Apparatus for signature verification

Details Apparatus for signature verification Apparatus for signature verification

1982-04-26

1985-01-22

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 13, G06K 962

Patent

active

044956444

ABSTRACT:
A method for real-time signature verification uses a transducer pad in which the pressure of a stylus causes contact to be made between two resistive films. Such a transducer is energized by current pulses to sample pairs of X and Y coordinates every 5 milliseconds. The analogue voltage outputs are converted to digital form and processed under the control of a microprocessor to determine numerical parameters each representing a significant feature of the signature pattern. A set of specimen signatures is collected and from these the mean values and standard deviations of several relevant parameters are calculated and committed to memory. The parameters for a working signature are compared with the respective stored mean values for the individual concerned. Each deviation from a stored mean value is compared with the corresponding stored standard deviation in a non-linear scoring circuit. The aggregate score derived from the comparison of several parameters is compared with a preset threshold level to decide whether or not a working signature is genuine.

REFERENCES:
patent: 3699517 (1972-10-01), Dyche
patent: 3818443 (1974-06-01), Radcliffe, Jr.
patent: 4128829 (1978-12-01), Herbst et al.
patent: 4156911 (1979-05-01), Crane et al.

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