Method and apparatus for stroboscopic video inspection of an asynchronous event
US4794453A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1986 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Sep 9, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/188
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus and method particularly suitable for use with the closed loop color to color registration system of a commercial web printing apparatus utilizes a CCD camera having an image sensor and a synchronization generator circuit which generates periodic scan pulses which trigger the image acquisition scan of the image sensor. A predetermined time prior to triggering of a strobe a prefresh pulse is generated in order to trigger a complete scan of the image sensor prior to firing the strobe. A predetermined time period subsequent to the firing of the strobe a scan triggering pulse is generated to trigger an image acquisition scan of the image sensor. This results in highly stable and reliable acquisition of a low noise image of for example, a registration mark on a printed web which may then be processed by a registration control system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.