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Proceedings Paper

Optical correlator for textile web defect detection
Author(s): Nathalie Blanchard; Donald Prevost; Yunlong Sheng
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Paper Abstract

Cost-effective optical correlators are now available for industrial applications. One such application field is the real-time automatic inspection of textile web, in which the high data throughput of the optical correlator over-performs that of the electronic computer. Two approaches for defect enhancement using of wavelet and Wiener filters are proposed. The band-pass wavelet filter is designed to give higher weights in the frequency band, where the energy of defect is higher than that of the web, and to suppress the zero, first and all higher diffracted orders. The Wiener filters are designed based on an average defect shape, with the web texture considered as noise. Using the technique developed at INO (National Optics Institute), a set up of the Vander Lugt type correlator demonstrates experimentally the relevancy of the algorithms. Simulation and optical results are presented.

Paper Details

Date Published: 24 May 2000
PDF: 9 pages
Proc. SPIE 4089, Optics in Computing 2000, (24 May 2000); doi: 10.1117/12.386806
Show Author Affiliations
Nathalie Blanchard, National Institute of Optics and COPL/Univ. Laval (Canada)
Donald Prevost, National Institute of Optics (Canada)
Yunlong Sheng, COPL/Univ. Laval (Canada)


Published in SPIE Proceedings Vol. 4089:
Optics in Computing 2000
Roger A. Lessard; Tigran V. Galstian, Editor(s)

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