基于波长分离的结构光采集系统

彩色结构光系统利用彩色投影机与摄像机中的三个颜色通道,同时投影和采集三幅条纹图像,拍摄一次即可实现形貌测量,但其无法测量彩色物体,通道间的串扰也降低了精度。提出了一种新的系统,利用三个摄像机采集三个通道,并利用严格设计的分色棱镜和滤光片,消除了彩色结构光系统中常见的波长通道间的颜色串扰。基于三步位移法,分析了拍摄两次图像获得彩色物体形貌的过程,并针对该系统提出了校正方法。利用上述方法,拍摄两次即可得到彩色的物体形貌。

Structured Light Acquisition System Based on Waveband Separation

Color-coded structural light system can reconstruct the 3D contour of the object in one shot by the using of three different patterns embedded into three color channels of the projector and camera. However, it cannot reconstruct a color object, and the crosstalks between different channels lower the accuracy. A novel color-coded structural light system is presented. By using multiple cameras and well designed beam splitter prism and filter, color crosstalk between different color channels in color-coded structural light system is eliminated. A process of two-shot acquiring color object prefile based on three-step phase measurement profilometry is analysed. Color calibration method is discussed to improve the system′s accuracy. After all the procedures, a colorful object can be reconstructed in two shots, which combines the speed and accuracy.