Events & News
Computer Science Colloquium
| Category | Lecture |
| Date | Tuesday, May 13, 2008 |
| Time | 11:00 am |
| Location | GS 906 |
| Details | Light refreshments will be served at 10:45 AM in the 9th floor atrium. |
| Speaker | Ernesto Brau |
| Affiliation | Computer Science Dept, University of Arizona |
Camera Calibration with Virtual Alignment for a VR Environment
Tracking objects in 3D space is important to support virtual reality environments. This task can be achieved with the use of a calibrated and aligned multi-camera system. We present a method which, given a calibrated multi-camera system, aligns it to the coordinate system of the virtual world, as perceived by the user.
The process is as follows. We gather a set of 3D points by positioning a bright LED at perceived virtual locations corresponding to known virtual 3D locations. The LED is then identified in images from multiple cameras, and this data is used, together with the camera calibrations, to provide triangulated 3D positions of the LED. We then compute the similarity transformation between the triangulated points and the virtual 3D points to align the calibrated camera coordinate system with the perception of the visual reality coordinate system. We have successfully tested this method in a multi-camera environment, finding it to be accurate, as well as being more convenient and better motivated than aligning to the physical coordinate system.