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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).

   Info
   title Note
   To resume playback, click the Resume playback button.

   
   

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:

   Info
   title Note.
   Zoom in on the video preview field for more precise positioning of calibration objects. To do that, right-click the video preview while holding the Shift key on the keyboard. The video opens in a separate window, which can be resized by dragging its borders. Close this window after adding all required objects.

   
   

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. To save the changes, click the Apply button.

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