Contactless fingerprint acquisition and processing
First Claim
Patent Images
1. A contactless fingerprint acquisition and processing method, comprising:
- detecting and acquiring an object image, wherein acquiring the object image comprises illuminating an object with a light source having a polarizer, receiving data from a first detector assembly and a second detector assembly that each comprise a polarizer, wherein the polarizers of the two detector assemblies are out of phase such that the polarizer of the first detector assembly is set to match the phase of the light source polarizer and the polarizer of the second detector is out of phase with said polarizer of the first detector assembly;
converting the object image into a fingerprint image, wherein the converting comprises differencing the data received from first detector assembly with the data received from the second detector assembly using registration information to increase a contrast between ridges and valleys of the fingerprint image; and
at least one of identifying and verifying the fingerprint image.
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Abstract
A contactless fingerprint acquisition and processing method, includes detecting and acquiring an object image, converting the object image into a fingerprint image and at least one of identifying and verifying the fingerprint image.
27 Citations
20 Claims
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1. A contactless fingerprint acquisition and processing method, comprising:
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detecting and acquiring an object image, wherein acquiring the object image comprises illuminating an object with a light source having a polarizer, receiving data from a first detector assembly and a second detector assembly that each comprise a polarizer, wherein the polarizers of the two detector assemblies are out of phase such that the polarizer of the first detector assembly is set to match the phase of the light source polarizer and the polarizer of the second detector is out of phase with said polarizer of the first detector assembly; converting the object image into a fingerprint image, wherein the converting comprises differencing the data received from first detector assembly with the data received from the second detector assembly using registration information to increase a contrast between ridges and valleys of the fingerprint image; and at least one of identifying and verifying the fingerprint image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 20)
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10. A computer program product having a non-transitory computer readable medium storing instructions for causing a computer to perform a contactless fingerprint acquisition and processing method, the method comprising:
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detecting and acquiring an object image, wherein acquiring the object image comprises illuminating an object with a light source having a polarizer, receiving data from a first detector assembly and a second detector assembly that each comprise a polarizer, wherein the polarizers of the two detector assemblies are out of phase such that the polarizer of the first detector assembly is set to match the phase of the light source polarizer and the polarizer of the second detector is out of phase with said polarizer of the first detector assembly; converting the object image into a fingerprint image, wherein the converting comprises differencing the data received from the first detector assembly with the data received from the second detector assembly using registration information to increase a contrast between ridges and valleys of the fingerprint image; and at least one of identifying and verifying the fingerprint image. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A contactless fingerprint acquisition and processing system, comprising:
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a housing; a processor disposed in the housing; a light source having a polarizer, disposed in the housing and configured to illuminate an object; a first detector assembly and a second detector assembly that are both operatively coupled to the processor and configured to acquire fingerprint images, wherein each of the first detector assembly and the second detector assembly comprise a polarizer; and a process configured to detect and acquire an object image, wherein acquiring the object image comprises receiving data from the first detector assembly and the second detector assembly, wherein the polarizers of the first and the second detector assemblies are out of phase such that the polarizer of the first detector matches the phase of the polarizer of the light source; convert the object image to a fingerprint image, wherein converting comprises differencing the data received from the first detector assembly with the data received from the second detector assembly using registration information to increase a contrast between ridges and valleys of the fingerprint image; enroll the fingerprint image; and at least one of identifying and verifying the fingerprint image. - View Dependent Claims (19)
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Specification