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We explore the application of facial tracking to automated
re-animation. To this end, it is necessary to recover both head-pose
and facial expression from the facial movement of a performer.
However, both effects are coupled. This is a serious problem, which
previous studies haven't fully considered. The solution to this
interaction problem proposed here is to solve explicitly, at each
timestep, for pose and expression variables. In principle this is a
nonlinear inverse problem. However, appropriate parameterisation of
pose in terms of affine transformations with parallax, and of
expression in terms of key-frames, reduces the problem to a bilinear
one. This can then be solved directly by Singular Value
Decomposition. Thus actor-driven animation has been implemented in
real-time, at video field-rate, using two Indy desktop workstations.
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International Conference on Computer Vision '98
Bombay, India.
CDROM version produced at I I T, Bombay..