In my experience it is nearly impossible to completely rid your self of false alarms using video based motion detection outdoors, Infrared light attracts bugs like nobody's business and theres way too many changing factors.. You can greatly reduce the false alarms to every once and a while with a ton of tuning and tweaking, but one way or another your still going to get false alarms.
Ever heard the story of the boy whom cried Wolf? How effective are those notifications going to be a few months from now when your pretty much ignoring them.. so really whats the point of having them in the first place?
If your camera never had false alarms then being notified at 2am of motion will get your ass out of bed to go investigate.. but when you wake up and find a cat at your door you wont get out of bed the next time.. a pet-immune motion sensor would never have woken you up.
I use real physical security sensors to notify me when someone opens my mailbox, rings my
doorbell, opens a gate or door, and walks into my parking area to detect activity... I get notified 100% of the time when there is activity and 0% false alarms, as a result if I get notified my perimeter has been breached I trust it and take appropriate action.
IMHO False Alarms are as dangerous as No Alarms, perhaps worse because you will kick your self in the ass when you do miss something important.
A security camera's basic function is to record video.. thats it, its very poor at alerting you to a threat unless your paying a security guard to watch it 24/7... There are other security devices better designed for active monitoring than Video Motion detection.
