Calibration system and method for magnetic tracking in virtual reality systems
US10962609B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2018 |
| Grant date | Mar 30, 2021 |
| Priority date | — |
| Expiry date | Dec 20, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/011
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems and methods are provided for calibrating electromagnetic position tracking systems commonly used in virtual reality systems by compensating for steady state magnetic field distortions that can occur within a tracking volume and distort magnetic sensor readings. The calibration system includes a calibration device that holds magnetic sensor(s) in a fixed position relative to a reference position sensor object provided on the calibration device. The calibration data collection process includes positioning the calibration device at multiple locations within a tracking volume and measuring magnetic position readings using a magnetic tracking system and a corresponding reference position using the reference position tracking system. The calibration data is then algorithmically processed using a data processor to generate a magnetic distortion correction function for adjusting the magnetic tracking system measurements based on a known position of said sensors, which is determined from the measured position of the reference tracking object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.