由于数字投影和采集系统的非线性失真,传统的方法通常需对采集到的条纹进行低通或带通滤波从而抑制高次谐波并获取基频分量。基于广义分析模型针对数字条纹轮廓术提出一种对测量后的物体形貌进行后滤波的算法,消除了非线性失真对测量结果所造成的影响并提高了数字条纹轮廓术的测量精度。论述了条纹轮廓术的原理和广义分析模型,分析推导出后滤波算法。仿真和实验结果表明,后滤波方法能够快速准确地实现基于数字投影的三维形貌重建。

Due to the nonlinearity of the digital projection and acquisition system, usually it is necessary for traditional approaches to eliminate high-order harmonics of the captured fringe patterns by using lowpass or bandpass filters and obtain fundamental component. A novel filtering method-post filtering for digital fringe pattern profilometry is presented based on generalized analysis model, it can reduce the influence from the nonlinear distortion of the fringe patterns and improve the accuracy of digital fringe pattern profilometry. The principle of fringe pattern profilometry and generalized analysis model are recited,a derivative process of the post filtering method is analyzed. Simulation and experimental results show that fast and precise digital three-dimensional reconstruction can be achieved by the post filtering method.