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A cross line detector detection tool is a VMDA detector detection 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 Any Image Added Any object. Detector  Detector triggers when the line is crossed by any objectImage Removed Man. Detector
   2. Image Added A human. Detector triggers when the line is crossed by a manImage Removed Vehicle. Detector an object which width is less than height.

   3. Image Added Vehicle. Detector triggers when the line is crossed

      by a vehicle

      by an object which width is greater than height.

      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), a vehicle, noise, an object carried into the area, an object carried out of the area, other objects. See also CAM_VMDA_DETECTOR VMDA detection section of the Guide for creating scripts (programming). 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. By default, the detection tool triggers on line crossing in both directions. Click

   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

   arrows to ignore crossing in one of the directions. The arrow will be colored

   white.Approximate speed of detected objects when the detector triggers is displayed close to arrow. At minimal and maximal

   gray.

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

   
   The approximate speed of detected objects as a percentage of the frame per second is displayed near the arrow. Change the speed by moving the arrow head with pressed left mouse button and changing the arrow length. The detection tool is triggered when an object crosses the line in the selected direction with a speed that is 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. It is possible to change value of speed by changing arrow length moving arrowhead with pressed left mouse button

   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.
   Arrow has minimal length while adding.

   Image Removed

   For more information about working with the registry, see Working with Windows OS registry.

   
   

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

   
   

   Info
   title Note.
   If If both directions are set, the detector will trigger at any 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.

9. To display the tracks of objects detected by the cross line detection tool regardless of whether the corresponding setting of the Tracker object is enabled, set the Generate alarm on camera checkbox (5) Show event on screen checkbox (6).
   
10. If the video in the preview window is too distorted, set the Show actual video aspect ratio checkbox (7). In this case, the video may not occupy the entire area of the preview window.

11. To save the changes, click

    the Apply

    the Apply button (

    6

    8).

    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.