Difference between revisions of "Compass"
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To compensate the offset between real and estimated device orientation, the com-pass offset can be calibrated, by one of these three mechanisms: | To compensate the offset between real and estimated device orientation, the com-pass offset can be calibrated, by one of these three mechanisms: | ||
| − | + | * Manually specify the compass offset in the [[Settings]]. | |
| − | + | * Once the [[POI_View#Compass_calibration_button|Compass Calibration Button]] in the [[POI_View|POI View]] is clicked, the Compass will behave as if the current heading was north. | |
| − | + | * Once an [[AR-Marker]] used for device pose estimation is scanned, the Compass offset is automatically calibrated. | |
Revision as of 13:13, 19 September 2017
The Compass internally utilizes the accelerometer and magnetometer to estimate the device orientation in relation to the magnetic north. As the compass is vulnera-ble to external influences, it is recommended to disable the Compass in the pres-ence of strong magnetic fields.
Characteristics
- Provides orientation in world coordinate system.
- The error in orientation estimation is characterized by an offset between real and estimated device orientation. Typically an accuracy of 10-20° is achieved. In the presence of strong magnetic fields orientation estimation is unusable.
- Pose estimation suffers from noticeable jitter if Compass is used as the only orientation source.
- The orientation is updated with roughly 250Hz.
- Orientation estimation is not responsive and suffers from noticeable delays.
- Requires accelerometer and magnetometer.
Compass Calibration
To compensate the offset between real and estimated device orientation, the com-pass offset can be calibrated, by one of these three mechanisms:
- Manually specify the compass offset in the Settings.
- Once the Compass Calibration Button in the POI View is clicked, the Compass will behave as if the current heading was north.
- Once an AR-Marker used for device pose estimation is scanned, the Compass offset is automatically calibrated.
