Method and apparatus for distortion correction of scanned images
US5497236A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1993 |
| Grant date | Mar 5, 1996 |
| Priority date | — |
| Expiry date | Jun 23, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04791
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved method and apparatus for correcting for splay is provided. A document distorted by the curvature of a page of text away from a platen is converted to a digital image. The digital image is the manipulated to remove the distortion by fitting the lines of text in an unsplayed portion to a skew line, which represents the deviation of lines of text in the digital image from horizontal. Then the splay is determined for each line of text. Once the skew and the splay are determined, an inverse transformation is done to straighten the lines of text. A horizontal stretching is also applied to the text to correct for the projection angle of the original document.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.