24 May 2000 Optical correlator for textile web defect detection
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Proceedings Volume 4089, Optics in Computing 2000; (2000) https://doi.org/10.1117/12.386806
Event: 2000 International Topical Meeting on Optics in Computing (OC2000), 2000, Quebec City, Canada
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.
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Nathalie Blanchard, Nathalie Blanchard, Donald Prevost, Donald Prevost, Yunlong Sheng, Yunlong Sheng, } "Optical correlator for textile web defect detection", Proc. SPIE 4089, Optics in Computing 2000, (24 May 2000); doi: 10.1117/12.386806; https://doi.org/10.1117/12.386806

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