Tools to embed information into digital visual works
US7580155B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 2005 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | Sep 13, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3235
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus are provided, including a digital two-dimensional authentic image, an image processor, authentication message data, and a screen to be applied to at least a portion of the two-dimensional image. The authentication message data represent an authentication message, which may be a textual message, a symbol, or a pattern, and which may signify that the authentic image is authentic or original. The screen may apply two different halftoning operations. The two different halftoning operations include a first halftoning operation applying halftoning elements arranged in one way and a second halftoning operation applying halftoning elements arranged in second way. The first halftoning operation is applied in a limited area of the authentic image and in a form defined by the authentication message data, and the second halftoning operation is applied in an area surrounding the limited area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.