Wu Fupei, Zhu Shukai, Ye Weilin
Department of Mechanical Engineering, Shantou University, Shantou 515063, China.
Key Laboratory of Intelligent Manufacturing Technology, Ministry of Education, Shantou University, Shantou 515063, China.
Sensors (Basel). 2020 Dec 9;20(24):7045. doi: 10.3390/s20247045.
Three-dimensional (3D) reconstruction and measurement are popular techniques in precision manufacturing processes. In this manuscript, a single image 3D reconstruction method is proposed based on a novel monocular vision system, which includes a three-level charge coupled device (3-CCD) camera and a ring structured multi-color light emitting diode (LED) illumination. Firstly, a procedure for the calibration of the illumination's parameters, including LEDs' mounted angles, distribution density and incident angles, is proposed. Secondly, the incident light information, the color distribution information and gray level information are extracted from the acquired image, and the 3D reconstruction model is built based on the camera imaging model. Thirdly, the surface height information of the detected object within the field of view is computed based on the built model. The proposed method aims at solving the uncertainty and the slow convergence issues arising in 3D surface topography reconstruction using current shape-from-shading (SFS) methods. Three-dimensional reconstruction experimental tests are carried out on convex, concave, angular surfaces and on a mobile subscriber identification module (SIM) card slot, showing relative errors less than 3.6%, respectively. Advantages of the proposed method include a reduced time for 3D surface reconstruction compared to other methods, demonstrating good suitability of the proposed method in reconstructing surface 3D morphology.
三维（3D）重建与测量是精密制造过程中常用的技术。在本论文中，基于一种新型单目视觉系统提出了一种单图像3D重建方法，该系统包括一个三级电荷耦合器件（3-CCD）相机和一个环形结构的多色发光二极管（LED）照明装置。首先，提出了一种照明参数校准程序，包括LED的安装角度、分布密度和入射角。其次，从采集的图像中提取入射光信息、颜色分布信息和灰度信息，并基于相机成像模型建立3D重建模型。第三，根据建立的模型计算视场内被检测物体的表面高度信息。所提出的方法旨在解决当前基于明暗恢复形状（SFS）方法在3D表面形貌重建中出现的不确定性和收敛速度慢的问题。对凸面、凹面、角面以及移动用户识别模块（SIM）卡槽进行了三维重建实验测试，相对误差分别小于3.6%。与其他方法相比，该方法的优点包括减少了三维表面重建的时间，表明该方法在重建表面三维形态方面具有良好的适用性。
