Apparatus and method for digitizing and segmenting a handwriting movement based on curvilinear and angular velocities
US5077802A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 11, 1991 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | Feb 11, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/382
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The apparatus and method for digitizing and segmenting a handwriting movement comprises an electrical transducer for generating three electrical digital position signals characterizing a trajectory of the handwriting movement. The apparatus comprises a device for low-pass filtering the electrical signals; a device for deriving the electrical signals by predetermined time and transfer functions for generating V.sub.x and V.sub.y electrical components which represent respectively speeds of the point according to X and Y axes of a cartesian reference; and a device for calculating V.sub..sigma. and V.sub.74 values from the V.sub.x and V.sub.y values. The apparatus also comprises a device for calculating handwritten components and handwritten strings, where each of the handwritten components is delimited by two successive liftings of the point along the trajectory, and each of the handwritten strings is delimited by two successive portions of the trajectory where the V.sub..theta. value is higher than a predetermined angular speed value and the V.sub..sigma. value is lower than a predetermined curvilinear speed value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.