Position-, scale-, and rotation-invariant photorefractive correlator

Vincent Ryan; Kenneth H. Fielding

doi:10.1117/12.49699

1 November 1991 Position-, scale-, and rotation-invariant photorefractive correlator

Vincent Ryan, Kenneth H. Fielding

Proceedings Volume 1564, Optical Information Processing Systems and Architectures III; (1991) https://doi.org/10.1117/12.49699
Event: San Diego, '91, 1991, San Diego, CA, United States

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.

Citation Download Citation

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available