Abstract

As is known, a coherent optical data processing system can be used to perform convolution and correlation with ease. Recently it has been shown that the system with diffraction gratings in the spatial filtering plane can also add or subtract complex patterns displayed symmetrically in the input plane. A method is described here for synthesizing a spatial filter so that the coherent system can perform both correlation and subtraction simultaneously in real time. As a particular application of this technique, we present results of using such filters in optical feature extraction.

© 1971 Optical Society of America

Combined Beam Forming and Cross Correlation of Broadband Signals from a Multidimensional Array Using Coherent Optics

R. E. Williams and K. von Bieren
Appl. Opt. 10(6) 1386-1392 (1971)

Lensless Holographic Recognition of Spatially Incoherent Patterns in Real Time

W. T. Maloney
Appl. Opt. 10(9) 2127-2131 (1971)

Holographic Subtraction

K. Bromley, M. A. Monahan, J. F. Bryant, and B. J. Thompson
Appl. Opt. 10(1) 174-181 (1971)

Spatial Differentiation and Integration by Coherent Optical-Correlation Method

S. K. Yao and S. H. Lee
J. Opt. Soc. Am. 61(4) 474-477 (1971)

New Multichannel Optical Correlator

G. J. M. Aitken and L. Wang
Appl. Opt. 10(11) 2476-2481 (1971)