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3
Advanced Configuration
Analytics Calculations
The video analytics provide recognition of two types of objects based on size and aspect ratio: human
or vehicle. A "moving" object will initially be shown with a yellow box, indicating the analytics have
determined something is moving but have not yet characterized it as human or vehicle or determined
if it is an alarm. The analytics will then try to determine if the size and shape of the moving object
matches with the defined Human Size or Vehicle Size parameters.
The Human Size parameters called Near
Width and Near Height determine another
box (blue), with the bottom of the box aligned
with the bottom of the area. This effectively
determines the maximum size human that
will be detected in the area. Similarly, the Far
Width and Height settings determine another
box (purple) with the top of the box at the top
of the area, and this is the minimum size
human that will be detected.
Depending on the location of the moving
(yellow) box in the area from top to bottom,
the analytics calculate a minimum and
maximum human size that is proportional to
the near and far limits. An alarm is generated
if the yellow detection box "fits" within the size and aspect ratio of the calculated boxes. If there is a
match, the yellow box will turn orange and the camera will generate a human alarm.
The Tolerance percentage determines how closely the sizes of the moving box and the calculated box
must match. A tolerance of 10% will effectively cause the maximum bounding box to increase by 10%
and the minimum bounding box to decrease by 10%. The tolerance is set independently for Human
Size and Vehicle Size.
Similarly, the Vehicle Size parameters
determine the maximum vehicle (near
pink box) and minimum vehicle (far
green box) sizes. If the detection box
"matches" the calculated vehicle box
(based on relative position in the area
top to bottom, and allowing for the
Vehicle Size Tolerance %), it will turn
red and generate a vehicle alarm. Refer
to
Alarm Manager, pg. 3-23
description of available actions as a result of these alarms.
The bounding boxes shown on screen are calculated based on the far and near size parameters,
proportional to the position of the yellow box in the area from top to bottom, and adjusted based on
the Tolerance. Increasing tolerance causes the minimum bounding box to be smaller and the
maximum bounding box to be larger, allowing more variation in the size of the moving target. If
Tolerance is set to 0%, the calculated minimum and maximum are the same, and the boxes are not
shown. A detected object's box (yellow) that falls between the min/max bounding box corresponding
to its location will result in an alarm.
427-0073-12-12 Version 120
Table 3-1: OSD Bounding Box Colors
Bounding Box
Max Vehicle - Pink
Min Vehicle - Green
Max Human - Blue
Min Human - Purple
for a
May 2015
Detection Box
Detection Box - Yellow
Detected Vehicle - Red
Detected Person - Orange
3-6
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