Method of recognizing fingerprints by coloring and computer system for implementing the said method
First Claim
1. A method of recognizing fingerprints comprising the following steps:
- displaying a first fingerprint image, representing a first fingerprint, available with various levels from a grey scale;
modifying said first image to produce a second fingerprint image in which at least one grey range of the first image is parameterized with a set of parameters so as to be represented with various levels from a color scale;
analyzing characteristic points of the second fingerprint image;
extracting a third fingerprint image from a database based on said characteristic points;
modifying said third image with said set of parameters to produce a fourth fingerprint image; and
comparing the second and fourth images and determining if the first fingerprint corresponds to the fingerprint represented in the fourth image.
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Accused Products
Abstract
The method of recognizing fingerprints comprises an analysis step (21) in which an expert analyses characteristic points of a fingerprint image so as to be able to differentiate the fingerprint whose image is presented to him. The method comprises a modification step (19) in which the said print image available with various levels from a grey scale is modified into a second image in which at least one grey range of the first image is parameterized so as to be represented with various levels from a colour scale. The modification makes it possible to identify the characteristic points on an unknown fingerprint image more accurately and also to compare the said image to other known fingerprint images more easily.
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Citations
10 Claims
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1. A method of recognizing fingerprints comprising the following steps:
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displaying a first fingerprint image, representing a first fingerprint, available with various levels from a grey scale; modifying said first image to produce a second fingerprint image in which at least one grey range of the first image is parameterized with a set of parameters so as to be represented with various levels from a color scale; analyzing characteristic points of the second fingerprint image; extracting a third fingerprint image from a database based on said characteristic points; modifying said third image with said set of parameters to produce a fourth fingerprint image; and comparing the second and fourth images and determining if the first fingerprint corresponds to the fingerprint represented in the fourth image. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A computer system for differentiating one or more fingerprint images, comprising:
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an image producer for producing fingerprint images encoded with various levels from a grey scale; a display driver for presenting on a screen fingerprint images communicated thereto; image modifying means for modifying, with a set of parameters, a first fingerprint image received from the image producer so as to produce a second fingerprint image encoded with various levels from a hue scale and various levels from a brightness scale, and for communicating said second fingerprint image to the display driver; means for analyzing characteristic points of the second fingerprint image; means for extracting a further fingerprint image from a database based on said characteristic points; means for comparing said second fingerprint image and said further fingerprint image, said further fingerprint image being modified by said image modifying means with said set of parameters prior to being compared with said second fingerprint image. - View Dependent Claims (8, 9, 10)
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Specification