手机屏显靶标用于标定小视场双目三维测量系统

Mobile Phone Screen Display Target Used in System Calibration of Small-Field Binocular 3D Measurement

双目结构光三维测量系统在使用之前,需要利用立体靶标或者平面靶标进行系统标定。为了获得良好的精度,通常选择定制高精度靶标,然而定制的标准靶标价格较高,且一旦定制完成,既定的特征参数使得可对应标定的双目系统也相对固定,此类靶标的使用灵活性受到限制。当三维测量系统测量视场较小时,为了降低标定的成本,同时希望标定靶的特征图案灵活可变,可适应多个测量系统的标定使用,利用智能手机屏显靶标对搭建的小视场双目三维测量系统进行标定,完成基于条纹投影的三维面形重建和测量。同时使用定制平面靶标对同一套测量系统进行标定,两个靶标的标定结果对比分析,验证了智能手机屏显靶标作为小视场双目三维测量系统标定靶的可行性。

Before the binocular structured light measurement system working,it is necessary to use a three-dimensional(3D) target or a planar target for system calibration. In order to obtain good result,customized high-precision and expensive targets are usually selected. However, once the chosen target is completely produced, the established characteristic parameters make the binocular system that can be calibrated is relatively fixed,so the flexibility of such target is limited. When the measuring field of a 3D measurement system is small,in order to reduce the cost of calibration,and hope the calibration target design can be flexible and adapted to the calibration of multiple measurement systems,a smartphone screen display target is used in the calibration of a small-field binocular 3D measurement system for final 3D shape reconstruction based on fringe projection. Meanwhile,a customized planar target is used to calibrate the same measurement system. The comparison and analysis of the results of two targets verifies the feasibility of the smart phone screen display target as a calibration target for a small-field binocular 3D measurement system.