Digital copier with document image region decision device
US4707745A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1985 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Dec 20, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40062
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital copier for reproducing images carried in a document by converting them to an electrical binary or recording/non-recording signal and recording the binary signal. The copier includes a halftone image processor unit for generating a binary signal associated with a halftone image included in the scanned document images, and a binarizer unit for generating a binary signal associated with a two-level image included in the document images. The copier also includes an image region decision unit for determining to which one of a halftone image region and a two-level image region a pixel of a document image which is to be read belongs. The decision is made using binary data which is produced by processing the scanned image data with respect to a threshold level different from a threshold level adapted for simple binarization. Edges of the decided halftone image are processed in an optimum manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.