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

To configure a cross line detector, do the following:

1. Go to the the VMDA detection object 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 the Add line button  button (1).
   2. If a detector is to trigger while crossing a polyline, click the the Add polyline button  button (2).
3. In the the Video preview field  field (4), set the end point points of the line, by clicking left mouse button, which crossing leads to a detector triggering.
   Image ModifiedImage Modified

4. Make the necessary operations with a line. Line The 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
   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 Image Removedthe Image Added symbol. Available object types are:

   1. Image Removed Image AddedAny object. Detector  Detector triggers when the line is crossed by any objectImage Removed 
   2. Man. Detector Image Added A human. Detector triggers when the line is crossed by a manhumanImage Removed 

   3. Image AddedVehicle.

       Detector

       Detector triggers when the line is crossed by a vehicle

      Info
      title Note.
      Detection of the following object types can be configured using scripts and registry keys: a human, a group of humans (with a possibility to count the number of people in a group), cara vehicle, noise, an object carried into the area, an object carried out of the area, other objects. See also CAM_VMDA_DETECTOR section of the Programming Guide.. More precise objects classification can be performed using the neural filter (see Configuring the neural filter).

      
      

6. To set the object color to be triggered by the detector, click the Image Added icon. The color picker palette will open. Circle the required color range with the left mouse button.
   Image Added

   To reset the selected color range to the default value, right-click in the palette area.

7. Set the object trajectory by

   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.

   Approximate

   Info
   title Note
   When just added, the arrow has minimum length.

   
   The approximate speed of detected objects is displayed

   close to

   near the arrow.

   It is possible to change value of

   Change the speed by

   changing arrow length moving arrowhead

   moving the arrow head with pressed left mouse button and changing the arrow length. The detection tool

   alarm triggers

   is triggered when an object crosses the line in the selected direction with a speed that is

   less than shown near the arrow. The detection tool alarm is not registered when the object crosses the line if the speed is greater than shown. At minimal and maximal

   approximately the same as the specified speed. At minimum and maximum value of speed the "?" sign will display and the fact of

   cross

   line crossing will be detected regardless of

   speed will be detected

   the speed.
   In order for the detection tool to be triggered when object speed is less than the specified speed, specify the id of the detection tool in the VMDA.useSpeedLimitTypeLessThan parameter (for details on the key, see Registry keys reference guide).
   In order for the detection tool to be triggered when object speed is greater than the specified speed, specify the id of the detection tool in the VMDA.useSpeedLimitTypeMoreThan parameter (for details on the key, see Registry keys reference guide).

   Info
   title Note
   For more information about working with the registry, see Working with Windows OS registry.
   Arrow has minimal length while adding.

   Image Removed

   
   

   Note
   title Important!
   The same VMDA detector id can only be specified for either the VMDA.useSpeedLimitTypeLessThan or the VMDA.useSpeedLimitTypeMoreThan parameters. The simultaneous operation of both these parameters for the same VMDA detector is not allowed.

   
   Image Added

   Info
   title Note.
   It is necessary to set at least one object’s object direction across the line.

   
   

   Info
   title Note.
   If both directions are set, the detector will trigger at line crossing by an object in any direction.

   
   

8. If the alarm is to

   Set the Generate alarm on camera checkbox (5), if the camera alarm should be generated when the detector triggers

   , set the Generate alarm on camera checkbox (5)

   .

9. To save the changes, click

   the Apply

   the Apply button (6).

   Info
   title Note

...

...

1. To clear the preview field from a visual

...

1. element (a line), click

...

1. the Clear button (3).

   
   

A cross line detector is now configured.