虚拟光栅三维形貌测量的小波数字低通滤波器

Wavelet Lowpass Filter for Software Phase-shift with Single Grating Image in 3D Measure-ment

采用一种基于小波数字滤波［１］的正交解调算法，用于三维形貌测试系统中的相位分布计算，文中考察了基于软件相移的相位计算［２］［３］，以及空域均值滤波和小波低通数字滤波的结果，得出由一副单帧变形光栅图可迅速、精确地重建物体的三维形貌，文中给出了计算机仿真和真实的螺旋浆叶片的实测结果。

A novel wavelet and FIR lowpass filter for 3D measurement is presented in this paper. We use a frame deformed grating phase image with soft- ware two - step phase - shift for phase demodulation instead of hardware three - step phase - shift. Com- puter imitation image and real blade measuring re- sults are given , using the digital techniques , we can reconstruct an object's 3D shape from a frame de- formed grating image .