Institute of Solid Mechanics, School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China.
Beijing Advanced Discipline Center of Unmanned Aircraft System, Beihang University, Beijing 100191, China.
Sensors (Basel). 2019 Oct 31;19(21):4726. doi: 10.3390/s19214726.
A simple and practical full-frame single-camera stereo-digital image correlation (stereo-DIC) technique for three-dimensional (3D) shape, displacement, and deformation measurements is proposed. The technique uses a compact X-cube prism-based color separation device and a color camera to capture images of blue and red colors from different optical paths, and then extracts the surface 3D shape and deformation information of a test sample by processing the captured two sub-channel color images using regular stereo-DIC algorithm. Compared with the existing full-frame single-camera stereo-DICs, the proposed one eliminates the need for a beam splitter and two bandpass filters to capture images, and offers more simple, compact, and easy-to-use optical arrangement. This novel single-camera stereo-DIC technique was validated by a series of baseline experiments involving 3D surface reconstructions, translation tests, and full-field deformation measurements, which provide a new flexible and practical avenue for measuring surface 3D shape and deformation, particularly in microscopic and high-speed applications.
提出了一种简单实用的全帧单相机立体数字图像相关（立体 DIC）技术，用于三维（3D）形状、位移和变形测量。该技术使用紧凑的基于 X 立方体棱镜的颜色分离装置和彩色相机从不同光路捕获蓝色和红色颜色的图像，然后通过处理捕获的两个子通道彩色图像使用常规立体 DIC 算法提取测试样品的表面 3D 形状和变形信息。与现有的全帧单相机立体 DIC 相比，所提出的方法无需使用分束器和两个带通滤波器来捕获图像，并且提供了更简单、更紧凑和更易于使用的光学布置。通过一系列涉及 3D 表面重建、平移测试和全场变形测量的基线实验验证了这种新颖的单相机立体 DIC 技术，为测量表面 3D 形状和变形提供了一种新的灵活实用的方法，特别是在微观和高速应用中。
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