使用单彩色相机的单相机三维数字图像相关方法

Single-Camera Three-Dimensional Digital Image Correlation using a Single Color Camera

介绍了一种基于单个彩色相机的新型全靶面、单相机三维数字图像相关(3D-DIC)方法。借助于设计巧妙的颜色分光光路,被测物体表面图像可以通过两条不同的光路达到相机靶面,采集的标定靶和实验件表面的彩色图像可以分离得到蓝色和红色子图像。通过使用3D-DIC分析标定靶和实验件表面分离后的蓝色和红色子图像,可以获得物体表面的三维形貌和变形。形貌测量、面内和离面平移、以及静动态三维变形实验验证了该单彩色相机3D-DIC方法的有效性和测量精准度。由于可避免双相机同步,且能实现无分辨率损失的全靶面三维形貌和变形测量,本文方法在需要实现瞬态位移和变形测量的爆炸、冲击、振动等领域中具有广阔重要的应用前景。

This paper presents a novel full-frame,single-camera three-dimensional digital image correlation（3 D-DIC）using a single color camera.With the aid of a skillfully designed color separation optical path,the surface image of the test object can arrive at the camera sensor through two different optical paths.The recorded color images of the calibration target and test object are then separated into blue and red channel sub-images.By processing these sub-images using the regular stereo-DIC algorithm,full-field 3 D shape and deformation on the object surface can be retrieved. The effectiveness and accuracy of the proposed technique are demonstrated by the experiments of shape,in-plane and out-of-plane translation,and static and dynamic deformation measurement.Due to the avoidance of the complicated camera synchronization and the realization of full-field 3 Dshape and deformation measurement without the loss of its spatial resolution,the proposed technique demonstrates great potentials in the fields of explosive,impact and vibration,in which full-field transient displacement and deformation measurements are required.