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Appl Opt. 1966 Jun 1;5(6):967-9. doi: 10.1364/AO.5.000967.

Complex spatial filtering with binary masks.

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  • 1The IBM Corporation, ResearchDivision, San Jose, California 95114, USA.


Usually a hologram is produced by means of an interference experiment. Here, however, we let a computer- guided plotter draw the hologram. The plot, which has to be minified and recorded on film, contains no grey, only binary transmittance values. Our binary holograms yield reconstructed images of a quality equal to that of images obtained from usual holograms of comparable dimensions. When a Fourier hologram is inserted into the Fraunhofer plane of a coherent image forming system, it acts as a special type of a spatial filter, a so-called optical matched filter. Our binary matched filter is suitable for optical character recognition, the same as the usual optical matched filter introduced by Vander Lugt.

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