Solar Wings' 3D Deformation Measurement of Videometrics System
Fengzhe Zhang, Jiexin Zhou, Guangcheng Dai, Yijie Bian, Xia Yang · 2016
In this paper, we proposed a novel videometrics system application based on binocular stereovision.And we successfully measured three-dimensional (3D) deformation of the solar wings plane.Videometrics has its inherent advantages in solving these problems, which can provide a non-contact, automatic, dynamic and high precision measurement.This system mainly includes camera calibration module, image feature point matching module and 3D model display module.Camera calibration is a key technology of stereoscopic calibration.We applied Zhang Zhengyou new approach, which is widely used to calibrate the camera.For the image matching part, we used the correlation matching method and Ackerman Least Squares method, which can achieve accuracy of 1/10 or even 1/100 pixel.To further optimize the process, epipolar constraint was adopted.Two-dimensional search can be converted into a one-dimensional search, thereby highly reducing the matching computation.Moreover, 3D space measured results obtained in the target point test can be displayed in the system.With the target region segmentation statistics, the correct result is more vividly displayed and accurately measured.Based on the proposed method we have designed the measurement software and simulate the solar wings's 3D deformation measurement experiment.The re-projection error for both of stereo cameras is no more than 0.2 pixel.The height difference of solar wings plane is 0.014mm.The method proposed in this paper has significance both on the theory and application.