Configuring Line crossing

Configuring detection tool

To configure the Line crossing, do the following:

1. Create the required detection tool and specify its parameters (see Configuring detectors and their sub-detectors).
2. Below the created detection tool, click Create… → Line crossing.

By default, the detection tool is enabled and set to generate events when an object crosses a virtual line.

If necessary, you can change the detection tool parameters. The list of parameters is given in the table:

By default, the entire frame is a detection area. If necessary, in the preview window, you can set one or more skip areas (see Configuring a skip area).

To save the parameters of the detection tool, click the Apply  button. To cancel the changes, click the Cancel  button.

Configuring virtual line

To configure a virtual line, do the following:

1. In the preview window:
   
   1. Specify the end points of the line :
      
      

      Note

      • The end points are connected by a two-color dashed line. The directions of object movement through the line are indicated by dotted arrows.
      • For convenience of configuration, you can "freeze" the frame. Click the  button. To cancel the action, click this button again.
      • To hide the virtual line, click the button. To cancel the action, click this button again.

      Action	Result
      Hover the cursor over the end point and, holding down the left mouse button, move the mouse	Moving the end point of a line
      Hover the cursor over the line and, holding down the left mouse button, move the mouse	Moving the line

   2. By default, both directions of object movement through the line are detected. To stop the detection in the required direction, click the button corresponding to this direction.
      

      Attention!

      • You must select at least one direction for detection.
      • An unmonitored direction of object movement is indicated by a dimmed arrow.
        
2. In the frame, there can be situations when one and the same object frequently moves near the virtual line, which can cause generation of excessive events. In this situation we recommend specifying the area of the object track that completely crosses the line to receive an event from the detection tool. For this, in the detection tool parameters, specify the X-axis and Y-axis offsets as a percentage of the track area width and height.
   Configuration of the X-axis and Y-axis offsets depends on the Camera position parameter of a detection tool below which the Line crossing detection tool is created. For example, Neurotracker has the Camera position parameter (see Configuring the Neural tracker).
   1. The Ceiling camera position:
      For example, the green rectangle is the object track. If the X-axis and Y-axis offsets are set to 25%, an event will be generated only if the red rectangle completely crosses the line.
      
   2. The Wall camera position:
      For example, the green rectangle is the object track. If the X-axis offset is set to 30%, an event will be generated only if the red segment completely crosses the line.
      
      
3. Click the Apply button. Click the Cancel button to cancel the changes.