Generating a matte signal from a retro reflective component of a front projection screen
US6796656B1 · kind B1 · utility
23Cited by
6References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 14, 2003 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Jun 14, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/275
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A white projection screen containing a small number of infrared retro reflective elements, uniformly distributed over the screen's surface, is illuminated by an infrared source and observed by a coaxially located infrared camera. A matte signal is generated utilizing a high signal level from the infrared camera in all unobscured areas on the screen, and a very low signal level in screen areas obscured by a presenter between a projector and the projection screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.