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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 26 — Sep. 10, 2010
  • pp: 4866–4873

Wavelength-compensated time-sequential multiplexed color joint transform correlator

P. García-Martínez, J. L. Martínez, M. M. Sánchez-López, and I. Moreno  »View Author Affiliations

Applied Optics, Vol. 49, Issue 26, pp. 4866-4873 (2010)

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We report a wavelength-compensated three-channel (RGB) joint transform correlator (JTC) for color pattern recognition using a ferroelectric liquid-crystal spatial light modulator (SLM) operating in binary pure phase modulation. We apply a previously reported time-multiplexing technique useful in creating wavelength-compensated diffraction patterns, based on the synchronization of properly scaled diffraction masks with the input wavelength selection obtained by applying a rotating RGB color-filter wheel to an Ar–Kr laser. The application of this technique to a JTC architecture permits real-time color object detection. In order to achieve a high light efficiency for the correlation process, we combine the design of zero-order joint power spectra in all color channels with the selection of a certain polarization configuration of the SLM, producing a broadband phase-only modulation. Excellent experimental results demonstrating color-object detection are provided.

© 2010 Optical Society of America

OCIS Codes
(070.4550) Fourier optics and signal processing : Correlators
(070.5010) Fourier optics and signal processing : Pattern recognition
(100.4550) Image processing : Correlators
(100.5010) Image processing : Pattern recognition
(070.6120) Fourier optics and signal processing : Spatial light modulators

ToC Category:
Fourier Optics and Signal Processing

Original Manuscript: May 4, 2010
Revised Manuscript: July 28, 2010
Manuscript Accepted: August 6, 2010
Published: September 2, 2010

Virtual Issues
Vol. 5, Iss. 13 Virtual Journal for Biomedical Optics

P. García-Martínez, J. L. Martínez, M. M. Sánchez-López, and I. Moreno, "Wavelength-compensated time-sequential multiplexed color joint transform correlator," Appl. Opt. 49, 4866-4873 (2010)

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