Difference between revisions of "Compass"
(→Compass Calibration) |
|||
| Line 16: | Line 16: | ||
• Manually specify the compass offset in the [[Settings]]. | • Manually specify the compass offset in the [[Settings]]. | ||
| − | • Once the Compass Calibration Button in the [[POI_View|POI View]] is clicked, the Compass will behave as if the current heading was north. | + | • 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. | • Once an [[AR-Marker]] used for device pose estimation is scanned, the Compass offset is automatically calibrated. | ||
Revision as of 11:50, 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.
