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Non-fingerprint region indicator

  • US 4,225,850 A
  • Filed: 11/15/1978
  • Issued: 09/30/1980
  • Est. Priority Date: 11/15/1978
  • Status: Expired due to Term
First Claim
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1. A pre-edit signalling system responsive to an electrical signal analog of a scanned image for indicating the probable absence or presence of a non-fingerprint region of such image, said system comprisinga two-dimensional sequency function transform analyzer responsive to a binary-coded image signal for identifying discrete frequency terms occurring within a preselected bandwidth corresponding to a spatial frequency region associated with descriptions of a fingerprint image;

  • andlogic means responsive to said bandwith limited transform analyzer for further identifying the relative energy level of the bandwidth-limited spectral content of the binary-coded image signal as an indication of the inclusion of a non-fingerprint region within the scanned image represented by said binary-coded signal analog.

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