In this paper, we proposed a parallel phase-only lensless optical correlator based on two pieces of Liquid Crystal on Silicon Spatial Light Modulators. Phase Fresnel Lens Array and specialized grating are implemented to realize multi-channel and multiplexed LOC. Experimental results of Chinese characters’ recognitions are given as demonstration of proposed technique. High uniformity of processing channels has been verified by autocorrelation process of four same Chinese characters. The technique is programmable and adjustment of optical path could be realized without changing of optical setup. The implementations could be performed on the same configuration as single channel optical correlator without mechanical alternation.

© 2011 OSA

1. F. T. S. Yu and X. J. Lu, “Real-time optical scanning correlator,” Appl. Opt. 23(18), 3109–3116 (1984). [CrossRef] [PubMed]
2. F. T. S. Yu and M. S. Dymek, “Optical information parallel processing: a technique,” Appl. Opt. 20(8), 1450–1453 (1981). [CrossRef] [PubMed]
3. D. A. Gregory and H. K. Liu, “Large-memory real-time multichannel multiplexed pattern recognition,” Appl. Opt. 23(24), 4560–4570 (1984). [CrossRef] [PubMed]
4. H. K. Liu and J. G. Duthie, “Real-time screen-aided multiple-image optical holographic matched-filter correlator,” Appl. Opt. 21(18), 3278–3286 (1982). [CrossRef] [PubMed]
5. T. H. Chao and H. K. Liu, “Real-time optical holographic tracking of multiple objects,” Appl. Opt. 28(2), 226–231 (1989). [CrossRef] [PubMed]
6. S. K. Case, “Pattern recognition with wavelength-multiplexed filters,” Appl. Opt. 18(12), 1890–1894 (1979). [CrossRef] [PubMed]
7. T. H. Chao and M. Chen, “Pattern recognition with a wavelength-angle multiplexed optical scanning correlator,” Opt. Eng. 25, 828–833 (1986).
8. C. F. Hester and D. Casasent, “Multivariant technique for multiclass pattern recognition,” Appl. Opt. 19(11), 1758–1761 (1980). [CrossRef] [PubMed]
9. G. F. Schils and D. W. Sweeney, “Rotationally invariant correlation filtering for multiple images,” J. Opt. Soc. Am. A 3(7), 902–908 (1986). [CrossRef]
10. M. Villarreal, C. Iemmi, and J. Campos, “Parallel classification of multiple objects using a phase-only multichannel optical correlator,” Opt. Eng. 42(8), 2354–2361 (2003). [CrossRef]
11. N. Fukuchi, T. Inoue, H. Toyoda, and T. Hara, “Lensless Vanderlugt optical correlator using two phase-only spatial light modulators,” Chin. Opt. Lett. 7(12), 1131–1133 (2009). [CrossRef]
12. X. Zeng, J. Bai, C. Hou, and G. Yang, “Compact optical correlator based on one phase-only spatial light modulator,” Opt. Lett. 36(8), 1383–1385 (2011). [CrossRef] [PubMed]
13. R. W. Gerchberg and W. O. Saxton, “A practical algorithm for the determination of the phase from image and diffraction plane pictures,” Optik (Stuttg.) 35, 227–246 (1972).

Appl. Opt.

• F. T. S. Yu and X. J. Lu, “Real-time optical scanning correlator,” Appl. Opt. 23(18), 3109–3116 (1984). [CrossRef] [PubMed]
• F. T. S. Yu and M. S. Dymek, “Optical information parallel processing: a technique,” Appl. Opt. 20(8), 1450–1453 (1981). [CrossRef] [PubMed]
• D. A. Gregory and H. K. Liu, “Large-memory real-time multichannel multiplexed pattern recognition,” Appl. Opt. 23(24), 4560–4570 (1984). [CrossRef] [PubMed]
• H. K. Liu and J. G. Duthie, “Real-time screen-aided multiple-image optical holographic matched-filter correlator,” Appl. Opt. 21(18), 3278–3286 (1982). [CrossRef] [PubMed]
• T. H. Chao and H. K. Liu, “Real-time optical holographic tracking of multiple objects,” Appl. Opt. 28(2), 226–231 (1989). [CrossRef] [PubMed]
• S. K. Case, “Pattern recognition with wavelength-multiplexed filters,” Appl. Opt. 18(12), 1890–1894 (1979). [CrossRef] [PubMed]
• C. F. Hester and D. Casasent, “Multivariant technique for multiclass pattern recognition,” Appl. Opt. 19(11), 1758–1761 (1980). [CrossRef] [PubMed]

Chin. Opt. Lett.

• N. Fukuchi, T. Inoue, H. Toyoda, and T. Hara, “Lensless Vanderlugt optical correlator using two phase-only spatial light modulators,” Chin. Opt. Lett. 7(12), 1131–1133 (2009). [CrossRef]

J. Opt. Soc. Am. A

• G. F. Schils and D. W. Sweeney, “Rotationally invariant correlation filtering for multiple images,” J. Opt. Soc. Am. A 3(7), 902–908 (1986). [CrossRef]

Opt. Eng.

• M. Villarreal, C. Iemmi, and J. Campos, “Parallel classification of multiple objects using a phase-only multichannel optical correlator,” Opt. Eng. 42(8), 2354–2361 (2003). [CrossRef]
• T. H. Chao and M. Chen, “Pattern recognition with a wavelength-angle multiplexed optical scanning correlator,” Opt. Eng. 25, 828–833 (1986).

Opt. Lett.

• X. Zeng, J. Bai, C. Hou, and G. Yang, “Compact optical correlator based on one phase-only spatial light modulator,” Opt. Lett. 36(8), 1383–1385 (2011). [CrossRef] [PubMed]

Optik (Stuttg.)

• R. W. Gerchberg and W. O. Saxton, “A practical algorithm for the determination of the phase from image and diffraction plane pictures,” Optik (Stuttg.) 35, 227–246 (1972).

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