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Automatic alignment of a contrast enhancement system

  • US 10,096,096 B2
  • Filed: 08/01/2017
  • Issued: 10/09/2018
  • Est. Priority Date: 06/28/2007
  • Status: Active Grant
First Claim
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1. A vein imaging system comprising:

  • a light source configured to illuminate a field of view with a first wavelength of light comprising an infrared wavelength, to create an image contrast of one or more veins formed by differential amounts of absorption and reflection of said first wavelength of light by the one or more veins and surrounding tissue in the field of view;

    an alignment card comprising a pattern, said alignment card configured to emit a second wavelength of light when positioned in the field of view and exposed to a third wavelength of light comprising a visible wavelength;

    a camera configured to capture said image contrast of the one or more veins;

    a projector configured to project said captured image contrast onto the field of view using said third wavelength of light;

    wherein said camera is further configured to capture said second wavelength of light emitted by said alignment card, and to capture said visible light at said third wavelength reflected from said alignment card, said camera further configured to distinguish said third wavelength of light reflected by said alignment card, from said second wavelength of light emitted by said alignment card; and

    an image processor configured to align said projection of said captured image contrast with said reflected image contrast, from said distinction between said captured reflection of said projected alignment card pattern at said third wavelength of light, and said captured emission from said alignment card pattern at said second wavelength.

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