Fingerprint detector using ridge resistance sensor
First Claim
1. A method for detecting and verifying a fingerprint comprising the steps of:
- providing a skin resistance sensing array, the skin resistance sensing array translating skin resistance of a fingertip into an electrical signal;
moving the fingertip relative to the skin resistance sensing array in a first linear direction for producing a reference trajectory signal;
storing the reference trajectory signal in a memory;
moving the fingertip relative to the skin resistance sensing array in a second linear direction for producing a sample trajectory signal, the second linear direction being offset from the first linear direction by a predetermined angle;
providing a processor for performing a set of functions on the reference trajectory signal and the sample trajectory signal;
correlating the sample trajectory signal with the reference trajectory signal; and
producing a verification signal related to the probability that the fingertip generated both the sample trajectory signal and the reference trajectory signal.
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Accused Products
Abstract
A technique for detecting and verifying a fingerprint includes a skin resistance sensing array for translating the skin resistance of a fingertip into an electrical signal. The fingertip is moved relative to the skin resistance sensing array in a first linear direction for producing a reference trajectory signal which is stored into a memory. The fingertip is again moved relative to the skin resistance sensing array in a second linear direction for producing a sample trajectory signal. The second linear direction of movement is offset from the first linear direction of movement by a predetermined angle. A processor is provided for performing a set of functions on the reference trajectory signal and the sample trajectory signal. The sample trajectory signal is correlated with the reference trajectory signal for producing a verification signal related to the probability that the fingertip generated both the sample trajectory signal and the reference trajectory signal.
220 Citations
20 Claims
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1. A method for detecting and verifying a fingerprint comprising the steps of:
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providing a skin resistance sensing array, the skin resistance sensing array translating skin resistance of a fingertip into an electrical signal; moving the fingertip relative to the skin resistance sensing array in a first linear direction for producing a reference trajectory signal; storing the reference trajectory signal in a memory; moving the fingertip relative to the skin resistance sensing array in a second linear direction for producing a sample trajectory signal, the second linear direction being offset from the first linear direction by a predetermined angle; providing a processor for performing a set of functions on the reference trajectory signal and the sample trajectory signal; correlating the sample trajectory signal with the reference trajectory signal; and producing a verification signal related to the probability that the fingertip generated both the sample trajectory signal and the reference trajectory signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for detecting and verifying a fingerprint comprising the steps of:
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providing a fingerprint verification terminal; providing a skin resistance sensing array coupled to the fingerprint verification terminal, the skin resistance sensing array translating skin resistance of a fingertip into an electrical signal; moving the fingertip relative to the skin resistance sensing array in a first linear direction for producing a reference trajectory signal; encoding the reference trajectory signal onto a data carrier card; moving the fingertip relative to the skin resistance sensing array in a second linear direction for producing a sample trajectory signal, the second linear direction being offset from the first linear direction by a predetermined angle; reading the reference trajectory signal from the data carrier card into a memory; providing a processor for performing a set of functions on the reference trajectory signal and the sample trajectory signal; correlating the sample trajectory signal with the reference trajectory signal; and producing a verification signal related to the probability that the fingertip generated both the sample trajectory signal and the reference trajectory signal. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for detecting and verifying a fingerprint comprising the steps of:
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providing a skin resistance sensing array, the skin resistance sensing array translating skin resistance of a fingertip into an electrical signal, and further including a plurality of sensing elements, at least two of the sensing elements being used for generating a velocity function; moving the fingertip relative to the skin resistance sensing array in a first linear direction for producing a reference trajectory signal; storing the reference trajectory signal in a memory; moving the fingertip relative to the skin resistance sensing array in a second linear direction for producing a sample trajectory signal, the second linear direction being offset from the first linear direction by a predetermined angle; providing a processor for generating an intersection matrix of common data points relating to the reference trajectory signal and the sample trajectory signal; correlating the common data points of the sample trajectory signal with the reference trajectory signal; and producing a verification signal related to the probability that the fingertip generated both the sample trajectory signal and the reference trajectory signal. - View Dependent Claims (17, 18, 19, 20)
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Specification