Image processing apparatus and method of controlling the same
US8064636B2 · kind B2 · utility
3Cited by
6References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 28, 2008 |
| Grant date | Nov 22, 2011 |
| Priority date | — |
| Expiry date | Sep 4, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/327
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To accurately extract embedded information from a document image using line spacing watermark, an image processing apparatus for extracting watermark information includes an input unit which inputs a document image as image data, an image reduction unit which generates, from the image data, reduced image data reduced in the first direction, a detection unit which scans the reduced image data in the second direction and detects the length of a blank region as line spacing information, and an extraction unit which extracts watermark information embedded in the document image based on the line spacing information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.