Documentation for Axxon PSIM 1.0.0-1.0.1.

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A cross line detection tool is a VMDA detection tool that is triggered when an object crosses a virtual line in the camera's field of view.

To configure a cross line detector, do the following:

  1. Go to the VMDA detection object settings panel.
  2. Select a line type (straight or polyline) the crossing of which leads to a detector triggering.
    1. If a detector is to trigger while crossing a straight line, click the Add line button (2).
    2. If a detector is to trigger while crossing a polyline, click the Add polyline button.

      Note

      Only one line can be added. The first line will be deleted if there is an attempt to add a second one.  

  3. In the Video preview field (3), set the end points of the line, by clicking left mouse button, which crossing leads to a detector triggering.

  4. Make the necessary operations with a line.

    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  symbol. Available object types:

    1. Any object. Detector triggers when the line is crossed by any object.
    2.  A human. Detector triggers when the line is crossed by an object which width is less than height.

    3.  Vehicle. Detector triggers when the line is crossed by an object which width is greater than height.

      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.

      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  icon. The color picker palette will open. Circle the required color range with the left mouse button.

    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 the left mouse button upon one of the arrows to ignore crossing in one of the directions. The arrow will be colored gray.

    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 line crossing will be detected regardless of 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).

    Attention!

    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.

    Note

    It is necessary to set at least one direction of the object's movement across the line. If both directions of movement are set, the detection tool will be triggered when the object crosses the line in any direction.

  8. By default, the detection tool is triggered if the line is crossed by the lower part of the object. In this case, the object is considered a rectangle (a rectangular frame around a real object), roughly divided into the following parts:

    You can change the part of the object that must cross the line for the detection tool to be triggered. To do this, in the Response area (4), set the required check box: left, right, top (upper), bottom (lower) part of the object or any point of the object.

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

  10. 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 Show event on screen checkbox (6).
  11. 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.

  12. To save the changes, click the Apply button (8).

    Note

    To clear the preview field from a visual element (a line), click the Clear button (9).

A cross line detector is configured.

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