基于相位追踪的水中物体三维面形测量

Three-Dimensional Measurement of Object in Water by Tracking Phase Value

提出一种基于相位追踪和光线追迹算法测量水中物体三维形貌的新方法。该方法利用正弦面结构光来记录物体的三维面形数据,首先由投影仪投出正弦条纹图来调制淹没于水中物体的三维信息,摄像机拍摄获得物体表面的变形条纹图,然后利用相位追踪算法确定投影条纹和变形条纹之间的对应点,最后对相应的匹配点对进行光线追迹计算后,可以恢复出物体的三维形貌。由于使用面结构光进行测量,无需移动装置来实现对物体的一维或二维全场扫描,这样既节约了经济成本又缩短了测量时间。利用该方法进行了实际测量,得到了较好的重建结果,证明了本方法的正确性和可行性.

A new method based on phase tracking algorithm and ray tracing algorithm is proposed for measuring the three-dimensional （3-D） shape of object in water. It uses digital sinusoidal fringe to record the information of objectcs 3-D shape. The phase tracking is taken to define the according points in the deformed pattern captured by the camera and the fringe pattern projected by the projector. Then the object＇s 3-D shape is calculated with ray tracing algorithm. This method uses 2-D patterned fringe to obtain the 3-D shape of object and the scanister is not needed, so the speed of reconstruction can be greatly increased and the cost of instruments will descend. An actual measurement is done, the perfect results of the reconstructed shapes prove its correctness and feasibility.