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Optical Engineering

Invariant joint transform correlator using coordinate transformation
Author(s): Jihong Feng; Minxian Wu; Guofan Jin
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Paper Abstract

A joint transform correlator incorporating the coordinate transformation technique is proposed to perform invariant pattern recognition. Instead of an input image or its Fourier transform intensity being mapped, the Fourier transform of the input image is directly transformed from rectangular into logarithmic-polar coordinates. All information is saved, and as a result, multiple objects can be processed simultaneously. A binary optical component is designed and fabricated to perform coordinate transformation with high efficiency. Further, a Dammann grating is applied to generate a two-periodicity mapped reference image to overcome correlation peak dropping due to the cyclic shift of the mapped image along the ? axis when the target is rotated.

Paper Details

Date Published: 1 December 1996
PDF: 8 pages
Opt. Eng. 35(12) doi: 10.1117/1.601098
Published in: Optical Engineering Volume 35, Issue 12
Show Author Affiliations
Jihong Feng, Tsinghua Univ. (China)
Minxian Wu, Tsinghua Univ. (China)
Guofan Jin, Tsinghua Univ. (China)


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