Method for auto-cropping a scanned image
US7418140B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 2006 |
| Grant date | Aug 26, 2008 |
| Priority date | — |
| Expiry date | Sep 13, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/56
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a method for dynamically refine the threshold values of R(Red), G(Green), B(Blue) colors for determining a borderline pixel in response to the values of a background image, thereby to precisely determine the borderlines of the Area of Interest (AOI). The method of the invention first searches the borderline pixels of a scanned image according to the standard differences of the R,G,B values of the pixels. Then, approximate the R,G,B threshold values of the borderline pixels by repeatedly averaging the current R,G,B values of the borderline pixels and the previous R,G,B threshold values until the difference is less than a predetermined value. The approximated R,G,B threshold values are set for the new R,G,B threshold values for determining the attribute of a pixel for subsequent prescanned images. Accordingly, the AOI can be automatically selected by reading the image circumscribed by the borderline pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.