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Step 4 – Camera Calibration

• Click on the New Page icon .

• Enter 2D view and first physically remove all reflective objects, such as the calibration kit or similar reflective equipment, from the measurement volume.

  • Go to the Camera settings sidebar on the right side of the 2D view. Click on Enable for Marker masks.

  • Click on “Auto-create” and start. QTM will mask all unwanted reflections. For manual masking options and advanced handling of camera settings and marker masks, please refer to the QTM Manual.

    

• Place the L-shaped calibration reference on the floor. (For running analysis, place it on the treadmill as shown below).

  Note the coordinate system must be set up so that the global x- or y-axis is pointing in the running direction or against the running direction:

  Note the coordinate system must be set up so that the global x- or y-axis is pointing in the running direction:

  

  Note: if you are not using a treadmill, make sure the x- or y-axis is parallel to the intended running direction.

• To calibrate, click on the calibration tool on the top menu bar.

  

• A window will open that will ask how long you would like to capture. 20-30 seconds is a sufficient amount of time for a standard full body volume. For large volumes, increase the time so that you have enough time to cover the complete volume that will be used.
• Click start and you will hear a bell. Using your calibration wand walk around the capture area and wave the wand in the area that the subject will be moving in. Note: for guidance how to move wand in the volume refer to QTM user manual in the section Making a measurement > Calibration of the camera system > Wand calibration method.
• Stop when you hear another bell.
• Confirm that the average camera residual is approximately 1-2 mm or under. Each camera should have collected at least 300 points. The standard deviation of the wand length should be 1-2 mm or better for a full body volume.