MixTV is a system for tracking special patterns in a
camera image, so that virtual objects can be overlaid on these patterns.
This allows a presenter to pick up a virtual object.
The software analyses the camera image to determine
the position of coloured marker objects. This is done in several steps:
1
Chroma-key is used to separate the marker
from the background.
2
Edge and corner detection precisely locate the position
of the markers in the image
3
The binary grid code is read to uniquely identify
the markers.
4
Mathmatical calculations convert the image position
to a 3D world position.
MixTV has been
used in the BBC Three programme Body Hits.
It was also used
in the BBC General Election Coverage 2005 and is being investigated
for use in the Digital Curriculum.
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