Automatic signature verification

Details Automatic signature verification Automatic signature verification

1991-10-25

1993-10-05

Razavi, Michael T.

Image analysis

Histogram processing

For setting a threshold

382 16, G06K 900, G06K 946

Patent

active

052512657

ABSTRACT:
A method and apparatus for automatically verifying a signature of an individual is described. The apparatus digitizes an image of the signature and provides a grey scale representation of each pixel. Next, the apparatus determines parameters of this digitized image and compares them to corresponding reference parameter values which were determined from a valid signature. The results of the comparison indicate if the signature to be verified is valid. The parameters include a center of gravity of the pixels within each row and columns of the digitized image, a center of gravity line for the centers of gravity for the rows or columns and the center of gravity for all pixels of the image. Other parameters include the positions of maximum grey scale pixels within each row or column, sums of grey scale values per column or row and the shape of a bow within the signature image.

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"Computer Detection of Freehand Forgeries", R. N. Nagel et al., IEEE Transactions on Computers, vol. C-26, No. 9, Sep. 1977, pp. 895-905.
IBM Technical Disclosure Bulletin, vol. 25, No. 10, Mar. 1983, J. Kim "Baseline Drift Correction of Handwritten Text".

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