Handwriting verification system
US4040012A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1976 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Apr 28, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/30
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Identification of a specimen signature is provided by comparing the specimen with a previously recorded template signature. The comparison is performed by recording, for both specimen and template signatures, signals representing forces in three directions while generating these signatures. For handwritten signatures these forces are called pressure, for the force perpendicular to the plane of the paper, X for the left-right force in the plane of the paper, and Y for the near-far force in the plane of the paper. The recorded specimen signals are divided into equal parts, for example halves, and successive comparisons are made of the equal parts, first without any displacement, then with relative displacements, then by expanding the length of parts relative to one another, then by reducing the length of parts relative to one another, to find the highest correlation values for all of these comparisons. These are combined and compared with a reference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.