Methods for controlling systems using control signals embedded in empirical data
US5832119A · kind A · utility
576Cited by
220References
57Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1995 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Sep 25, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3271
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An embedded multi-bit signal is steganographically detected from empirical data, such as image or audio data, and some aspect of a related system's operation is controlled in accordance therewith. One application of the invention is a video playback or recording device that is controlled in accordance with the embedded multi-bit signal to limit playback or recording operations. Another is a photo-duplication kiosk that recognizes certain steganographic markings in an image being copied and interrupts the copying operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.