Signature verification method using hidden markov models
US6157731A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jul 1, 1998 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Jul 1, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F18/295
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.