包含用于条纹图像的旋转滤波、四步相移法程序和多频外差算法程序，用于光栅投影法的三维重建-Contains filter fringe image rotation, four-step phase shift method procedures and multi-frequency heterodyne algorithm for three-dimensional reconstruction of the grating projection

用于生成多频外差法的图像，可以设定频率，默认采用三频，文件包含误差计算程序(For the image generated by multi frequency heterodyne method, the frequency can be set, and three frequency is used by default)