Steganography methods employing embedded calibration data
US5636292A · kind A · utility
805Cited by
135References
57Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 8, 1995 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | May 8, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0601
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An identification code signal is impressed on a carrier to be identified (such as an electronic data signal or a physical medium) in a manner that permits the identification signal later to be discerned and the carrier thereby identified. The method and apparatus are characterized by robustness despite degradation of the encoded carrier, and by permeation of the identification signal throughout the carrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.