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With the development of the motion capture technology, abundant realistic human motion capture data have been widely used in many areas of the computer screen making. Tracking, capturing and analyzing human motion, we can further study each link of the athlete action techniques to help the quantitative analysis. Meanwhile, combined with human physiology and sports biomechanics, the training methods can be improved. Therefore, the movement training doesn’t depend on experience, instead, comes into a theorized and digital age. The constraint-based editing techniques, which alter motions, preserve specific spatial features. This paper researches the basic theory of human motion editing and describes the motion techniques of the human hierarchical joint model. On the base of researching the key frame editing and processing method, a small motion editing system can be formed by using Matlab tool to achieve various technical simulations. Introduction With computers increasingly widely used in all of life, the computer animation comes into sports field. Although motion capture technology can capture realistic human motion date, yet various motion types, complex body structure and many other reasons request us to deal with the capture data. Then we can find useful date, which makes motion editing techniques become an important research subject, The main feature of the constraint-based motion editing algorithm is that, in the editorial process, some characteristics of the motion data and the requirement of the customers are constrained and preserved. The constraintbased editing methods are combined with the inverse kinematics and the users set different constraints to generate new motions. The users don’t have to be too much involved in the whole process. This kind of operation is mainly used in motion transformation. In making motion pictures, the constraint-based motion editing has a broad prospect of application and great practical value of improving athlete performance and providing scientific training data. The description of human movement model Before editing the athlete action, it is necessary to establish an appropriate body model. If the body model is too simple, some important movement detail information will be lost; it is too complex, it will increase the application and the solving difficulty. There is a common skeleton model used in the computer animation of the human hierarchical skeleton model, which is formed on the basis of the analysis of baby skeleton structure and makes it simply simulated. Using this model not only helps to control the action, but also reflects the characteristics of sports information. The body skeleton structure is described by the hierarchical skeleton model, which can show the corresponding tree structure and the number of each joint freedom. Under this condition, the human body posture can be expressed as a translation and rotation vector. The body location is controlled by the root node balance and the body action is controlled by the rotation of each joint node. The 3d vector is used to express the translation. Euler angle, the rotation matrix and quaternion are used to 15

The Constraint-based Computer Editing Techniques of the Athlete Action Image