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1. Set up a virtual line in FoV.

   1. Set the  the end points of the line .
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      Info
      title Note
      When the line is being constructed, the end points are connected by a two-color dotted line. The direction of the object's motion across the line is indicated by dotted arrows.

      
      

      Action	Result
      Position the cursor on an end point and, holding down the left mouse button, move the mouse	Moves the line end point
      Position the cursor on the line, holding down the left mouse button, move the mouse	Moving the line

      
      

   2. By default, Line Crossing crossing detection monitors object motion across the line in both directions. To suspend detection of motion in one direction, click the button  to that direction.

      Note
      title Attention!
      At least one direction must be selected for detection.

      
      

      Info
      title Note
      An unmonitored direction of object motion is indicated by a dimmed arrow.

      
      

2. If an object in FoV performs repetitive movements near the virtual line, it may cause excessive triggering of the detection tool. In this case, set an area within the object's track which must cross the line completely to trigger the tool. To do it, set the X and Y offset values as percentage of track width and height.
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   Here's an example: the green triangle is the track of the object. If you specify X and Y offset values as 25%, the tool will be triggered only if the entire red triangle goes beyond the virtual line.
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3. Click the Apply button.