K. Povsic et al., "Laser Based Real-Time Measurement of Thorax 3D Deformation with Motion Compensation", in Proc. of 3rd Int. Conf. on 3D Body Scanning Technologies, Lugano, Switzerland, 2012, pp. 227-234, http://dx.doi.org/10.15221/12.227.
Laser Based Real-Time Measurement of Thorax 3D Deformation with Motion Compensation
Klemen POVSIC, Janez MOZINA, Matija JEZERSEK
University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia
We present a novel method for full-area, 3D visual breathing assistance with body motion compensation. The method is based on Kinect structured light triangulation sensor and uses local features detection algorithm to correct the undesired body motion during breathing training. The measuring system is contactless and operates in real-time with 30 frames per second. The feature detection algorithm is based on finding the best match between the reference template and the acquired texture image. This is performed by calculating the normalized cross-correlation inside the specified region of interest for four markers attached to the patient's thoraco-abdominal region. The motion compensation is achieved by 3D transformation of the acquired data with respect to the spatial coordinates of the detected markers. This enables the monitoring of respiratory-related displacements only, disregarding other displacements incurred by body motion.
The displacements of the current surface with respect to the reference surface are displayed using a color gradient, which offers visual support to the patients and helps to control respiratory motion according to the training requirements. The results of the study show that the 3D measuring system with motion compensation is robust and provides a reliable and unbiased method of breathing pattern assessment.
laser measurement, 3D, real-time, thorax, body motion, respiration
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