Institute of Micromechanics and Photonics, Faculty of Mechatronics, Warsaw University of Technology, ul. Św. Andrzeja Boboli 8, 02-525 Warsaw, Poland.
Sensors (Basel). 2018 Aug 27;18(9):2827. doi: 10.3390/s18092827.
The existing methods for measuring the shape of the human body in motion are limited in their practical application owing to immaturity, complexity, and/or high price. Therefore, we propose a method based on structured light supported by multispectral separation to achieve multidirectional and parallel acquisition. Single-frame fringe projection is employed in this method for detailed geometry reconstruction. An extended phase unwrapping method adapted for measurement of the human body is also proposed. This method utilizes local fringe parameter information to identify the optimal unwrapping path for reconstruction. Subsequently, we present a prototype 4DBODY system with a working volume of 2.0 × 1.5 × 1.5 m³, a measurement uncertainty less than 0.5 mm and an average spatial resolution of 1.0 mm for three-dimensional (3D) points. The system consists of eight directional 3D scanners functioning synchronously with an acquisition frequency of 120 Hz. The efficacy of the proposed system is demonstrated by presenting the measurement results obtained for known geometrical objects moving at various speeds as well actual human movements.
现有的人体运动形态测量方法由于不成熟、复杂和/或价格高昂，在实际应用中受到限制。因此，我们提出了一种基于多光谱分离支持的结构光的方法，以实现多方向和并行采集。该方法采用单帧条纹投影进行详细的几何结构重建。还提出了一种适用于人体测量的扩展相位解缠方法。该方法利用局部条纹参数信息来识别用于重建的最佳解缠路径。随后，我们展示了一个原型 4DBODY 系统，其工作体积为 2.0×1.5×1.5m³，测量不确定度小于 0.5mm，三维（3D）点的平均空间分辨率为 1.0mm。该系统由八个方向的 3D 扫描仪组成，以 120Hz 的采集频率同步工作。通过展示以不同速度移动的已知几何物体以及实际人体运动的测量结果，验证了该系统的有效性。
