Deformable model fitting by regularized landmark mean-shift

JM Saragih, S Lucey, JF Cohn - International journal of computer vision, 2011 - Springer
International journal of computer vision, 2011Springer
Deformable model fitting has been actively pursued in the computer vision community for
over a decade. As a result, numerous approaches have been proposed with varying
degrees of success. A class of approaches that has shown substantial promise is one that
makes independent predictions regarding locations of the model's landmarks, which are
combined by enforcing a prior over their joint motion. A common theme in innovations to this
approach is the replacement of the distribution of probable landmark locations, obtained …
Abstract
Deformable model fitting has been actively pursued in the computer vision community for over a decade. As a result, numerous approaches have been proposed with varying degrees of success. A class of approaches that has shown substantial promise is one that makes independent predictions regarding locations of the model’s landmarks, which are combined by enforcing a prior over their joint motion. A common theme in innovations to this approach is the replacement of the distribution of probable landmark locations, obtained from each local detector, with simpler parametric forms. In this work, a principled optimization strategy is proposed where nonparametric representations of these likelihoods are maximized within a hierarchy of smoothed estimates. The resulting update equations are reminiscent of mean-shift over the landmarks but with regularization imposed through a global prior over their joint motion. Extensions to handle partial occlusions and reduce computational complexity are also presented. Through numerical experiments, this approach is shown to outperform some common existing methods on the task of generic face fitting.
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