Image processing apparatus and image processing method for extracting feature points of a document image
US10091390B2 · kind B2 · utility
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17Claims
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Key dates
| Filing date | Sep 15, 2016 |
| Grant date | Oct 2, 2018 |
| Priority date | — |
| Expiry date | Sep 15, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/3876
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus obtains image data of a document image and extracts a plurality of feature points of the document image. The image processing apparatus obtains a skew angle of the document image with respect to a predetermined direction and an assembling angle of an image obtaining unit with respect to a predetermined assembling direction from a coordinate correspondence relationship between coordinates of a plurality of feature points of a registered document image registered in advance and coordinates of the plurality of extracted feature points of the document image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.