Stretchable Cartoon Editing for Skeletal Captured Animations

彬彬

1 Introduction

In this work, we describe a new and simple approach to re-use

skeleton of animation with joint-based Laplacian-type regularization,

in the context of exaggerated skeleton-based character animation.

Despite decades of research, interactive character animations

still have a lack of flexibility and editability in order to re-use real

vertebral motion. In further details, generation of expressive cartoon

animation from real data, is a challenging key task for nonphotorealistic

animation. Hence, a major problem for artists in production

is to enhance the expressiveness of classical motion clips

by direct manipulation of the underlying skeletal structure. Relatively

small number of researchers present their approach for processing

cartoon effects on motion data in [Kwon and Lee 2007;

Davis and Kannappan 2002; Bregler et al. 2002]. However existing

techniques often avoid dealing with the potential of skeletal-based

optimization, while preserving the joint coherence and connectivity.

Besides, the majority of characters in cartoons have the flexibility

to stretch to extreme positions and squash to astounding shapes. It

can also be noticed that squash-and-stretch is easier to realize in

traditional animation rather than mocap-based computer generated

animation. For this reason, Ratatouille a Pixar

R movie, did not use

a rigid skeleton, while abandoning motion capture to reach such essential

non-ultra realistic appeal.

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