Apparatus for selecting originals for copying on the basis of image sharpness
US3981579A · kind A · utility
10Cited by
6References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1973 |
| Grant date | Sep 21, 1976 |
| Priority date | — |
| Expiry date | Sep 7, 1993 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/72
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The density of neighboring portions of each of a plurality of successive originals is monitored. An original is copied only if the original is comprised of at least one pair of monitored neighboring portions differing from each other in density by an amount exceeding a reference value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.