Image reading apparatus for determining whether a document contains a distinguishing pattern
US8917406B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2010 |
| Grant date | Dec 23, 2014 |
| Priority date | — |
| Expiry date | Oct 23, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0081
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
As provided with a first reading section and a second reading section for reading both surfaces of a document, an image reading apparatus respectively calculates gamma correction values in gamma correcting sections and correction factors in color correcting sections, and corrects colors of criteria images being read by the first reading section and the second reading section in accordance with sample data stored on a storing section in order to substantially match the colors of both criteria images. In addition, the image reading apparatus utilizes an distinctive color range common for the both surfaces which defines a color about a distinguishing pattern, in order to determine whether images of both surfaces contain the distinguishing pattern or not.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.