Skeletal Model
Posture Determination
Skin Model
Summary
This paper proposes a new approach for modeling of the human hand with dynamics considering the natural constraints of hand motion. The hand model consists of a skeletal model and a skin model.
The skeletal model is used to describe the posture of the hand. The natural constraints in the dynamics are dominated by an energy function of which parameters are calibrated by investigating the motion of a real hand. The joints in the skeletal model have virtual spring for each Degrees of freedom. The total hand posture is determined by an equilibrium state of forces which are generated from input, virtual springs and the energy function.
The skin model provides the hand surface shape fleshing the skeleton with a posture created by the dynamic model. The initial surface shape is constructed based on degitized 3D shape of a real hand. The contlrol points which are assigned to skeletal model drive deformation fo the skin model.
This model can be used to create hand animations. The natural hand postures and shapes can be generated even if only a few hand parameters are available. Reducing the number of parameters needed by the CG model, proposed system allows not only to decrease intricate works to assign postures and motion data sequences for hand CG animations but also to create life-like postures and motions easily.
Skeletal Model Posture Determination Skin Model