Wavelength-compensated time-sequential multiplexed color joint transform correlator
Applied Optics, Vol. 49, Issue 26, pp. 4866-4873 (2010)
http://dx.doi.org/10.1364/AO.49.004866
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Abstract
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
History
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
Citation
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)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-49-26-4866
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