Document filing apparatus for storing information added to a document file
US7453594B2 · kind B2 · utility
4Cited by
9References
46Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 9, 2002 |
| Grant date | Nov 18, 2008 |
| Priority date | — |
| Expiry date | Aug 13, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/64
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image memory stores image data of a document file. A bit map developing part converts the document file into bit map image data. A difference information extraction part compares the bit map image data with the image data so as to extract difference information representing a difference between the bit map image data and the image data. The difference information is saved as a deference information file.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.