Image processing apparatus capable of eliminating moire pattern
US4893195A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1988 |
| Grant date | Jan 9, 1990 |
| Priority date | — |
| Expiry date | Aug 25, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40075
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
When an original comprised of a plurality of areas different half tone images is read, any one of the areas is designated at first. A magnification rate of projection for eliminating moire pattern is set and the image of the original is projected on the image sensor at this magnification rate to be converted into electrical data. The electrical data is electrically reduced at a reducing magnification rate which is in correspondence with the magnification rate of projection. Among the reduced electrical data, only those for the designated area are half tone processed and outputted, and the image of that area is printed on a paper. Thereafter, designation of other areas is carried out and the electrical data is outputted by similar processing. The images of these areas are printed on the same paper, whereby all images of the original are formed on the paper without moire pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.