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1. Go to the Perspective tab (1).
   
2. Set the With perspective settings checkbox checked(2).
3. Click the Stop button to stop playback in the viewing tile (3).
4. Specify the size of calibration object (in meters) in the Object size, m field (4).
5. Set the position of calibration objects on the video image in the viewing tile as follows:
1. Click the Add object button (5).
2. Position the object over the calibration object on the video image (6).

3. Correct the object size by dragging its edges using left mouse button.

   Info
   title Note.
   To delete an object click the  button next to it.

4. Repeat steps a-c for all calibration objects in the scene.
6. In the Width, m group set the maximum and minimum width of detected object (in meters) in the From (7) and To (8) fields (8).
7. In the Height, m group set the maximum and minimum height of detected object (in meters) in the From (9) and To (10) fields.
8. If required set points on the background as follows:
   1. Click the New point button (11).
   2. Position a point on the video image (12).
   3. Click the  button. The Position, m dialog box appears.

   4. Set the point position in meters and click OK (12).

      Info
      title Note.
      To delete a point click the  button next to it.

   5. Repeat steps аa-d for all required points.
9. To save the changes, click the Apply button.

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