Method and apparatus indentifying halftone regions within a digital image
US7702154B2 · kind B2 · utility
1Cited by
15References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 2, 2006 |
| Grant date | Apr 20, 2010 |
| Priority date | — |
| Expiry date | May 10, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/413
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
One embodiment of the present invention provides a system that identifies halftone regions within a digital image. During operation, the system receives a region from the digital image, wherein the digital image is a bi-level image, wherein each pixel has two possible color values. Next, the system computes a variation index for a region of the digital image, wherein the variation index indicates how frequently adjacent pixel values in the region differ. If the variation index for the region is greater than an upper threshold, the system determines that the region is a halftone region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.