Paper Info
Title
Measurement of body joint angles for physical therapy based on mean shift tracking using two low cost Kinect images
Abstract
Range of motion (ROM) is commonly used to assess a patient's joint function in physical therapy. Because motion capture systems are generally very expensive, physical therapists mostly use simple rulers to measure patients' joint angles in clinical diagnosis, which will suffer from low accuracy, low reliability, and subjective. In this study we used color and depth image feature from two sets of low-cost Microsoft Kinect to reconstruct 3D joint positions, and then calculate moveable joint angles to assess the ROM. A Gaussian background model is first used to segment the human body from the depth images. The 3D coordinates of the joints are reconstructed from both color and depth images. To track the location of joints throughout the sequence more precisely, we adopt the mean shift algorithm to find out the center of voxels upon the joints. The two sets of Kinect are placed three meters away from each other and facing to the subject. The joint moveable angles and the motion data are calculated from the position of joints frame by frame. To verify the results of our system, we take the results from a motion capture system called VICON as golden standard. Our 150 test results showed that the deviation of joint moveable angles between those obtained by VICON and our system is about 4 to 8 degree in six different upper limb exercises, which are acceptable in clinical environment.
Year
DOI
Venue
2015
10.1109/EMBC.2015.7318459
Engineering in Medicine and Biology Society
Field
DocType
Volume
Voxel,Computer vision,Motion capture,Upper limb exercises,Range of motion,Computer science,Physical therapy,Gaussian,Artificial intelligence,Clinical diagnosis,Mean-shift,3d coordinates
Conference
2015
ISSN
Citations 
PageRank 
1557-170X
0
0.34
References 
Authors
3
3
Name
Order
Citations
PageRank
Cheng-Yu Chen16810.76
Jin-Hyoung Lee201.01
Lin, K.H.300.34