基于深度图像的关节活动度测量及其结果评价  

Measuring joint range of motion and evaluating measured results based on depth images

作　　者：王伟伟[1] 郭远其 高卉[1] 李浩[1] 郑棠芬 林林[1] 张怀岺[1] 

机构地区：[1]广东医学院信息工程学院,广东东莞523808

出　　处：《中国医学物理学杂志》2016年第3期262-269,共8页Chinese Journal of Medical Physics

基　　金：东莞市科技计划项目(2012108102001)

摘　　要：目的：使用微软的体感捕捉设备磁nect实现了一种新的关节角度测量方式。方法：设计了KJnect的数据波动性及精度评价实验方案，在可视范围内对测量误差的空间分布进行检测，并获得测量的最佳位置信息。设计人体关节角度测量对比实验，并在此基础上通过多项式拟合及函数变换获得修正函数。结果：实验最终测得X轴坐标范围为0．0077～O．4054m、Z轴坐标范围为2．1757-2．5803m的区域是Kinect的最佳测量位置（Kinect自身坐标系）。关节点测量数据波动性在x、Y、z轴方向上分别为0．008、0．009和0．015m。以右肘关节和左肩关节为例，最终测得关节角度平均偏差分别为3．03°、2．90°。结论：新型Kinect关节角度测量方式与传统测量方式相比，测量结果无明显差异。测量方法能够有效排除主观干扰并满足实时测量要求。Objective The somatosensory capture device Kinect of Microsoft is used to achieve a new measuring pattern for joint angles in the paper. Methods An experimental scheme for the evaluation of Kinect data volatility and accuracy was designed to detect the spatial distribution of measured error in the visual scope, obtaining the information of best measuring position. Meanwhile, a contrasting test for measuring the range of motion was designed. Based on the previous work, the modified function was obtained by polynomial fitting and transformation of function. Results The experiment showed the best measuring position was limited in the scope of X coordinate ranging of from 0.007 7 m to 0.405 4 m and Z coordinate ranging from 2.175 7 m to 2.580 3 m in Kinect＇s own coordinate system. The volatility of the measuring coordinate data was within 0.008 m, 0.009 m and 0.015 m in X, Y, Z coordinate directions, respectively. Taking the right elbow and left shoulder as the example, the final average deviations of measured joint angles were respectively 3.03° and 2.9°. Conclusion No obvious differences were found between the new Kinect measurement for joint angles and the traditional one. And the Kinect measurement can effectively eliminate subjective interferes and achieve the real-time measurement.

关 键 词：深度图像 骨骼跟踪 多项式拟合 三维测量 关节活动度 

分 类 号：R318.6[医药卫生—生物医学工程]