Honeywell HCD5HIH Reference Manual page 76

IP Camera Web Client
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Increasing VMD sensitivity
If relevant scene motion does not trigger VMD alarms, the following adjustments will
increase VMD sensitivity:
• Decreasing the sensitivity level from 80% to 50%, or from 50% to 30%. This change
will cause smaller objects to trigger alarms and it will also require smaller contrast
level to report and alarm. This should be the primary adjustment mechanism.
• Reducing the size of the region-of-interest box (and adding more regions if needed).
This adjustment will cause smaller objects to also trigger VMD alarms.
Note After VMD sensitivity is increased, observe the performance in other lighting
conditions in case further tuning is required to prevent false alarms.
Decreasing VMD sensitivity
If VMD alarms are triggered even when there is no motion and no large changes in the
video, the following adjustments will decrease VMD sensitivity:
• Increasing the sensitivity level from 30% to 50%, or from 50% to 80%. This should be
the primary adjustment mechanism, because it increases the required contrast level
(or amount of noise) required to trigger an alarm. Higher sensitivity levels also require
larger amount of motion to be observed before a VMD alarm is triggered.
• Increasing the size of the region-of-interest box. This adjustment will prevent smaller
objects (or smaller areas of noise) from triggering VMD alarms.
VMD configuration examples
These examples are provided only for illustration. Other factors such as lighting level,
contrast, and image noise may affect VMD performance and may require tuning
adjustments as described above.
Normal Field of View
In a normal field of view, with a person walking in front of the camera, the maximum
recommended region-of-interest box sizes would be as shown by the red boxes in
Figure 4-34, Figure 4-35, and
Note Outdoor scenes are shown in the following examples. HCD5 cameras are
outdoor cameras only when used with the appropriate environmental
housing.
Figure 4-36.