In initialization stage of markers in a motion capture system

it needs to establish the correspondence between each marker and joint

which causes a fussy and heavy workload because it is usually carried out manually.To solve this problem

we proposed a reliable automatic marker initialization method.Firstly

we predefine the actors initial posture.Secondly a PCA algorithm is performed to analyze the bodys two principal axes.According to the definition of human skeleton model

the correspondences are established between markers and joints.And then the 3D positions of markers with joint information are reconstructed.Finally other viewing points can be initialized by projecting 3D position to each camera plane.Several experimental results demonstrate the proposed methods accuracy and efficiency.