This paper proposes a novel approach to motion capture
from multiple, synchronized video streams, specifically
aimed at recording dense and accurate models of the structure
and motion of highly deformable surfaces such as skin,
that stretches, shrinks, and shears in the midst of normal facial
expressions. Solving this problem is a key step toward
effective performance capture for the entertainment industry,
but progress so far has been hampered by the lack of
appropriate local motion and smoothness models. The main
technical contribution of this paper is a novel approach to
regularization adapted to nonrigid tangential deformations.
Concretely, we estimate the nonrigid deformation parameters
at each vertex of a surface mesh, smooth them over
a local neighborhood for robustness, and use them to regularize
the tangential motion estimation. To demonstrate
the power of the proposed approach, we have integrated it
into our previous work for markerless motion capture [9],
an...