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Optical correlator

  • US 6,804,412 B1
  • Filed: 08/14/2000
  • Issued: 10/12/2004
  • Est. Priority Date: 12/12/1997
  • Status: Expired due to Fees
First Claim
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1. A method of optical correlation between an input image and a reference image, including the steps of:

  • Optically performing a joint transform correlation between an input image and a reference image;

    displaying the two images side by side as a binary phase image;

    modulating the resulting binary phase image with a phase-encoded checkerboard pattern;

    displaying the modulated image on a spatial light modulator;

    illuminating by a constant light source the spatial light modulator; and

    performing a joint transform correlation on the displayed image, the correlation including binarising an intermediate image by thresholding each pixel using values of its surrounding pixels.

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