运用于使用光栅投影法进行三维测量环境，使用四步移相法提取相位（即相位解包裹），从畸变的光栅图像中提取出物体三维信息。(This method is applied to the three-dimensional measurement environment using grating projection method. Four-step phase-shifting method is used to extract the phase (phase unwrapping) and th