Method and unit for binary processing in image processing unit and method and unit for recognizing characters
US5243668A · kind A · utility
17Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1991 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Jan 28, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for binarizing a variable density image wherein brightness of the variable density image is changed by 1/n (where n is an integer of 2 or above), and an expansion processing is carried out on the brightness changed image to generate an expanded image. A smoothing processing is performed on the expanded image to generate a smoothed image and a differential image is generated by taking a difference between the smoothed image and the variable density image. The differential image is binarized by comparing the differential image to a predetermined threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.