Printed matter including invisible information and printing system
US6768558B1 · kind B1 · utility
33Cited by
4References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 20, 2000 |
| Grant date | Jul 27, 2004 |
| Priority date | — |
| Expiry date | Mar 20, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0051
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To invisibly embed additional information in a base pattern and to visualize the additional information, a dislocation is provided in a boundary between the base pattern compose of striped thin lines and the additional information pattern composed of striped thin lines. This dislocation makes the stripes of the patterns discontinuous. The additional information pattern is invisibly embedded in the base pattern such that a sequence of dislocations in the stripes forming the boundary is at an angle equal to or larger than a predetermined angle with respect to the stripe direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.