Method and apparatus for image classification and halftone detection
US6185335A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1998 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Jul 7, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40062
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for image classification includes a first embodiment, in which halftone detection is performed based on the size of a boundary set between a class of light pixels and a class of dark pixels, and further based upon image information contained within each single image plane (i.e within one color plane). This embodiment of the invention is based upon the distinctive property of images that halftone areas within the image have larger boundary sets than non-halftone areas within the image. A second, equally preferred embodiment of the invention provides a cross color difference correlation technique that is used to detect halftone pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.