The process of kinematic measurement of human gait includes five steps: image acquisition, camera calibration, joint marker detection, 3D coordinate reconstruction of the marker centers in space, and computation and output of kinematic parameters and graphs.

This paper describes the camera calibration algorithm which is needed when given only the center-to-center distance between adjacent CCD sensor elements in the vertical distance.

Whether sufficient or not the meteorological preparation is,it not only affects the precision and accuracy of the firing data of cannon, but also decides the fire for effect of cannon.