一种基于双线激光的三维测量方法

A 3D Measuring Method Based on Dual-beam Structured-lasers

三维扫描系统在扫描过程中经常会遇到被测物体遮挡了CCD的可视区域导致扫描数据的丢失问题,从而使重构模型产生缺陷。针对该问题,本文提出一种改进措施通过在以CCD为中心的对称位置增加一路激光器,使得系统可以获取两幅不同角度的点云图,然后将这两幅点云图进行拼接互补了单幅点云图的缺陷。最后,分别对被测物体的上、中、下3个部位的距离及其对应的三维模型的距离进行多组数据的测量,并计算出其均方误差为0.22～0.403mm。

The 3D scanning system often encounters defects of reconstruction models during the scanning process, which is caused by the loss of scanning data due to the blocking of CCD＇ s viewing area by the object being measured. Aiming at this prob- lem, this paper proposes an improved method, in which a laser is added at the CCD-centered symmetrical position to make the system enable to obtain two point clouds at two different angles. Then the two point clouds are stitched together to eliminate the defects of one single point cloud. Finally, distances of the upper, middle and lower parts of the object are measured respectively, as well as the distances of their 3D models. Meanwhile the mean squared error is calculated.