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Rotation- and scale-invariant feature extraction by a diffractive optical inner-product transform

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Abstract

A diffractive optical element that is capable of extracting rotation- and scale-invariant features from input images is presented. The diffractive optical element performs an inner product between the input image and a set of basis functions. This set of basis functions is derived from that used in the Fourier–Mellin transform. Simulated results from scaled and rotated versions of two input images are presented.

© 1996 Optical Society of America

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