Rotation-invariant phase-shifting joint transform correlator by use of circular harmonic expansion

Zhaoqi Wang; Jiuhong Guan; Guoguang Mu; Rulian Fu

doi:10.1117/1.1286417

1 October 2000 Rotation-invariant phase-shifting joint transform correlator by use of circular harmonic expansion

Zhaoqi Wang, Jiuhong Guan, Guoguang Mu, Rulian Fu

Optical Engineering, Vol. 39, Issue 10, (October 2000). https://doi.org/10.1117/1.1286417

The performance merits of the phase-shifting joint transform correlator (PSJTC) are evaluated based on the criteria of light efficiency and discrimination capability. The PSJTC is shown to possess much higher light efficiency (three orders of magnitude) and much better discrimination capability (three times with the selected images) than does the conventional joint transform correlator (JTC). The PSJTC is combined with the circular harmonic expansion to achieve a full rotationinvariant correlation with high light efficiency and high discrimination capability. Computer simulation results and 3-D computer plots are presented.

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Zhaoqi Wang, Jiuhong Guan, Guoguang Mu, and Rulian Fu "Rotation-invariant phase-shifting joint transform correlator by use of circular harmonic expansion," Optical Engineering 39(10), (1 October 2000). https://doi.org/10.1117/1.1286417

Published: 1 October 2000

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KEYWORDS

Optical correlators

Phase shifts

Joint transforms

Computer simulations

Fourier transforms

Phase only filters

Optical engineering

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