Signature verification apparatus and method utilizing relative angle measurements
US5422959A · kind A · utility
Inventor
Key dates
| Filing date | Jun 25, 1993 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Jun 25, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/30
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A signature verification system consisting of a durable pressure sensitive data input stylus, signal processing, and computer algorithms for enrollment of signatures and verification. The stylus contains two transducers placed so that axial force and lateral force are measured simultaneously. Combining the two signals at digitized sample points yields a ratio of pressures indicative of the angle of the stylus to the writing surface at that moment, controlling for variations in actual force. The ratio, called a relative angle, is calculated for the entire signal train of a signature and for various simple divisions, or segments. Segments are equal divisions of the signal train by various divisions. While the relative angle of the whole signature may vary unpredictably between signings, the unique variations around the average relative angle form unique signature discriminates. Variations are measured by comparing relative angle measurements of segments, one to another, in all mathematical combinations. The combinations are called measurement points and each measurement point has a value based on the comparison. Some measurement point values, out of many sampled by computer, are uniq…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.