[OPTICAL REVIEW Vol. 3, No. 6B (1996) 505-511]
Effect of Dynamic Range Input Image on Performance of Binary Subtracted Joint Transform Correlator
Takumi MINEMOTO,1 Yukihisa OSUGI,2 Hiromitsu MIZUKAWA1 and Junko ISHIKAWA1
1Department of Computer and Systems Engineering, Kobe University, Rokkodai, Nada, Kobe, 657 Japan, 2Corporated Research and Development Group, NGK Insulators, Ltd., Suda, Mizuho, Nagoya, 467 Japan
(Received May 17, 1996; Accepted August 19, 1996)
A demand for the dynamic range of input images in the binary subtracted joint transform correlator was studied by computer simulations using input scenes containing multiple halftone images of human faces. To realize good discriminability the correlator requires use of an image-conversion subsystem with a dynamic range larger than 50:1 and 16:1 in amplitude for input scenes having (1) a reference image and many target images and (2) a target image and many reference images, respectively.
Key words : pattern recognition, joint transform correlator, optical information processing, spatial light modulator, Fourier transformation