Abstract:Objective: Explore the accuracy of the multiplication coefficient method and the moment synthesis method for determining the spatial position of the center of gravity of the human body based on machine vision. Method: Build a mechanical measurement platform, design the three-dimensional center of gravity measurement methods of the human body under static and dynamic conditions, and calculate the space coordinates of the center of gravity. Through experiments, the calculation accuracy of multiplication coefficient method and moment synthesis method is studied and analyzed. Results: In the static experiment, the calculation results of the torque synthesis method are more accurate than the multiplication coefficient method in each dimension; in the dynamic experiment, the average error and relative error of the torque synthesis method in the X or Y direction are higher than that of the multiplication coefficient method. The multiplication coefficient method should be small, and the action decomposition method is used to analyze the height direction of the center of gravity of the Z axis. The final rendering effect of the torque synthesis method is better. Conclusion: The calculation accuracy of the three-dimensional center of gravity by the moment synthesis method is higher, which is closer to the measurement data of the mechanical measurement platform. The three-dimensional center of gravity calculated by the moment synthesis method can basically replace the mechanical measurement platform and be used in subsequent further research.