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Motion detection problem on dm368 appro 3.0

Hello !

Now, I'm using motion detection on Dm368 appro 3.0 .but I meet with problem as following.

1.   if camera is under bright light conditions,the motion detection is normal. If camera under dim light or dark conditions, video have relatively large noise ,So it  causes  that  SAD is larger than the threshold value. false alarms generate. How should I do?

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