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Enhancing Video
Customizing Motion Detection with Masking
By default, motion is detected everywhere in a video feed. Some of that movement may not
be of any interest, such as a roadway in a window, or a door that many people walk by.
Areas of no concern can be masked—that is, they are hidden from motion detection—so
that they do not trigger an alarm.
Masking an Area of the Video Feed
as an example for this procedure:
1.
To perform surveillance on a door that many people walk by, start by setting a mask
on the top section of the door.
Figure 7-10
Motion Detection Mask
2.
After setting the mask, right-click the mouse on the image. A menu appears (see
3.
Select the Invert Mask command; the detection is now focused on an area that
moves only when the door opens.
4.
Enable Log or Alarm. The log can be used to obtain video from the time(s) when the
door is opened, saving a unit operator from having to search through video.
Red Mask and Green Mask
In motion detection, when the mask is red, movement behind a mask is ignored.
The masking behaves opposite to that of motion search. In motion search, the parts that
are masked in green act as motion triggers rather than as a mask.
Masking Part of a Video Feed from Motion Detection
1.
Check that Record/Motion/Image is selected (as in
2.
Click
, the Edit motion mask command.
3.
You have the option of clicking
to Show gridlines. The video image on the Video
tab is overlaid with a grid.
4.
Click areas of the video that you need to mask. To mask more than one cell at a time,
press and hold
Ctrl
while you select cells. This will mask 3×3 cells at once.
First, try setting a
mask at the top of
the door, before
using the Invert
Mask command.
After inverting the mask,
the movement of personnel
in front of the door is
ignored and only door
movements are detected.
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