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Assigning Counters to Counting Lines
A counting line by itself simply generates events when an object to be counted is detected.
In order to actually count the events, counters (one for each direction) can be created and
configured to count the events generated by the line. To create counters, see the Counters
topic.
Calibrating the Counting Line
In order to generate accurate counts, the counting line requires calibration. This cannot be
performed at a general level for the whole scene using the 3D calibration tool. This is
because the counting line is not always placed on the ground plane: it may be placed at any
orientation at any location in the scene. For example, a counting line could be configured
vertically with a side-on camera view.
Instead of the 3D calibration tool, the counting line has its own calibration setting. Two bars
equidistant from the centre of the line represent the width of the expected object. This
allows the counting line to reject noise and also count multiple objects.
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