Method and circuit for electronic shutter control
US6674475B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 9, 1999 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Aug 9, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/71
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved method and apparatus for controlling the shutter open time in an opto-electronic device is presented. A frame of pixel intensity data is collected and the average pixel intensity value is across said frame is calculated and compared to a first threshold. If the average pixel intensity is outside a first intensity range defined by said first threshold, the shutter open time is adjusted in a first direction. Otherwise, the peak pixel intensity value across the frame is found and compared to a second threshold. If the peak pixel intensity value is outside a second intensity range defined by said second threshold, the shutter open time is adjusted in said first direction. If the peak pixel intensity value is not outside a second intensity range, the peak pixel intensity value is compared to a third threshold. If the peak pixel intensity value is outside a third intensity range defined by the third threshold, the shutter open time is adjusted in a second direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.