Abstract
We describe a new method for use with multiple-input single-output (MISO) Fourier filtering systems based on a holographic optical system. The spatial filter is located in the reference beam and the object beam contains the input image followed by a Fourier transform lens. A bacteriorhodopsin film is used to record the hologram resulting from the interfering waves. When reconstructed with the reference wave, the hologram will produce a diffraction pattern which becomes the output of the filtering system after passing through another Fourier transform lens. Discrete spatial filters can be placed in a set of different reference beams that share the same output path to form the MISO Fourier filtering system. The filters can be changed simply by switching from one reference beam to another. It is remarked that the high-resolution holographic spatial filters are more versatile than the conventionally used spatial light modulator for such applications.
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