Design of joint angle digital measuring and functional assessing system

• Main Authors: Fang Yanhong, Yang Xuemei, Zhang Hongying, Wang Xueyuan
• Format: Article
• Language: zho
• Published: National Computer System Engineering Research Institute of China 2018-08-01
• Series: Dianzi Jishu Yingyong
• Subjects: Kinect data acquisition; joint angle measurement; function assessment; K-means clustering algorithm
• Online Access: http://www.chinaaet.com/article/3000089150

In order to realize digital measurement and objective function assessment for joint angle, an joint angle digital measuring and functional assessing system is established and its applied algorithms is investigated. Firstly, based on Kinect data acquisition principles and calculation method of space vectors, the joint angle measuring algorithm is presented. The space points of joint on the basis of the depth data of Kinect are converted to the corresponding three-dimensional coordinates which will be used to calculate the Euclidean distance between each key point, and the joint space angles are calculated according to the angle formula of space vector. Then after the performance of several clustering methods is compared, the algorithm of function assessing by K-means is analyzed. Experimental results indicate that the system can realize the digital measuring and assessing, and the precision of the clustering indexes of purity，RI and F-meaures can be stabled in 0.8 and above. It can satisfy the system requirements of non-contact, objective, effective, higher precision and strong adaptability, as well as user-friendly control and low cost.