Head tracking system with extended kalman filter combining absolute and relative navigation
US11995228B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2022 |
| Grant date | May 28, 2024 |
| Priority date | — |
| Expiry date | Aug 25, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30208
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method for head tracking for a head worn display (HWD) includes head-frame and platform-frame IMUs providing high-rate pose data of the wearer's head and a mobile platform. An optical tracker estimates an optical pose of a camera oriented at fiducials based on a comparison of 2D image data captured by the camera (and portraying the fiducials within the image) and the known location of each fiducial in a 3D marker frame. The pIMU also provides low-rate, high-integrity georeferenced pose data of the mobile platform (e.g., in an earth frame). The head tracker provides low-rate, high-integrity absolute head pose solutions (e.g., user head pose in the earth frame) based on the georeferenced pose data and current high-rate head/platform pose data, updating the absolute pose solutions with high-rate updates based on combined extended Kalman filter propagation of the high-rate head and platform pose data with refined optical pose data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.