Overlay

Augmented reality

Fiducial marker

Pedagogy

Mathematics

Multimedia

Virtual image

Optical head-mounted display

Computer graphics (images)

Statistics

Calibration

Artificial intelligence

Psychology

Tracking (education)

Virtual reality

Programming language

Videoconferencing

Computer science

Computer vision

We describe an augmented reality conferencing system which uses the overlay of virtual images on the real world. Remote collaborators are represented on virtual monitors which can be freely positioned about a user in space. Users can collaboratively view and interact with virtual objects using a shared virtual whiteboard. This is possible through precise virtual image registration using fast and accurate computer vision techniques and head mounted display (HMD) calibration. We propose a method for tracking fiducial markers and a calibration method for optical see-through HMD based on the marker tracking.

Marker tracking and HMD calibration for a video-based augmented reality conferencing system