The main objective of the Lens & Tracking Calibration Tool is to generate a Lens Profile as well as an align the tracking system.
Additional this tool can position/align screens within the correct 3D location/orientation.


Add the Lens & Tracking Calibration tool

Once everything has been setup and the camera object is linked properly to the incoming data, the Lens Calibration process can begin.

Go to the camera object, and under the Tools tab, add a new tool under the Calibration folder. Depending on the different situation, a different tool can be used. For more information, click here.

Click on the icon to open the Calibration Wizard window.

Tracking Modes

There are different Calibration modes available depending on the situation with the tracking system and the setup.

Name Description Tracking System
Full Tracking This mode is mainly used for a camera that can be tracked as it moves to different locations in the venue. 6DoF Tracking System
Pan Tilt This mode is mainly used for Pan Tilt Head like PTZ cameras or encoder based fluid head pedistals. Protocols only deliver Pan/Tilt or Pan/Tilt raw encoder values
Rotation Only static This mode is mainly used for a camera that is on a tripod / pedistal and would only be rotating on top of a fixed location 6DoF Tracking System or 3DoF rotation only Systems
Rotation Only non-static Like “Rotation Only Static” but can change the location between observation if the distance to screen needs to be increased during the calibration 6DoF Tracking System or 3DoF rotation only Systems

Start Calibration

Before capturing any images for observations, it is important to ensure that the majority of the markers can be detected properly by the system.

  • If a marker is visible by the system cannot pick it up as a valid marker, there will be no overlay drawn ontop if it. From the capture window, you would just see the marker itself.
  • When a valid marker is picked up by the system, an overlay would be drawn over the marker showing the ID of the marker with a colored background.
  • When a marker is picked up by the system but it does not match the ones that should be in the associated calibration screen, an overlay would be drawn over the marker but with a greyed out background.

Multiple images would need to be captured for the same Zoom and Focus step. Therefore, before you are ready to move to the next zoom/focus step, it is important that the zoom / focus values stay the same during the entire period.

To capture an image click on the icon:

Once an image has been captured, it would appear on the left hand side of the Calibration Wizard window.
Repeat the capturing process until the entire image sensor of the camera has been covered.

Move the camera to multiple locations within the tracking space to capture different locations as well as different rotations from the system.

Run Calibration

When a good distribution has been achieved, it is a good idea to run the calibration process now and look at the error margin. To do so, press the icon.

After the calibration is completed, an error margin number would be displayed on each of the captured image. Also, an overall error would be given to a specific zoom/focus step.

If the error is higher than expected, try the following steps:

  • review the already captured images and see if some are extremely high. If so, disable them and run the calibration again.
  • capture more images at different angles / positions.
  • check if the tracking system is deliver “clean” data.

For more details of how to understand the calibration results, please refer to the Observations view.

Continue with different zoom and/or focus step

Simply change zoom and/or focus to the next needed calibration values and continue capturing images.