Image processing apparatus
US6433896B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1998 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Jun 10, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/3878
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an image processing apparatus, an image reading unit reads a document put on a platen glass to generate image data, and a detector in the image reading unit detects offset, tilt angle and document area of the document put on the platen glass. A rotation angle is set based on the image data of a document. The entire document area is determined based on a portion of the document which exists within the image reading area when the document extends beyond the image reading area. The document area can be detected even if a document is not rectangular. For example, a slope of the document is determined based on the detected longest segment. In order to solve the unequal reading pitch, the longest segment is selected in the segments having a slope smaller than a predetermined angle relative to the subscan direction. Then, the image data are corrected according to the above result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.