Sansoni G, Corini S, Lazzari S, Rodella R, Docchio F
Appl Opt. 1997 Jul 1;36(19):4463-72. doi: 10.1364/ao.36.004463.
A three-dimensional (3-D) imaging system based on Gray-code projection is described; it is thought to be used as an integration to the already developed profilometer based on the projection of multifrequency gratings. The Gray-code method allows us to evaluate the 3-D profile of objects that present even marked discontinuities of the surface, thus increasing the flexibility of the measuring system as to the topology of the objects that can be measured. The basic aspects of Gray-code projection for 3-D imaging and profiling are discussed, with particular emphasis devoted to the study of the resolution of the method and to the analysis of the systematic errors. The results of this study allow us to determine the optimal setting of the parameters of the measurement and to develop a suitable calibration procedure. The procedures for implementing the Gray-code method are presented, and some interesting experimental results are reported. Calibration of the system reveals an accuracy of 0.2 mm, corresponding to 0.1% of the field of view.
本文描述了一种基于格雷码投影的三维（3-D）成像系统；该系统被认为可作为已开发的基于多频光栅投影的轮廓仪的集成设备。格雷码方法使我们能够评估表面存在明显不连续的物体的三维轮廓，从而提高了测量系统对于可测量物体拓扑结构的灵活性。本文讨论了用于三维成像和轮廓测量的格雷码投影的基本方面，特别着重于该方法分辨率的研究以及系统误差的分析。这项研究的结果使我们能够确定测量参数的最佳设置，并开发出合适的校准程序。文中介绍了实施格雷码方法的步骤，并报告了一些有趣的实验结果。系统校准显示精度为0.2毫米，相当于视场的0.1%。
