Method and apparatus for identification of documents, and computer product
US6813381B2 · kind B2 · utility
44Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2001 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Dec 26, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/412
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In the document identification apparatus, a ruled line feature extraction section determines a black pixel ratio of a document to be identified, and adds the black pixel ratio for each block to extract a ruled line feature. A ruled line feature verification section verifies the ruled line feature with a ruled line feature already registered in a ruled line feature dictionary to thereby identify the document. If identification is not possible with this procedure, a details judgment section verifies the image data in a specific area with the image data (characters or the like) registered in a specific area dictionary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.