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Proceedings Paper

Optimizing the discrimination capabilities of the joint transform correlator for a product validation application
Author(s): Nicholas J. New; Tim D. Wilkinson; William A. Crossland
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Paper Abstract

The implementation of a compact Joint Transform Correlator designed for use in a production line validation system is presented. The application demands that the system is capable of capturing and examining printed product codes. The effects of applying non-linear processing techniques on the Input Plane and Joint Power Spectrum stages of the system are detailed, including morphological filtering. A subtraction technique is presented to further remove noise and unwanted cross-correlation terms from the Joint Power Spectrum. Installation of a CMOS camera into the system to replace the currently used CCD model is proposed offering a vastly expanded dynamic range. A technique for allowing the use of poor quality spectra is also presented which removes some of the sensitivity to noise and imperfections in the JPS.

Paper Details

Date Published: 31 March 2000
PDF: 12 pages
Proc. SPIE 4043, Optical Pattern Recognition XI, (31 March 2000); doi: 10.1117/12.381586
Show Author Affiliations
Nicholas J. New, Univ. of Cambridge (United Kingdom)
Tim D. Wilkinson, Univ. of Cambridge (United Kingdom)
William A. Crossland, Univ. of Cambridge (United Kingdom)


Published in SPIE Proceedings Vol. 4043:
Optical Pattern Recognition XI
David P. Casasent; Tien-Hsin Chao, Editor(s)

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