Difference between revisions of "Camera Calibration"
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== Calibration Procedure == | == 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. | |
| − | + | ||
Revision as of 13:24, 19 September 2017
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 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.
