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A human body is represented by an articulated object model which consists of several solid body objects. A solid object corresponds to a part of the human body and has a joint to the adjacent body object. The body objects are connected to each other in a tree structure. According to the tree graph structure, pose of one body object is defined directly by the joint angles that is a attribute of the joint connecting it to a parent body object in the tree. A joint has at most 3 axes to rotate. Joint angles of the body object i at time t are expressed by a vector . The subscript k means the axis of the joint rotation. The minimum and maximum joint angle are defined so that a human model does not come to an unrealistic pose. Figure 4 shows a human body model consisting of nine parts. The pelvis corresponds to the root body object. Black dots on the model represents the joints. For example, a joint of the head body part locates near the mouth in the figure. Dotted lines denotes the tree structure of this model.
In this way, the motion is defined by the time varied angles of all the joints for a certain period.
Figure 3: Frame Skip ,Figure 4: Human Body Model