Fourier transform profilometry (FTP) is widely used for real-time three-dimensional (3-D) surface shape measurement with a single frame of projection fringe pattern. The band-pass filter is very important to the shape retrieval accuracy of this technique. On the basis of the Hanning band-pass filter, a cross-shaped Hanning filter is developed in the paper to extract the first-order spectrum of deformed fringe pattern, and the effect of fringe angle on the proposed filter is analysed. The phase retrieval results using the proposed filter and Hanning filter are compared in the simulation and measurement experiment. The results show that the cross-shaped Hanning filter coordinating with the fringe pattern of about 45 degrees holds the higher accuracy of 3-D shape retrieval.

傅里叶变换轮廓测量法 (FTP) 广泛用于具有单帧投影条纹图案的实时三维 (3-D) 表面形状测量。带通滤波器对于该技术的形状检索精度非常重要。本文在汉宁带通滤波器的基础上，研制了一种十字形汉宁滤波器来提取变形条纹图案的一阶谱，并分析了条纹角对所提出滤波器的影响。在仿真和测量实验中比较了使用所提出的滤波器和汉宁滤波器的相位检索结果。结果表明，十字型汉宁滤波器与45度左右的条纹图案相协调，具有较高的3D形状检索精度。