Touch system and method for determining the distance between a pointer and a surface
US9229586B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 2014 |
| Grant date | Jan 5, 2016 |
| Priority date | — |
| Expiry date | Jul 2, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04101
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for determining the distance from a tip of a pointer to a surface using a light source and a single camera, the method comprising detecting in an image captured by the camera a tip of the pointer, determining in the image captured by the camera the intensity of a set of pixels below the tip of the pointer, the intensity defining a reflection by the surface of the tip of the pointer illuminated by the light source, and determining the distance from the tip of the pointer to the surface depending upon the intensity of the set of pixels below the tip of the pointer and an intensity of pixels of the tip of the pointer in the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.