A cross line detector is a VMDA detector that triggers when the trajectory of an object that is in the camera coverage and crosses a virtual line.

To configure a cross line detector, do the following:

  1. Go to the settings panel for a VMDA detection object.
  2. Select a line type (straight or polyline) the crossing of which leads to a detector triggering. Only one line can be added. The first line will be deleted if there is an attempt to add a second one. 
    1. If a detector is to trigger while crossing a straight line, click the Add line button (1).
    2. If a detector is to trigger while crossing a polyline, click the Add polyline button (2).
  3. In the Video preview field ( 4), set the end point of the line, by clicking left mouse button, which crossing leads to a detector triggering.

  4. Make necessary operations with a line. Line operations are shown in the table.

    Operation

    Result

    Left mouse click in the video surveillance window

    Creation of a line’s end point

    Hover to an end point and holding the left button pressed move the mouse

    Shift of a line’s end point.

    When the size of the line is changed, the size of the arrow (that set the object’s direction across the line) is changed too (see item 6). The size of the arrow defines the speed of detected objects: the longer the arrow, the higher the speed is and vice versa.

    Hover to an end point and click the right mouse button

    A line’s deletion

  5. To select object type for which the detector will be enabled, click the  symbol. Available object types are:

    1.  Any object. Detector triggers when the line is crossed by any object
    2.  Man. Detector triggers when the line is crossed by a man
    3.  Vehicle. Detector triggers when the line is crossed by a vehicle

  6. By clicking the left mouse button upon one of the grey arrows, set the object’s direction across the line by which the detector will trigger. The arrow will be colored white.

     It is necessary to set at least one object’s direction across the line.
     If both directions are set, the detector will trigger at any line crossing by an object.
  7. If the alarm is to be generated when the detector triggers, set the Generate alarm on camera checkbox (5).
  8. To save the changes, click the Apply button (6).
 To clear the preview field from a visual elemnt (line), click the Clear button (3).

A cross line detector is now configured.