Weighted Pose Space Editing for Facial Animation

Yeongho Seol, Jaewoo Seo, Paul Hyunjin Kim, J. P. Lewis, Junyong Noh
Journal : The Visual Computer: Volume 28, Issue 3 (2012), Page 319-327

Paper (1.18M PDF)


Abstract

Blendshapes are most commonly used by animators to produce facial animation in production. Typically, the animators begin with a relatively small number of blendshapes, encounter a limit on expressiveness, then sculpt additional blendshapes to achieve the animation goal. To make this additional sculpting process much more efficient, we present a novel editing method for blendshape based facial animation. Based on the delta formulation of blendshape, additional sculptings on already keyframed animation train a Radial Basis Functions (RBF) network with the Gaussian kernel for each vertex. Using this technique, the artist's sculpting on a problematic expression is automatically applied to similar expressions in an entire sequence, and indeed all future sequences. The amount of editing effect is easily controllable and the effect is smoothly propagated through the surrounding frames of the similar expressions. We applied this technique to facial animation sequences that require the editing of further sculpting. In addition, we present a search scheme that allows effective reuse of pre-sculpted editing examples. Our system greatly reduces time and effort required by animators to create high quality facial animations.