Automatic color dropout using luminance-chrominance space processing
US6035058A · kind A · utility
18Cited by
7References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1998 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Feb 10, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A document (10) is scanned to provide a digital image. At least one non-dropout color is selected (32) and transformed to a Luminance-Chrominance space (34). Each pixel of the scanned image is converted to the Luminance-Chrominance space (36) and the distance of each of the image pixels from the non-dropout color is determined (38). Each of the image pixels is converted to black (44) if the distance from the non-dropout color is less than or equal to a threshold value, and converted to white (42) if the distance is greater than the threshold value. The converted black and white pixels are then stored.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.