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图学学报 ›› 2023, Vol. 44 ›› Issue (3): 540-550.DOI: 10.11996/JG.j.2095-302X.2023030540

• 图像处理与计算机视觉 • 上一篇    下一篇

基于SfM的城市电缆隧道三维重建方法优化研究

葛海明1(), 张维2,3(), 王小龙1, 朱晶晶1, 贾非2,3, 薛亚东2,3   

  1. 1.中国能源建设集团江苏省电力设计院有限公司,江苏 南京 211102
    2.同济大学土木工程学院地下建筑与工程系,上海 200092
    3.同济大学岩土及地下工程教育部重点实验室,上海 200092
  • 收稿日期:2022-09-28 接受日期:2023-02-22 出版日期:2023-06-30 发布日期:2023-06-30
  • 通讯作者: 张维(1998-),男,硕士。主要研究方向为三维重建、计算机视觉、隧道性能评估与预测等。E-mail:1653507333@qq.com
  • 作者简介:

    葛海明(1976-),男,正高级工程师,本科。主要研究方向为隧道工程数字图像处理与识别。E-mail:gehaiming@jspdi.com.cn

  • 基金资助:
    中国电力工程顾问集团有限公司科研项目(GSKJ2-G03-2021)

Optimization of 3D reconstruction method for urban cable tunnel based on SfM method

GE Hai-ming1(), ZHANG Wei2,3(), WANG Xiao-long1, ZHU Jing-jing1, JIA Fei2,3, XUE Ya-dong2,3   

  1. 1. China Energy Engineering Group Jiangsu Power Design Institute Co., Ltd, Nanjing Jiangsu 211102, China
    2. Department of Geotechnical Engineering College of Civil Engineering, Tongji University, Shanghai 200092, China
    3. Key Laboratory of Geotechnical and Underground Engineering (Tongji University), Ministry of Education, Shanghai 200092, China
  • Received:2022-09-28 Accepted:2023-02-22 Online:2023-06-30 Published:2023-06-30
  • Contact: ZHANG Wei (1998-), master. His main research interests cover 3D reconstruction, computer vision, tunnel performance evaluation and prediction, etc. E-mail:1653507333@qq.com
  • About author:

    GE Hai-ming (1976-), undergraduate. His main research interests cover digital image processing and recognition for tunnel engineering. E-mail:gehaiming@jspdi.com.cn

  • Supported by:
    Research Projects of China Power Engineering Consulting Group Co., Ltd(GSKJ2-G03-2021)

摘要:

三维重建技术常被应用于城市地铁隧道、铁路隧道等场景,用来进行隧道形态的可视化展观以及隧道性态的分析。对于城市电缆隧道,由于其内部障碍物较多,断面较小等特点,采用三维激光扫描仪等传统的三维重建方式存在一定的困难。摄影测量由于其设备的便携性,应用于电缆隧道的三维重建具有优势。基于摄影测量理论,对影响电缆隧道三维重建效果的各种因素进行总结和分析并建立了针对电缆隧道场景三维重建的模型评价方法。于南通滨江路GIL电缆隧道内开展现场实验,对于原始图像存在的明暗不均问题,选用直方图均衡化+伽马变换进行增强化预处理,恢复隧道图像暗部的衬砌细节。基于运动恢复结构(SfM)三维重建方法,构建了具有完整内部纹理信息的电缆隧道三维模型。同时以模型评价方法为判断标准,对图像采集方法和建模参数等关键因素进行优化研究。结果表明,使用200张图像、中等质量建模能够保证较高的点云密度(1.0×105 m)、合理的中心特征点数量(321个)、较低的均方根重投影误差(1.36 pix),同时又兼顾了较高的建模效率(177 s),满足隧道三维重建的需要。

关键词: 电缆隧道, 摄影测量, 三维重建, 运动恢复结构, 伽马变换, 直方图均衡化

Abstract:

The three-dimensional reconstruction technology is extensively applied to various scenarios such as urban subway tunnels and railway tunnels to visualize tunnel structure and analyze tunnel properties. For urban cable tunnels, due to many internal obstacles with smaller sections than subway tunnels, there are some difficulties in using the traditional three-dimensional reconstruction methods such as 3D laser scanners. Photogrammetry technology, with its portable equipment, holds significant potential in the three-dimensional reconstruction of cable tunnels. Based on photogrammetry theory, this paper summarized and analyzed various factors affecting the effect of 3D reconstruction of cable tunnels and established a model evaluation method for 3D reconstruction of cable tunnel scenes. Experiments were carried out in a gas insulated transmission line (GIL) cable tunnel in Nantong, Jiangsu Province. To mitigate the problem of uneven brightness and darkness in the original image, histogram equalization and gamma transform were employed for enhanced preprocessing, thereby restoring the lining details of the dark part of the tunnel image. Based on the structure from motion (SfM) 3D reconstruction method, a 3D model of the cable tunnel with complete internal texture information was successfully constructed. Taking the model evaluation method as the judgment standard, the key factors such as image acquisition method and modeling parameters were optimized. The results revealed that employing 200 images and moderate quality modeling can ensure high point cloud density (1.0×105 m), a reasonable number of central feature points (321), a low RMS reprojection error (1.36 pix), and a high modeling efficiency (177 s), meeting the needs of tunnel inspection.

Key words: cable tunnels, photogrammetry, three-dimensional reconstruction, structure from motion, gamma transform, histogram equalization

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