NETAVIS Observer 4.6 User Manual (October 2015)
Page 151 of 204
8.
In the text field
Minimum time for staying inside field (sec)
(for
Object is crossing field
event triggers) or
Min. time for stopping/staying inside (sec)
(for
Object stops in field
triggers) you can enter a minimum time required for an object that either stops or stays inside a
field before an event is triggered.
9.
When you press the
Next
button you can define additional constraints for the event trigger. You
can limit the counting only to certain object sizes, certain aspect ratios, and a certain speed.
Currently those measures are definable in pixels (please keep in mind that the resolution iCAT
works on is either CIF or QVGA depending on the aspect ratio of the camera). Zero values in these
fields mean that there is no constraint.
Hint for constraining the object size or speed
: The size is the area of the object in pixels and
the speed is also measured in pixels per second. To know what object sizes or speeds you want
to filter it is helpful to watch a few objects passing the triggers and switch on the object markers.
These markers show the size and speed of the object in pixels. These are exactly the same
measures that you can use for the trigger. Here is an example of an object marker (Object ID is
[10], object size is 9110 pixels, speed is 208 pixels/sec):
The section
15.4.1 Displaying iCAT information in the Online Monitor and when playing recordings
on page 163 shows you how to view object markers.
10.
In the
Identifier
text field enter a name for this event trigger.
11.
Push
Save
to save your definition.
Please note
:
- If you add a new iCAT definition, it will automatically be assigned to all iCAT schedules of the
camera. If you do not want that, you have to remove the assignment manually (see
15.3.15
Scheduling iCAT operation and recording
on page 160).
- If a definition is not assigned to a schedule then it will not be activated and no archive
recordings will be made and no events will be generated.
15.3.6 Defining sabotage detection
iCAT offers intelligent features for detecting three types of camera sabotage actions:
Camera defocused
Camera covered
Camera moved
Please note
: For sabotage detection an object tracking region is NOT needed.
When initializing the camera for sabotage detection please make sure that the camera has the correct
focus setting and that the scenery and brightness is stable.
Here are the steps for installing iCAT-based sabotage detection:
