Density measuring device
US4123171A · kind A · utility
2Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1976 |
| Grant date | Oct 31, 1978 |
| Priority date | — |
| Expiry date | Sep 16, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/513
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A density measuring device for easily and quickly measuring the optical densities of original pictures which is characterized in that an original picture is scanned by a scanning device to obtain electrical signals of the original picture, the signals are then converted into secondary electrical signals corresponding to the optical density of the original picture by means of a logarithmic converting circuit, calibration signals generated by a calibration signal generator are added to the secondary electrical signals, and thus obtained combined signals are displayed on a wave-form monitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.