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Dynamic binary fourier filtered imaging system

  • US 4,370,024 A
  • Filed: 05/06/1980
  • Issued: 01/25/1983
  • Est. Priority Date: 05/06/1980
  • Status: Expired due to Term
First Claim
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1. An apparatus for selectively and dynamically filtering the spatial frequencies in a pattern, comprising:

  • a means for generating a collimated beam of coherent light;

    a means for creating a diffraction pattern in said beam;

    a Fourier transform lens system in the path of said patterned beam;

    a dynamic means for spatially and temporally varying the reflective characteristics of a surface at the focal plane of said Fourier transform lens system, said dynamic means having a continuously reflective area at the point corresponding to zero spatial frequency; and

    a means for redirecting the light, reflected off the surface of said dynamic means, onto an image plane.

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