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Configuring the parameters

To create the Line crossing detector, do the following:

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

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

If necessary, you can change the detector 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 ignore areas (see Configuring the ignore area).

To save the parameters of the detector, click the Apply Image Added button. To cancel the changes, click the Cancel Image Added button.

Configuring a virtual line

To configure a virtual line, do the following:

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

      Info
      title Note
      The

After you create and select a line crossing detection tool, you can see a virtual "tripwire" line in the FoV. 

To set up line crossing detection, do the following:

Set up a virtual line in FoV.

Set the end points of the line Image Removed.
Image Removed

Info

title	Note

When the line is being constructed, the

1. 1. end points are connected by a two-color

dotted

2. 1. dashed line. The

direction

3. 1. directions of

the object's motion across

4. 1. object movement through the line

is

5. 1. are indicated by dotted arrows. For convenience of configuration, you can "freeze" the frame. Click the Image Added button. To cancel the action, click this button again. To hide the virtual line, click the Image Added button. To cancel the action, click this button again.

      Action	Result

Position

6. 1. Hover the cursor

on an

7. 1. over the end point and, holding down the left mouse button, move the mouse

Moves

8. 1. Moving the

line

9. 1. end point of a line

Position

10. 1. Hover the cursor

on

11. 1. over the line and, holding down the left mouse button, move the mouse

       Moving the line

    2. By default,
Line crossing detection monitors object motion across the line in both directions. To suspend detection of motion in one
12. 1. both directions of object movement through the line are detected. To stop the detection in the required direction, click the
button Image Removed to that
13. 1. Image Added button corresponding to this direction.
       

       Note
       title Attention!

At

14. 1. You must select at least one direction

must be selected

15. 1. for detection.

Info

title	Note

16. 1. An unmonitored direction of object

motion

17. 1. movement is indicated by a dimmed arrow.

If an object in FoV performs repetitive movements

18. 1. Image Added

19. In the frame, there can be situations when one and the same object frequently moves near the virtual line,
it may cause excessive triggering of the detection tool
20. which can cause the generation of excessive events. In this
case, set an area within
21. situation, we recommend specifying the area of the object
's track which must cross
22. track that completely crosses the line
completely
23. to
trigger the tool. To do it, set the X and Y offset values as percentage of track width and height.
Image Removed
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.
Image RemovedClick the Apply button
24. receive an event from the detector. For this, in the detector 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 the parent detector below which the Line crossing detector is created. For example, Neural tracker 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 is generated only if the red rectangle completely crosses the line.
       Image Added
    2. The Wallcamera position:
       For example, the green rectangle is the object track. If the X-axis offset is set to 30%, an event is generated only if the red segment completely crosses the line.
       Image Added
       
25. Click the Apply button. Click the Cancel button to cancel the changes.

Configuration of the Line crossing detector is complete.