Abstract: In conventional methods of physics based character animation, human model are approximated by the rigid body models. However, the human body parts are not as easily described as rigid bodies with defined joints and inflexible geometry, daily varying mass, etc. A body segment parameter optimization method based on the force plate data and motion capture data was proposed. This method optimized the body segment parameter iteratively using the Lagrange constraints based on the contact information and motion capture data. Different subjects took part in the motion capture process with various kinds of motions. A comprehensive evaluation was done for the optimization of body segment parameter. The results show that the optimized body segment parameter is consistent with the biomechanics literature and the result can decrease the noise information in the motions.

Key words: body segment parameter, dynamic data, biomechanics valid, iterative optimization, character animation