103
●
How does motion detection work?
There are two motion detection parameters: Sensitivity and Percentage. In the illustration
above, frame A and frame B are two sequential images. Pixel differences between the
two frames are detected and highlighted in gray (frame C) and will be compared with the
sensitivity setting. Sensitivity is a value that expresses the sensitivity to moving objects.
Higher sensitivity settings are expected to detect slight movements while smaller sensitivity
settings will neglect them. When the sensitivity is set to 70%, the Network Camera defines
the pixels in the purple areas as “alerted pixels” (frame D).
Percentage is a value that expresses the proportion of “alerted pixels” to all pixels in the
motion detection window. In this case, 50% of pixels are identified as “alerted pixels”. When
the percentage is set to 30%, the motions are judged to exceed the defined threshold;
therefore, the motion window will be outlined in red.
For applications that require a high level of security management, it is suggested to use
higher
sensitivity settings and
smaller
percentage values.
A
B
D
C
NOTE
