BAP Generation for Head Movement based on MPEG-4 SNHC

They used 3-D cylinders as primitives to construct a synthetic human body model. Their model consists of 10 joints and total 22 degree of freedom (DOF), as shown in Fig. 1. However, this model has limited extensibility because it is operated only in their system. In other words, the model should be integrated before the system starts, because BAPs are calculated according to the preintegrated model. In addition, the number of DOF is small compared to 186 DOF in the MPEG-4 SHNC FBA standard. In this paper, we construct a VRML parser to get an arbitrary human body model for extensibility. In this paper, we propose a body animation parameter generation system for global head movement using head motion analysis and tracking. The proposed system consists of two separate layers: head motion analysis layer and 3-D model registration layer. Following the MPEG-4 SNHC standard, we generate the global head motion using body definition and animation parameters. In the implemented system, we acquire head motion data from a single camera and extract body definition parameters from an arbitrary VRML human model.