Camera-based handwriting tracking
US6633671B2 · kind B2 · utility
24Cited by
14References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1999 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | Jan 28, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/35
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for processing handwriting that uses an ordinary camera as an image input device. The output of a single camera is used to produce a probability function that indicates the likelihood of whether the pen is touching the paper. The function uses clues including ink on the page and/or shadows. Another embodiment uses both pen up and pen down information to dynamically time warp-fit the information to fit it to a template.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.