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Optical detection of geometric configurations

  • US 4,118,107 A
  • Filed: 01/19/1966
  • Issued: 10/03/1978
  • Est. Priority Date: 01/19/1966
  • Status: Expired due to Term
First Claim
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1. A spatial filter for detecting and locating a selected object configuration from background noise in a recorded image comprising:

  • (a) an amplitude filter that is a (photographic) negative of the Fourier transform of an object corresponding to said selected object configuration and(b) a phase filter that provides π

    phase reversals for alternate amplitude waves of said Fourier transform.

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