Video recording prevention system
US8696135B2 · kind B2 · utility
3Cited by
24References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 19, 2008 |
| Grant date | Apr 15, 2014 |
| Priority date | — |
| Expiry date | Apr 29, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/91392
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projector has at least four primary color components controlled to produce a metameric effect image which is not perceptible to the human optical system and is perceptible to a video recording device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.