一种消零频的傅里叶变换轮廓术

Fourier Transform Profilometry Based on Zero Frequency Elimination

傅里叶变换轮廓术中零频成分的存在直接影响了测量范围和测量精度,为此提出一种新的消除零频实现快速三维形貌的测量方法。通过CCD相机采集一帧变形条纹图,然后对变形条纹图进行校正,使校正后的条纹不存在零频成分,再进行三维面形的恢复。与通过相移法消除零频、复合光栅投影测量技术相比,此方法有明显的速度优势,而且只需一帧变形条纹图即可测量,实时性好。理论分析和实验证明了提出方法的有效性。

The zero frequency component of Fourier transform profilometry directly affected the measurement range and accuracy;so a new frequency three-dimensional measurement method is proposed. CCD camera obtains a frame deformation fringe pattern, correcting the deformed fringe. There is no zero frequency component after the correction, then we recover the 3D shape. Compared with the way through the phase shift to eliminate zero frequency and the composite grating projection measurement, this method has obvious advantages, and only needs one frame of the deformed fringe to measure it in real-time. Theoretical analysis and experimental results demonstrate the effectiveness of the proposed method.