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Proceedings Paper

Rotationally Invariant Holographic Tracking System
Author(s): J. Lambert; T. H. Chao; G. Gheen; A. Johnston; H. K. Liu
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Paper Abstract

A multi-channel holographic correlator has been constructed which can identify and track objects of a given shape across the input field independent of their in-plane rotation. This system, derived from the classic Vander Lugt correlator, incorporates a hololens to store an array of matched spatial filters (MSFs) on thermoplastic film. Each member of the MSF array is generated from a different incrementally rotated version of the training object. Rotational invariant tracking is achieved through superposition of the corresponding array of the correlations in the output plane. Real time tracking is accomplished by utilizing a liquid crystal light valve (LCLV) illuminated with a CRT to process video input signals. The system can be programmed to recognize different objects by recording the MSF array on re-usable thermoplastic film. Discussion of the system architecture and laboratory results are presented.

Paper Details

Date Published: 29 June 1989
PDF: 12 pages
Proc. SPIE 1053, Optical Pattern Recognition, (29 June 1989); doi: 10.1117/12.951527
Show Author Affiliations
J. Lambert, Jet Propulsion Lab (United States)
T. H. Chao, Jet Propulsion Lab (United States)
G. Gheen, Jet Propulsion Lab (United States)
A. Johnston, Jet Propulsion Lab (United States)
H. K. Liu, Jet Propulsion Lab (United States)

Published in SPIE Proceedings Vol. 1053:
Optical Pattern Recognition
Hua-Kuang Liu, Editor(s)

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