Difference between revisions of "Camera Calibration"

Revision as of 07:19, 10 July 2018

Camera calibration needs to be done once per device model, for features requiring depth estimation (e.g. AR-Markers). Currently the following device models are calibrated:

If your device is not yet calibrated, contact the development department. If calibration can´t be done by the development department follow the steps outlined in the following section.

Calibration Procedure

• Download and the camera calibration application from the release portal.
• Print the asymmetrical circle calibration pattern from the release portal.
• Verify the correct size by measuring the reference length on the upper right corner.
• Mount the calibration pattern on a planar surface.
• Install and open the Camera Calibration application.
• Target the calibration pattern with the camera (the pattern gets augmented --> check if the augmentation is placed at the center of the circles before taking a calibration screenshot).
• Tap on the display to mark a frame for calibration.
  • The calibration pattern should take up aus much of the camera view as possible.
  • Keep the camera and calibration pattern stable to not introduce blur.
  • Take calibration frames from different viewpoints.
  • Circles of the calibration pattern should also be in the corners of the camera view.
  • Take as much calibration frames as possible (at least 30).
• After having enough calibration frames, open the menu and press calibra-tion.
• A toast indicates that calibration was done and shows the reprojection er-ror. This error should be as low as possible (lower than 3).
• The camera matrix and distortion coefficients are now saved on the device in the Downloads folder. The device name is used as the filename of the textfile.
• Forward the calibration file to the development department.

Camera Calibration Application (WinX)

Camera Calibration Result (WinX)