Geometric calibration of head-worn multi-camera eye tracking system
US8957948B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 2011 |
| Grant date | Feb 17, 2015 |
| Priority date | — |
| Expiry date | Nov 3, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/014
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and methods for geometric calibration and use of head-worn multi-camera eye tracking system are provided. The system calibrates the internal and external parameters of the cameras as well as the parameters of a compact geometric model of the human eye. An exo-camera determines a relative pose with regard to a computer monitor and endo-cameras determine the eyeball position and orientation. An endo-exo calibration and an endo-eye calibration each with an optimization step are included. A homography and a joint optimization step are also provided. A single point calibration re-establishes calibration. The system in operational mode determines a user's gaze direction to perform a computer input function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.