Motion detection in surveillance systems is quite a bit different than motion detection in alarm systems. For many, motion detection is thought to be interchangeable between the two, but in reality, they work in a different manner from one another. In an alarm system, a passive infrared sensor, or PIR, uses a beam in a particular area. If this beam is broken, the alarm is triggered to go off as motion has been detected. Adjustments often need to be made to these sensors to avoid pets, wild animals, and blowing debris setting off the alarm.
In cameras, motion detection is a bit simpler and more straightforward. The camera is trained to produce images that the DVR is trained to see as an algorithm. If changes in this algorithm are detected, the DVR will then detect these changes as motion. This isn’t a failsafe method, and just like in PIR systems, some changes may need to be made in order to avoid moving clouds, debris, and pets triggering noteworthy changes in the algorithm.
•Adjusting sensitivity in cameras is kept simple. All one has to do is visit the main menu, choose the detect option, and choose your channel to adjust your camera’s level of sensitivity.
•Adjusting To The Proper Sensitivity Level For Your Motion Detection Surveillance System
Typically, your motion detection surveillance system will have sensitivity ratings from 1 to 6, with 1 representing the lowest level of security and 6 the most sensitive. Usually, your DVR will come preprogrammed to around a 2 or 3, providing a nice mid-level base suitable for most users. If this 2 or 3 is found to be too sensitive, you’ll want to program your DVR closer to a 6, and if you prefer higher sensitivity, you’ll want it programmed closer to a 1.
Different Types Of Security Cameras That Utilize Motion Detection
It’s not just standalone security cameras that use motion detection. Auto tracking pan tilt zoom, or PTZ, cameras use motion detection to track moving objects that fall into the camera’s line of sight. At a warehouse, for instance, if the camera detects someone walking into the entrance and moving toward the back, the motion will trigger the camera’s movement and the camera will “follow” the object until it falls out of the camera’s possible line of vision. These types of security cameras are best installed in places where there should be no movement, and in the warehouse scenario, only turned on at night when the warehouse should be empty.
In instances when two objects go into the line of vision of the PTZ camera, the camera will naturally follow the larger object. Additionally, if an object stops and stands still for some time, the camera will stop detecting motion and move back to its original position.
CCTV analytics uses similar technologies to analyze real-time images captured and investigate them to see if they meet certain criteria. With some surveillance systems, they may even be programmed to follow a specific individual if they’re detected on film.