[OPTICAL REVIEW Vol. 1, No. 2 (1994) 166-169]

Real Time Optical Correlator with a Bi12SiO20 Crystal

Katsuyuki OKADA, Koji ITO, Toshio HONDA and Jumpei TSUJIUCHI

Department of Image Science, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba, 263 Japan

(Accepted September 12, 1994)

In this paper we propose a new design of a joint transform correlator in which two transform lenses are used to minimize the influence of their aberration, and a magnification lens is used to make the optics compact. Experimental results show the correlator can be used to recognize characters and/or half tone images in real time.

Key words : correlator, photo-refractive crystal, joint transform correlator, optical computing, image recognition