Camera Calibration

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:

Device Model	Operating System
Getac Z710	Android
Sony SGP611	Android
HTC One m7	Android

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

Calibration Procedure

    1.	Download and the camera calibration application from the release portal (link)
    2.	Print the asymmetrical circle calibration pattern from the release portal (link).
    3.	Verify the correct size by measuring the reference length on the upper right corner.
    4.	Mount the calibration pattern on a planar surface.
    5.	Install and open the Camera Calibration application.
    6.	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).
    7.	Tap on the display to mark a frame for calibration.
            a.	The calibration pattern should take up aus much of the camera view as possible.
            b.	Keep the camera and calibration pattern stable to not introduce blur.
            c.	Take calibration frames from different viewpoints.
            d.	Circles of the calibration pattern should also be in the corners of the camera view.
            e.	Take as much calibration frames as possible (at least 30).
    8.	After having enough calibration frames, open the menu and press calibra-tion.
    9.	A toast indicates that calibration was done and shows the reprojection er-ror. This error should be as low as possible (lower than 3).