dekova

I'd like to use a DVR and cameras to monitor the outside of the house and set it up so that it dings/chimes/etc when motion is detected. My question is about the motion detection capabilities on today's DVRs... Are they reliable enough to take the place of my alarm system's motion detectors? Can they be set up to avoid getting multiple false alarms daily? I know you can block out areas of the camera so that they're ignored... is that enough to make these things work reliably?