相位偏折测量系统的标定是影响其测量精度的重要因素。针对立体相位偏折测量系统中显示屏和相机位姿关系标定困难的问题,研究了一种新的系统标定方法。通过在显示屏上构造特征点,引入摄影测量系统作为显示屏坐标系与相机坐标系的转换中介,实现了显示屏坐标系与相机坐标系转换关系的高精度标定。搭建立体偏折系统进行标定精度验证,得到的重建表面平面度结果小于1 μm,这证明了本标定方法的可行性和有效性。

The calibration of the phase measuring deflectometry (PMD) system is an important factor affecting the accuracy. Aiming at the difficulty of the calibration of posture relationship between the screen and camera in PMD system, a new system calibration method is proposed. By constructing retro-reflectors on the screen, a photogrammetry system is introduced as the medium of transformation between the screen coordinate system and the camera coordinate system. Therefore, a high precision calibration of geometric parameters is achieved. The calibration accuracy is verified using a stereo PMD system. The experimental results show that the reconstruction surface flatness is less than 1 μm, which demonstrates that the proposed method is feasible and effective.