Study on a method to precisely reconstruct real environments using metrical techniques and seamlessly integrate a mixed real/virtual world.

在这项研究中，我们探索了一种新的方法来高精度地重建真实的室外和弹性物体的三维几何形状。虽然传统的方法不能处理这些对象，但我们已经开发了一种新的方法来克服这个问题。该方法集成了测量技术和基于激光扫描和视觉的三维测量技术。它灵活地允许以可变精度重建、可视化和变形对象以进行3D重建。我们进一步开发了一些应用系统来评估所开发方法的有效性。本文的研究成果如下：1.设计并实现了基于傅里叶变换的三维形状重建方法。它将从3D测距仪获取的点能数据转换为结构化的3D数据格式，从而在虚拟环境中精确重建和灵活变形被测物体。2.发明了重建物体的三维几何建模方法。它允许用户通过手绘草图界面和基于遗传算法的交互式形状探索策略，直观地对重建的三维对象进行变形。3.开发了三维建模应用系统。实现了陶瓷三维纹理创作、网页图标设计和三维索引与检索三个应用系统，对所设计的方法进行了验证。4.进行了网络化虚拟环境实验。我们已经实现了一个网络实验实验台，以评估和验证3D数据共享和远程协作的有效性。我们还实现了一个虚拟城市规划系统，以评估所开发的方法如何处理真实世界的对象，如建筑物和房屋。这些结果发表在IEEE/ACM会议论文和IPSJ/IEICE期刊论文上。

In this study, we have explored a new approach to reconstruct 3D geometric shapes of real outdoor and elastic objects with a high degree of accuracy. While traditional approaches cannot treat these objects, we have developed a new method to overcome the problem. The developed method integrate metrical techniques and 3D measurement technologies based on laser scanning and vision. It flexibly allows to reconstruct, visualize, and deform the objects with variable precision for 3D reconstruction. We further developed some application systems to evaluate effectiveness of the developed methods. This study has produced the following results :1.The 3D shape reconstruction method using Fourier transform is designed and implemented. It converts a point-could data acquired from a 3D range finder into a structured 3D data format to accurately reconstruct and flexibly deform the measured objects in a virtual environment.2.The 3D geometric modeling method of the reconstructed objects is invented. It allows users to intuitively deform the reconstructed 3D objects through a freehand sketch interface and an interactive genetic algorithm-based shape exploration strategy.3.The 3D modeling application systems are developed. Three application systems for 3D texture authoring, web icon design, and 3D indexing and retrieving of ceramics are implemented to evaluate the devised method.4.The experiments of the networked virtual environment are conducted. We have implement a network experiment test bed to assess and verify the effectiveness of the 3D data sharing and remote collaboration using the developed method. We have also implemented a virtual urban planning system to evaluate how the developed method can treat the real-world objects such as buildings and houses.These results are published in IEEE/ACM conference papers and IPSJ/IEICE journal papers.