Identification by handwriting verification
US4040010A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1975 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Nov 6, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F18/28
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A person, who is to have his identity verified, first writes his signature or any other appropriate group of characters or symbols several times with a special pen which produces signals representative of the writing forces in the plane of the paper and the writing pressure. From these a number of different parameters are derived. These parameters may be, for example, average value, energy, timing, number of zero crossings, etc. Average values and standard deviations are obtained for each of these parameters and these are stored as components of a template vector. In order to detect whether or not a later handwriting sample is authentic, a measure of the difference between the template vector and the later handwriting sample vector is calculated. The distinction between true signatures and forgeries is then made on the basis of this difference. If it is less than an appropriately selected value the signature is judged authentic while if it is above such value it is judged a forgery. The measure of difference may be in terms of RMS difference, for example, or say, average difference. Or, a signature may be deemed a forgery if any one component of the later written signature vector, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.