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Proceedings Paper

Position-, scale-, and rotation-invariant photorefractive correlator
Author(s): Vincent Ryan; Kenneth H. Fielding
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Paper Abstract

A photorefractive optical correlator capable of recognizing objects regardless of their position, rotation, or scaling in Cartesian space is described and demonstrated. This work is a combination of two well-established ideas. photorefractive correlation is realized using degenerate four-wave mixing in bismuth silicon oxide (BSO). position, in-plane rotation, and scale invariance are obtained using a Fourier plane coordinate transformation. Investigation of the sensitivity to rotation of an image in Cartesian coordinates is reported. In comparison, effective correlation results demonstrating the invariance of the coordinate transformation representation are provided.

Paper Details

Date Published: 1 November 1991
PDF: 12 pages
Proc. SPIE 1564, Optical Information Processing Systems and Architectures III, (1 November 1991); doi: 10.1117/12.49699
Show Author Affiliations
Vincent Ryan, Tufts Univ. (United States)
Kenneth H. Fielding, Rome Lab. (United States)


Published in SPIE Proceedings Vol. 1564:
Optical Information Processing Systems and Architectures III
Bahram Javidi, Editor(s)

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