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Latent fingerprint detectors and fingerprint scanners therefrom

  • US 9,767,340 B2
  • Filed: 10/06/2015
  • Issued: 09/19/2017
  • Est. Priority Date: 11/03/2010
  • Status: Active Grant
First Claim
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1. A method of detecting surface contaminants, comprising:

  • illuminating a sample surface with a first light source to produce specular reflection from the sample surface;

    capturing the specular reflection from the sample surface with an optical detector arranged at a critical alignment angle relative to the first light source;

    generating image data with the optical detector using the specular reflection to generate image data of the sample surface;

    discriminating against diffuse reflection by said first light source and said optical detector having substantially equal and opposite numerical apertures with geometric filtering; and

    analyzing said generated image data of the sample surface with a processor to determine if said generated image data includes an image of a surface contaminant.

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