User guide

DETEXI NVR 73 - 169
Video motion detection defines activity by analyzing data and differences in a series of images. Software
algorithms continually compare images from a video stream to detect changes in an image. The motion
indicator graph (at bottom left) indicates the motion detected (Fig 46).
9 Each vertical line in the graph indicates motion detected; the height of the line shows how
much motion was detected at the moment.
9 When a vertical line passes above the green horizontal line it turns red, indicating that
motion detected will trigger the system reaction.
Two parameters are available for fine-tuning the system. These parameters include the Roughness for
how large an object should be for the system to trigger, and Sensitivity for how much an image can
change before the system reacts. Finding the right balance between these settings will directly impact the
number of false alarms the system will give and whether all relevant motion in the scene is detected.
Region of Interest (ROI)
Region of interest (ROI) defines the region of the camera’s view that should be analyzed for motion.
Regions that will be analyzed show red, while motion in unpainted regions will be ignored. The ROI grid
can be resized and moved, and each box within the grid can be turned on or off individually. If no ROI is
defined, the entire view will be analyzed for motion.
Fig 47. NVR Control Center — Cameras — Recording — Motion Settings
(Region of Interest.)
To create a Region of Interest (ROI) for an existing recording schedule (Fig 47):