Video Motion Detection

The motion detection is a two-stage function. First of all, a check is performed to determine which of the pixels in the specified image field have changed. This is done by way of a pixel-for-pixel comparison with the previous image and by checking whether the set percentage threshold (1st parameter) has been exceeded for this image field. In a second stage, a check is then performed is determine whether the number of pixels which are detected as having moved exceeds a specified area portion (2nd parameter) within the field being monitored.

In addition, full control can be intercepted and suppressed with a predefinable maximum value (3rd parameter). This means that in situations where the number of pixels which have been detected as having moved exceeds the max. limit, the camera detects this as a malfunction and, in this case, there is no event triggered.

Many Small Areas Are More Secure

The motion detection function operates best if the size of the detection areas is adapted in line with the size of the object being detected. It is advisable to detect motion via several small areas which are positioned at the most important places in the camera image (for example a door) instead of across a single analysis area comprising the entire image.

In addition, reference panes can be set with the MOBOTIX cameras; they act and are set like the detection panes. However, they don't generate an event, they suppress it. Thanks to the reference panes, malfunctions such as a light source being switched on or the shadows of moving trees, can be filtered out.

Verification at a Glance MOBOTIX cameras offer the possibility of displaying the status of the motion detection area in the camera image graphically. This allows the setting and functioning of the motion detection to be checked at any time during a test phase.