Manual

05-2018-A
Ganz GXi Series VCA Interface Manual V3.05.31.18
109 | P a g e
More Information
For more information about the format of the metadata, please consult the VCAsys Metadata Format
Manual.
Stationary Object Hold-on Time
The Stationary Object Hold-on Time defines the amount of time that an object will be tracked by the
engine once it becomes stationary. Since objects which become stationary must be "merged" into the
scene after some finite time, the tracking engine will forget about objects that have become stationary
after the Stationary Object Hold-on Time. The default setting is 60 seconds.
Tracking Options
Minimum Tracked Object Size
The Minimum Tracked Object Size defines the size of the smallest object that will be considered for
tracking, in pixels. For most applications the default setting of 'Auto' is recommended as this allows the
algorithm to automatically select the best value.
In some situations, where extra sensitivity is required, the value can be manually specified. While lower
values allow the engine to track smaller objects, it may be more susceptible to false detections.
Display Options
Minimum Alarm Object Display Time
When an alarm is generated, the tracking display displays the object in red. After some time, the object
displays fades back to yellow. This setting controls the time the object is displayed in red, before fading
back to yellow. The default value is 2000 milliseconds.
Minimum Object Display Time
When an object is tracked by the engine, it is displayed on the tracking display. This setting controls the
minimum time an object is displayed in the tracking display. This is so that objects that are tracked for a
very short time are displayed adequately. The default value is 1000 milliseconds.
Both options affect the web browser display and the burnt-in-annotation.
Detection Point of Tracked objects
For every tracked object, there is a point that we use to determine this object's position and decide
whether this object triggers a rule. We call this point as detection point. There are 3 modes to define the
detection point relative to the object: Default, Centroid and Midbottom.
• Default - When user chooses this mode, VCAsys will automatically set the position of detection
point. It chooses centroid if the camera is calibrated overhead, or Midbottom if the camera is
calibrated side-on or uncalibrated.
• Centroid - If user chooses this mode, VCAsys will force the detection point to be centroid.
• Midbottom - If user chooses this mode, VCAsys will force the detection point to be Midbottom.