When I bought a webcam for my front door - mine is the Linksys WVC54GCA - I was faced with a predicament. The built-in motion detection software bombarded my email inbox with images of an empty frame. It was set off by the motion of a leaf or a reflection, rendering one of the most important aspects - notification of trespass - ineffective.
At an impasse, I decided to build a cyberbiomimetic AI using a cockroach brain and a vat of amino acids. The resulting system, while effective at spotting intruders, eventually threatened to become self-aware and so I had to shut it down. Finally, I tried Vitamin D.
Problem, as they say, solved.