Egocentric mapping of body surface constraints

E Molla, HG Debarba, R Boulic - IEEE transactions on …, 2017 - ieeexplore.ieee.org
IEEE transactions on visualization and computer graphics, 2017ieeexplore.ieee.org
The relative location of human body parts often materializes the semantics of on-going
actions, intentions and even emotions expressed, or performed, by a human being.
However, traditional methods of performance animation fail to correctly and automatically
map the semantics of performer postures involving self-body contacts onto characters with
different sizes and proportions. Our method proposes an egocentric normalization of the
body-part relative distances to preserve the consistency of self contacts for a large variety of …
The relative location of human body parts often materializes the semantics of on-going actions, intentions and even emotions expressed, or performed, by a human being. However, traditional methods of performance animation fail to correctly and automatically map the semantics of performer postures involving self-body contacts onto characters with different sizes and proportions. Our method proposes an egocentric normalization of the body-part relative distances to preserve the consistency of self contacts for a large variety of human-like target characters. Egocentric coordinates are character independent and encode the whole posture space, i.e., it ensures the continuity of the motion with and without self-contacts. We can transfer classes of complex postures involving multiple interacting limb segments by preserving their spatial order without depending on temporal coherence. The mapping process exploits a low-cost constraint relaxation technique relying on analytic inverse kinematics; thus, we can achieve online performance animation. We demonstrate our approach on a variety of characters and compare it with the state of the art in online retargeting with a user study. Overall, our method performs better than the state of the art, especially when the proportions of the animated character deviate from those of the performer.
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