Dimensional coordinate measurements: application in characterizing cervical spine motion

Weilong Zheng; Linan Li; Shibin Wang; Zhiyong Wang; Nianke Shi; Yuan Xue

doi:10.1117/12.2054299

2 June 2014 Dimensional coordinate measurements: application in characterizing cervical spine motion

Weilong Zheng, Linan Li, Shibin Wang, Zhiyong Wang, Nianke Shi, Yuan Xue

Proceedings Volume 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics; 92340N (2014) https://doi.org/10.1117/12.2054299
Event: International Conference on Experimental Mechanics 2013 and the Twelfth Asian Conference on Experimental Mechanics, 2013, Bangkok, Thailand

Abstract

Cervical spine as a complicated part in the human body, the form of its movement is diverse. The movements of the segments of vertebrae are three-dimensional, and it is reflected in the changes of the angle between two joint and the displacement in different directions. Under normal conditions, cervical can flex, extend, lateral flex and rotate. For there is no relative motion between measuring marks fixed on one segment of cervical vertebra, the cervical vertebrae with three marked points can be seen as a body. Body’s motion in space can be decomposed into translational movement and rotational movement around a base point .This study concerns the calculation of dimensional coordinate of the marked points pasted to the human body’s cervical spine by an optical method. Afterward, these measures will allow the calculation of motion parameters for every spine segment. For this study, we choose a three-dimensional measurement method based on binocular stereo vision. The object with marked points is placed in front of the CCD camera. Through each shot, we will get there two parallax images taken from different cameras. According to the principle of binocular vision we can be realized three-dimensional measurements. Cameras are erected parallelly. This paper describes the layout of experimental system and a mathematical model to get the coordinates.

Citation Download Citation

Weilong Zheng, Linan Li, Shibin Wang, Zhiyong Wang, Nianke Shi, and Yuan Xue "Dimensional coordinate measurements: application in characterizing cervical spine motion", Proc. SPIE 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics, 92340N (2 June 2014); https://doi.org/10.1117/12.2054299

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KEYWORDS

Cameras

Spine

Motion measurement

3D modeling

Calibration

Visual process modeling

Motion models

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