Method of changing magnification of image
US4740844A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1986 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Apr 9, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4055
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of applying magnification changing processing to an image in a digital copier or the like. The processing consists of subprocessing which is effected by operating optics of a scanner, and subprocessing which is effected by space filter processing of the kind using a threshold matrix. When digital video data read by the scanner on a pixel basis and quantized with respect to multiple levels are to be binarized by the space filter processing, the size of the threshold matrix is changed to roughly change the magnification. A delicate change of magnification is performed by the operation of the optics while the scanner reads the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.