Method for imaging fingerprints and concealing latent fingerprints
AssigneeVeridicom, Inc.
InventorsAnthony P. Russo, Lawrence O'Gorman
Life of this patent
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Abstract
A method of operating a personal verification system includes acquiring with a sensor a first image of a first biometric feature, removing background noise associated with the sensor from the image, and storing at least a portion of the first image. The method also includes acquiring with the sensor a second image of a second biometric feature and comparing at least a portion of the second image with the first image. If the second image is substantially different from the first image, the second image is displayed.
Claims40
A method of operating a personal verification system comprising:
- determining whether a first biometric feature is present on a sensor;
- acquiring, with the sensor, a first image of said first biometric feature when the first biometric feature is present;
- storing at least a portion of the first image when the first biometric feature is removed from the sensor;
- acquiring, with the sensor, a second image of a second biometric feature;
- comparing at least a portion of the second image to the first image;
- and
- displaying the second image if the second image is substantially different from the first image.
A method of operating a personal verification system comprising:
- estimating a background noise from a biometric sensor, by acquiring an image without a biometric feature positioned on the sensor, and averaging an amount of background noise over a portion of the image;
- acquiring a first image of a first biometric feature positioned on the sensor;
- removing the background noise from the first image to obtain a noise-reduced image by calculating for each pixel of the image a difference between the acquired first image and the average amount of background noise over the portion of the image, and dividing the difference for each pixel by the average amount of background noise over the portion of the image;
- and
- applying a gain to the noise-reduced image to enhance the first image.
A personal verification system comprising:
- a biometric sensor;
- a computer implemented means operable with the sensor for determining whether a first biometric feature is present on the sensor;
- a computer implemented means operable with the sensor for acquiring a first image of said first biometric feature when the first biometric feature is present;
- a computer implemented means for storing at least a portion of the first image when the first biometric feature is removed from the sensor;
- a computer implemented means operable with the sensor for acquiring a second image of a second biometric feature;
- a computer implemented means for comparing at least a portion of the second image to the first image;
- and
- a computer implemented means for displaying the second image if the second image is substantially different from the first image.
Dependencies are inferred from the claim text.