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Optical correlator

  • US 5,150,229 A
  • Filed: 09/07/1989
  • Issued: 09/22/1992
  • Est. Priority Date: 09/07/1988
  • Status: Expired due to Term
First Claim
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1. An optical correlator for identifying an object automatically from among two-dimensional images through a coherent optical process, comprising:

  • means for generating a coherent light;

    means for transforming two patterns of pictorial information to be compared into coherent images by said coherent light;

    means for generating phase conjugate waveforms of said coherent images;

    means for generating pictorial patterns of a sum of said two patterns of pictorial information and of a difference between said two patterns of pictorial information by said phase conjugate waveforms;

    means for transforming said pictorial patterns into Fourier transform images individually;

    means for receiving said Fourier transform images; and

    means for transferring output data of said means for receiving said Fourier transform images to said means for transforming said two patterns of pictorial information into said coherent images.

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