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Searching for Motion
5.6 False Positive Reports
Motion search can be triggered by changes in lighting or movement outside of an area
5.6.1 Flashing Lights
A Source of false positives
A computer monitor can also be a source of false positives. To unmask it or a flashing
light from a search for motion, see figure 51.
!65 To mask out a flashing monitor
1. After preparing a motion search (see 5.2, Preparation), click
, the Show /
Hide mask button.
2. Click on areas of the image where there are computer monitors, television sets
or other sources of flashing light that need to be excluded from a search for
motion. As you click, blocks appear. See figure 51, image 2.
3. Show the masking commands, by placing the mouse pointer on the large video
image and right-clicking.
4. Click Invert Mask. See figure 51, image 3.
Fig. 51. Masking sources of false positive reports. Here, the flashing of a PC monitor is
masked, followed by the Invert Mask command.
!56, on p. 5–6 also explains how to exclude an area.