1 November 1991 Position-, scale-, and rotation-invariant photorefractive correlator
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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.
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Vincent Ryan, Vincent Ryan, Kenneth H. Fielding, Kenneth H. Fielding, } "Position-, scale-, and rotation-invariant photorefractive correlator", Proc. SPIE 1564, Optical Information Processing Systems and Architectures III, (1 November 1991); doi: 10.1117/12.49699; https://doi.org/10.1117/12.49699
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