A joint transform correlator has been constructed by a spatial light modulator that uses the electroabsorption effect of GaAs crystal and operates at a high frame rate a TV camera with logarithmic response and a personal computer. In the system, logarithmic values of joint power spectra generated in an optical system were electrically digitized and inverse-Fourier transformed. The system has accomplished the operation of correlation with a throughput time smaller than 10 ms per an input image.
© 2003 Optical Society of America
(100.1160) Image processing : Analog optical image processing
(100.2000) Image processing : Digital image processing
(100.4550) Image processing : Correlators
(100.5010) Image processing : Pattern recognition
(230.6120) Optical devices : Spatial light modulators
Taketsugu Yao and Takumi Minemoto, "Hybrid Nonlinear Joint Transform Correlator that Operates at a High Frame Rate," Appl. Opt. 42, 5290-5301 (2003)