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Proceedings Paper

An Optical Image Correlator For Robotic Applications
Author(s): P. S. Cawte; I. R. Cooper; G. G. Gibbons; S. C. Webster; F. Dubois; M. Buchel; J. M. Brodin; J. Ph. Schnell; B. Loiseaux
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Paper Abstract

The goal of cost effective, high performance optical systems capable of pattern matching tasks has fuelled research for over two decades. It is only recently with the introduction of novel optical/electronic architectures that such systems are becoming viable. Although conceptually elegant, the single output from an optical correlator is of restricted application due to its sensitivity to image distortions. A multichannel hybrid optical/electronic architecture has therefore been devised, exhibiting greatly enhanced flexibility and performance. This hybrid processor is being used in conjunction with a robotic handling system as part of an ESPRIT programme. The video signal from a robot's TV camera is relayed to an electrically addressed spatial light modulator in the processor. This input image is then replicated optically and fed into each of the system's parallel channels where it is cross-correlated with a set of differing reference patterns. The multiple correlation signals are detected and compiled into an electronic descriptor code. A 'Euclidean' search through a look-up table of codes then extracts object identification and rotation. Scale information and out-of-class recognition is also possible since the system can be taught to memorise new codes in real time.

Paper Details

Date Published: 25 October 1989
PDF: 8 pages
Proc. SPIE 1134, Optical Pattern Recognition II, (25 October 1989); doi: 10.1117/12.961634
Show Author Affiliations
P. S. Cawte, GEC Hirst Research Centre (UK)
I. R. Cooper, GEC Hirst Research Centre (UK)
G. G. Gibbons, GEC Hirst Research Centre (UK)
S. C. Webster, GEC Hirst Research Centre (UK)
F. Dubois, Universite Libre de Bruxelles (Belgium)
M. Buchel, KRUPP Forschungsinstitut (Germany)
J. M. Brodin, AVG Centre Gallieni (France)
J. Ph. Schnell, Thomson CSF (France)
B. Loiseaux, Thomson CSF (France)

Published in SPIE Proceedings Vol. 1134:
Optical Pattern Recognition II
H. John Caulfield, Editor(s)

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