Image forming apparatus capable of printing a copy-forgery pattern
US8358444B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2009 |
| Grant date | Jan 22, 2013 |
| Priority date | — |
| Expiry date | Nov 1, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/2346
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image forming apparatus includes: an image data forming unit that forms an image data which includes a first dot image to be visible by copying, a second dot image to be invisible by copying, a hidden text portion and the background portion; and an image forming unit that carries out image formation by using the image data formed by the image data forming unit, the first dot image has a first color and includes dots having a dot size increased by decreasing the number of lines of dots, the second dot image has a second color and includes dots having a dot size decreased by increasing the number of lines of dots, and the second dot image is stacked on the first dot image in at least one of a hidden text portion or a background portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.