View Full Version : autoexpousre

November 14, 2005, 11:42:18
Dear sir

i use the autoexposure property of this activex...can you explain me the algorithm behind the autoexpousre...how it select the exposure time....

with regards

Stefan Geissler
November 14, 2005, 12:16:46
Hello Dinesh,

The autoexposure is done in the video capture device. It is not done by IC Imaging Control or by DirectShow. So i am not able to tell you, how every camera manufacturer implements his autoexposure algorithm. In general i guess, the average brightness is measured. If it is too dark, the exposure time is advanced, if it is too high, the exposure time is reduced. The autoexeposure reference value, that is available for some cameras, determines the desired brightness for autoexposure.