一种新的反向投影条纹生成方法研究

反向条纹投影技术是一种应用于在线或批量检测的快速而稳定的光学三维面形检测技术.提出了一种新的产生反向条纹的算法,新的算法建立投影器坐标系与摄像机坐标系的正向映射变换关系,通过投影器坐标系上一个像素点的两套相位值,找到其在摄像机坐标系中对应的位置,即产生投影器坐标系像素点在摄像机坐标系中的注册.由于期望在摄像机中观察到的条纹图像只是简单的正弦条纹图像,直接读取注册点的期望条纹相位,很容易产生反向条纹.计箅机模拟和反向条纹投影实验中的相位标准差分别达到7.044×10-6 rad和3.34×10-2rad,比以前的方法在精度上有了较大的提高,并简要分析了精度提高的原因.计算机模拟和实物测试实验都验证了该方法的可行性.

A New Method For Generation of Inverse Proj ected Fringe

Inverse fringe projection is a fast and robust optical 3D shape inspection techniqu,which is applied to online or batch inspection. A new method for generating inverse fringe is proposed,which builds the normal mapping transform relationship between projector coordinate and camera coordinate. A pixel on the projector coordinate has two suits of phase,through which its position on the camera coordinate can be located, which is called the register of projector pixels on the camera coordinate. Since the required fringe map in the camera is just simple sinusoid image, so it can easily get the inverse fringe by reading the phase of register point directly.Standard phase difference in simulation and real experiment reaches 7.044×10-6 and 3.34×10-2 separately,which gets a higher precision than former methods.Then the reason accounting for the high precision is analysed.Both simulation and experiment prove the feasibility of this method.