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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 28 — Dec. 31, 2012
  • pp: 29854–29866

Method of synthesized phase objects for pattern recognition: matched filtering

Pavel V. Yezhov, Alexander V. Kuzmenko, Jin-Tae Kim, and Tatiana N. Smirnova  »View Author Affiliations

Optics Express, Vol. 20, Issue 28, pp. 29854-29866 (2012)

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To solve the pattern recognition problem, a method of synthesized phase objects is suggested. The essence of the suggested method is that synthesized phase objects are used instead of real amplitude objects. The former is object-dependent phase distributions calculated using the iterative Fourier-transform (IFT) algorithm. The method is experimentally studied with a Vander Lugt optical-digital 4F-correlator. We present the comparative analysis of recognition results using conventional and proposed methods, estimate the sensitivity of the latter to distortions of the structure of objects, and determine the applicability limits. It is demonstrated that the proposed method allows one: (а) to simplify the procedure of choice of recognition signs (criteria); (b) to obtain one-type δ-like recognition signals irrespective of the type of objects; (с) to improve signal-to-noise ratio (SNR) for correlation signals by 20 − 30 dB on average. The spatial separation of the Fourier-spectra of objects and optical noises of the correlator by means of the superposition of the phase grating on recognition objects at the recording of holographic filters and at the matched filtering has additionally improved SNR (>10 dB) for correlation signals. To introduce recognition objects in the correlator, we use a SLM LC-R 2500 device. Matched filters are recorded on a self-developing photopolymer.

© 2012 OSA

OCIS Codes
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(070.4550) Fourier optics and signal processing : Correlators
(070.5010) Fourier optics and signal processing : Pattern recognition
(070.6120) Fourier optics and signal processing : Spatial light modulators

ToC Category:
Fourier Optics and Signal Processing

Original Manuscript: November 29, 2012
Manuscript Accepted: December 2, 2012
Published: December 21, 2012

Pavel V. Yezhov, Alexander V. Kuzmenko, Jin-Tae Kim, and Tatiana N. Smirnova, "Method of synthesized phase objects for pattern recognition: matched filtering," Opt. Express 20, 29854-29866 (2012)

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