Documentation for Axxon One 2.0. Documentation for other versions of Axxon One is available too.

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Perspective configuration enhances the performance of the detectors and allows you to estimate the real size of objects based on a simplified calibration system.

Attention!

Correct operation of object calibration isn't possible if you use a camera with strong perspective distortion (for example, fisheye).

To configure perspective, do the following:

  1. Select the Object tracker.

  2. In the settings of the Object tracker (see Configuring the Object tracker):
    1. Select the Yes value for the Object calibration parameter.
    2. In the Leveling rod height parameter, enter the height of the calibration object on the video image in decimeters.
  3. In the preview window, click the button.
  4. Visually specify the size of the same object in different parts of the frame:

    • To create a leveling rod, add two anchor points by left-clicking the video image. 

    • Set at least three leveling rods. The lower anchor points of any three rods must not be located on the same line (horizontal, vertical, slanting, and so on).

    • You can resize the rod by stretching its anchor points , and move it on screen using drag-and-drop.

    • Rods must be exactly the same size as the object, which serves as a template for a leveling rod. For example, a person's height can serve as a template:

      Attention!

      When you configure leveling rods, the following requirements must be met:

      1. rods must be evenly distributed throughout the frame: the larger area they cover, the more accurate the calibration;
      2. rods that are equally distant from the camera lens must be the same size;
      3. all bases of the rods must be on the same plane (for example, floor);
      4. in complex scenes, we recommend adding more than three rods, but no more than 10-15 rods per frame.

      Note

      • For convenience of configuration, you can "freeze" the frame. Click the button. To cancel the action, click this button again.
      • To delete a rod, click the button.
  5. Click the Apply button . To cancel the changes, click the Cancel button.

Perspective is now configured. These settings will apply for all sub-detectors of the Object tracker.

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