Signature verification method using hidden markov models

Details Signature verification method using hidden markov models Signature verification method using hidden markov models

1998-07-01

2000-12-05

Mehta, Bhavesh

Image analysis

Applications

Personnel identification

382123, G06K 900

Patent

active

061577316

ABSTRACT:
A signature verification method involves segmenting a smoothed and normalized signature and, for each segment, evaluating at least one local feature, thereby to obtain a feature-value vector. The method further includes computing the likelihood that the segments having the observed sequence of feature values were generated by a particular hidden Markov model, such model comprising a sequence of states having duration probabilities and feature-value histograms. In one aspect, the invention involves explicit state-duration modeling to account for duration in the respective states underlying the unknown signature. In another aspect, the invention involves computing a measure of signature complexity, and setting the number of states of the hidden Markov model according to such complexity measure.

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