Rotation- and scale-invariant joint transform correlator using FLC-SLMs

Yasuyuki Mitsuoka; Tadao Iwaki; Shuhei Yamamoto

doi:10.1117/12.49715

1 November 1991 Rotation- and scale-invariant joint transform correlator using FLC-SLMs

Yasuyuki Mitsuoka, Tadao Iwaki, Shuhei Yamamoto

Proceedings Volume 1564, Optical Information Processing Systems and Architectures III; (1991) https://doi.org/10.1117/12.49715
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

A rotation and scale invariant joint transform correlator is described. The polar-logarithmic coordinate transformation is used as a preprocessing of input images. The resultant coordinate transformed images are interfaced to a joint transform correlator. The use of optically addressed ferroelectric liquid crystal spatial light modulators at the coordinate transform plane and at the Fourier plane allows data to be processed faster than video rate and gives the characteristics of a binary joint transform correlator. The rotation and scale invariance of the correlator is demonstrated experimentally.

Citation Download Citation

Yasuyuki Mitsuoka, Tadao Iwaki, and Shuhei Yamamoto "Rotation- and scale-invariant joint transform correlator using FLC-SLMs", Proc. SPIE 1564, Optical Information Processing Systems and Architectures III, (1 November 1991); https://doi.org/10.1117/12.49715

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