Three-step scale and rotation invariant joint transform correlator

Sergio F. S. Santos; Armindo L. V. S. Lage; Augusto O. S. Gomes

doi:10.1117/12.187299

29 September 1994 Three-step scale and rotation invariant joint transform correlator

Sergio F. S. Santos, Armindo L. V. S. Lage, Augusto O. S. Gomes

Proceedings Volume 2297, Photonics for Processors, Neural Networks, and Memories II; (1994) https://doi.org/10.1117/12.187299
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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.

Citation Download Citation

Sergio F. S. Santos, Armindo L. V. S. Lage, and Augusto O. S. Gomes "Three-step scale and rotation invariant joint transform correlator", Proc. SPIE 2297, Photonics for Processors, Neural Networks, and Memories II, (29 September 1994); https://doi.org/10.1117/12.187299

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KEYWORDS

Computer generated holography

Optical correlators

Spatial light modulators

Joint transforms

Distortion

Video

Binary data

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