激光与光电子学进展, 2020, 57 (1): 011202, 网络出版: 2020-01-03   

光栅投影三维测量系统中标定技术的研究 下载: 1248次

Calibration of Fringe Projection Three-Dimensional Measurement System
作者单位
浙江大学机械工程学院, 浙江 杭州 310027
摘要
相机和投影仪的标定精度决定光栅投影三维系统的测量精度。提出一种改进的标定方法。该方法在逆向相机模型的基础上对投影仪进行标定,利用相位编码法进行绝对相位展开,避免相机标定误差的引入,在标定过程中减少投影仪投射图案的数量,使标定操作更加简单、快速。在系统的标定过程中,利用投影仪投射的垂直、水平两组光栅图像,建立其与相机图像的对应关系,进而求得标志点圆心在投影仪图像上的像素坐标;然后利用带有径向畸变的相机模型对投影仪进行标定;最后进行系统的立体标定,确定相机和投影仪间的相对位置关系。实验结果表明所提方法切实可行。
Abstract
The measurement accuracy of the fringe projection three-dimensional system is mainly determined by the calibration accuracy of a camera and a projector. This study proposes an improved calibration method. Further, the projector is calibrated based on the inverse camera model. The phase coding method is employed to obtain the unwrapped phase, avoids the introduction of the camera calibration error, reduces the number of images projected by the projector, and simplifies and accelerates the calibration operation. Using two sets of fringe patterns, both horizontal and vertical, the projection by the projector corresponds with the camera image in case of system calibration. Thus, the pixel coordinate of the circular mark points in a projector image can be obtained. Subsequently, a radial distortion camera model is utilized for calibrating the projector. In addition, stereo calibration is the final step used to obtain a geometric relation between the camera and the projector. Furthermore, the experimental results demonstrate that the proposed calibration method is feasible.

徐念, 武建伟, 魏小保. 光栅投影三维测量系统中标定技术的研究[J]. 激光与光电子学进展, 2020, 57(1): 011202. Nian Xu, Jianwei Wu, Xiaobao Wei. Calibration of Fringe Projection Three-Dimensional Measurement System[J]. Laser & Optoelectronics Progress, 2020, 57(1): 011202.

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