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Issue No.01 - First Quarter (2013 vol.6)
pp: 106-116
S. Mulatto , Dipt. di Ing. dell'Inf., Univ. degli Studi di Siena, Siena, Italy
A. Formaglio , Dipt. di Ing. dell'Inf., Univ. degli Studi di Siena, Siena, Italy
M. Malvezzi , Dipt. di Ing. dell'Inf., Univ. degli Studi di Siena, Siena, Italy
D. Prattichizzo , Dipt. di Ing. dell'Inf., Univ. degli Studi di Siena, Siena, Italy
ABSTRACT
A technique to animate a realistic hand avatar with 20 DoFs based on the biomechanics of the human hand is presented. The animation does not use any sensor glove or advanced tracker with markers. The proposed approach is based on the knowledge of a set of kinematic constraints on the model of the hand, referred to as postural synergies, which allows to represent the hand posture using a number of variables lower than the number of joints of the hand model. This low-dimensional set of parameters is estimated from direct measurement of the motion of thumb and index finger tracked using two haptic devices. A kinematic inversion algorithm has been developed, which takes synergies into account and estimates the kinematic configuration of the whole hand, i.e., also of the fingers whose end tips are not directly tracked by the two haptic devices. The hand skin is deformable and its deformation is computed using a linear vertex blending technique. The proposed synergy-based animation of the hand avatar involves only algebraic computations and is suitable for real-time implementation as required in haptics.
INDEX TERMS
Joints, Avatars, Kinematics, Thumb, Haptic interfaces, Indexes, Humans,hand avatar, Haptics, postural synergies
CITATION
S. Mulatto, A. Formaglio, M. Malvezzi, D. Prattichizzo, "Using Postural Synergies to Animate a Low-Dimensional Hand Avatar in Haptic Simulation", IEEE Transactions on Haptics, vol.6, no. 1, pp. 106-116, First Quarter 2013, doi:10.1109/TOH.2012.13
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