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Proceedings Paper

Three-step scale and rotation invariant joint transform correlator
Author(s): Sergio F. S. Santos; Armindo L. V. S. Lage; Augusto O. S. Gomes
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Paper Abstract

An experimental investigation of the scale and rotation invariant joint transform correlator (SRIJTC) is presented. The SRIJTC is a three-step algorithm, one more than the conventional JTC, and where in the first step we perform a logarithm-polar coordinate transformation to achieve scale and rotation invariance. The mask for the logarithm-polar coordinate transformation is obtained with a Lee's binary interferogram computer generated hologram with a mapping of 4(pi) . The product between the coordinate transformation mask and the input signal is made digitally and displayed on a liquid crystal television to perform the logarithm-polar coordinate transformation. The optical setup used to obtain coordinate transformation is the same that perform the JTC leading to a three-step JTC invariant to scale and rotation.

Paper Details

Date Published: 29 September 1994
PDF: 7 pages
Proc. SPIE 2297, Photonics for Processors, Neural Networks, and Memories II, (29 September 1994); doi: 10.1117/12.187299
Show Author Affiliations
Sergio F. S. Santos, Univ. do Porto (Portugal)
Armindo L. V. S. Lage, Univ. do Porto (Portugal)
Augusto O. S. Gomes, Univ. do Porto (Portugal)


Published in SPIE Proceedings Vol. 2297:
Photonics for Processors, Neural Networks, and Memories II
Joseph L. Horner; Bahram Javidi; Stephen T. Kowel, Editor(s)

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