Method and apparatus for capturing text images
US6922487B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2001 |
| Grant date | Jul 26, 2005 |
| Priority date | — |
| Expiry date | Sep 16, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A device and method are described for capturing an image of a document using a digital camera. The invention includes a resolution analyzer for analyzing the resolution of text characters in the image, to assess whether the resolution is suitable for OCR. In one aspect, if the resolution is too small or too large, an indicator is generated to guide the user as to the corrective movement of the camera to improve the resolution for OCR. In a second aspect, an electronic zoom control is controlled to alter the magnification of the captured image, to correct the resolution. In a third aspect, a method is described for analyzing the image to determine the resolution according to the height of text characters in the image. The method includes analyzing the run lengths of pixels in the image to identify a predominant length corresponding to the average character height (in pixels).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.