Cao Pu, Xi Jiangtao, Yu Yanguang, Guo Qinghua, Song Limei
Opt Express. 2014 Nov 17;22(23):29234-48. doi: 10.1364/OE.22.029234.
In this paper, a temporal shift unwrapping technique is presented for solving the problem of shift wrapping associated with spatial shift estimation (SSE)-based fringe pattern profilometry (FPP). Based on this technique, a novel 3D shape measurement method is proposed, where triangular patterns of two different spatial frequencies are projected. The patterns of the higher frequency are used to implement the FPP, and the one with lower frequency is utilized to achieve shift unwrapping. The proposed method is able to solve the shift unwrapping problem associated with the existing multi-step triangular pattern FPP by projection of an additional fringe pattern. The effectiveness of the proposed method is verified by experimental results, where the same accuracy as existing multi-step triangular pattern FPP can be achieved, but enabling the measurement of objects with complex surface shape and high steps.
本文提出了一种时间移位展开技术，用于解决基于空间移位估计（SSE）的条纹图案轮廓术（FPP）中与移位包裹相关的问题。基于该技术，提出了一种新颖的三维形状测量方法，其中投影两种不同空间频率的三角形图案。高频图案用于实现条纹图案轮廓术，低频图案用于实现移位展开。所提出的方法能够通过投影额外的条纹图案来解决与现有多步三角形图案条纹图案轮廓术相关的移位展开问题。实验结果验证了所提方法的有效性，该方法能够达到与现有多步三角形图案条纹图案轮廓术相同的精度，同时能够测量具有复杂表面形状和高台阶的物体。
