System Calibration for Panoramic 3D Measurement with Plane Mirrors

In this paper, we propose a system calibration method for panoramic 3D shape measurement with plane mirrors. By introducing plane mirrors into the traditional fringe projection profilometry (FPP), our system can capture fringe images of the measured object from three different perspectives simultaneously including a real camera and two virtual cameras obtained by plane mirrors, realizing panoramic 3D shape reconstruction only by single-shot measurement. Furthermore, a flexible new technique is proposed to easily calibrate the mirror. In the proposed technique, the calibration of the mirror is discussed mathematically to ensure the effectiveness and rationality of the calibration process, it only requires the camera to observe a set of feature point pairs (including real points and virtual points) to achieve the solution of the reflection matrix for plane mirrors. The acquired calibration information is used to convert 3D point cloud data obtained from real and virtual perspectives into a common world coordinate system, making it possible to obtain full-surface 3D data of the object. Finally, benefited from the robust and high-performance calibration method, experimental results verify that our system can achieve high-accuracy and panoramic 3D shape measurement.