Experimental study of the different kind of filters used in correlation filtering

C. Vazquez

doi:10.1117/12.2308585

26 July 1993 Experimental study of the different kind of filters used in correlation filtering

C. Vazquez

Author Affiliations +

Proceedings Volume 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology; 19834M (1993) https://doi.org/10.1117/12.2308585
Event: 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1993, Budapest, Hungary

Abstract

An experimental comparative study of different filters used in correlation filtering technique for pattern recognition is presented. One of the main problems related to this technique are the low luminous level of the correlation signal and its width. So, the experimental study has been performed in order to obtain the best combination width - luminous level of the correlation signal. The narrowest signal is obtained using quasi-inverse filters but the diffraction efficiency is very low. These quasi-inverse filters have been obtained, in a first step, using photographic emulsions by bleaching methods, including recent post-heat treatment and S.H.S. G. technique. In a second step, the quasi-inverse filters are recorded on dichromated gelatin and then the efficiency increases and the width of the correlation signals decreases with respect to the previous cases. The study has been partly performed when the signal to be detected a) lies on a uniform background; b) is superposed to a speckle field; and c) is disturbed by the presence of additive gaussian noise.

Citation Download Citation

C. Vazquez "Experimental study of the different kind of filters used in correlation filtering", Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 19834M (26 July 1993); https://doi.org/10.1117/12.2308585

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