlation techniques, and compare their performances with those of the ASPOF. We illustrate some of the drawbacks of current filters for several binary and grayscale image identifications. Next, we describe the optimization steps and introduce the ASPOF that can overcome these technical issues to improve the quality and the reliability of the correlation-based decision. We derive performance measures, i.e., PCE values and receiver operating characteristic curves, to confirm consistency of the results. We numerically find that this filter increases the recognition rate and decreases the false alarm rate. The results show that the discrimination of the ASPOF is comparable to that of the AMPOF, but the ASPOF is more robust than the trade-off maximum average correlation height against rotation and various types of noise sources. Our method has several features that make it amenable to experimental implementation using a VLC.

© 2012 Optical Society of America

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(100.5010) Image processing : Pattern recognition
(100.5090) Image processing : Phase-only filters
(100.3008) Image processing : Image recognition, algorithms and filters

ToC Category:
Image Processing

History
Original Manuscript: September 26, 2011
Revised Manuscript: January 21, 2012
Manuscript Accepted: January 27, 2012
Published: May 8, 2012

Citation
I. Leonard, A. Alfalou, and C. Brosseau, "Spectral optimized asymmetric segmented phase-only correlation filter," Appl. Opt. 51, 2638-2650 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-14-2638


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