Optical Correlators: Vander Lugt

Authored by: Suganda Jutamulia

Encyclopedia of Optical and Photonic Engineering

Print publication date:  September  2015
Online publication date:  September  2015

Print ISBN: 9781439850978
eBook ISBN: 9781351247184
Adobe ISBN:

10.1081/E-EOE2-120009617

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Abstract

The Vander Lugt correlator is a coherent optical correlator, utilizing the Fourier transform property of a lens. The Vander Lugt correlation filter is a complex matched spatial filter, which is essentially an off-axis Fourier hologram. A correlator is naturally unable to recognize the searched objects when they are rotated or scaled. This entry discusses the basic methods for rotation-invariant and scale-invariant correlations.

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