Image processing apparatus for determining copying-inhibited document
US5781653A · kind A · utility
28Cited by
5References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 31, 1995 |
| Grant date | Jul 14, 1998 |
| Priority date | — |
| Expiry date | Aug 31, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
There is provided by the present invention an image processing apparatus which accurately determines a copying-inhibited document prepared by using paper with a copying-inhibited pattern printed or copied on the entire surface thereof by checking for each pixel data constituting image data whether an object pixel has a black peak density coincident to that of a copying-inhibited document, whether a white area having a specified size exists at a peripheral area at a distance therefrom, whether the object pixel is a screen tone graph or character area pixel, or an illegal area pixel or not.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.