Paper-to-computer interfaces
US7317557B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2002 |
| Grant date | Jan 8, 2008 |
| Priority date | — |
| Expiry date | Sep 29, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/328
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides an apparatus and method which facilitates the use of a printed or scribed document as an interface with a computer. The apparatus in one aspect comprises: a printed or scribed document bearing specialized calibration marks, the document being positioned on a work surface; a camera focused on the document for generating video signals representing the document in electronic form; and a processor linked to the camera for processing an image captured by the camera and configured to identify the calibration marks of the document in the captured image and then determine from the location of the calibration marks in the image a transformation between co-ordinates of features. In the image and corresponding co-ordinates of features in the document that compensates for the freely variable positioning of the document on the work surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.