Many large-scale plants are currently being planned or constructed worldwide. Clients require contractors to minimize construction costs and work periods. We are striving to streamline construction work and thus reduce construction costs by focusing on simplifying installation work, shortening installation periods, standardizing all on-site work, and improving quality and safety. When pipes are installed at large-scale plant construction sites, pipes for adjustment called final spools are sometimes inserted between facilities that have been installed and piping that has been fastened. They are delivered to sites in a state that allows for on-site processing. After delivery, on-site matching and adjustment of the amount of processing based on the result of the on-site matching are repeated, and then the final spools are fitted into the spaces between facilities and piping. We have researched and developed a virtual fitting system to streamline fitting work. This paper describes the details of this system and the results of its application.
The number of large plants (energy, industry, etc.) being planned and constructed in the world has increased
tremendously in recent times. By reducing the construction costs involved in the development of these plants, authors
can reduce the initial investment required, thereby ensuring a more economical use of monetary resources. However,
construction work still requires considerable skill and labor. Hence, it is necessary to develop new systems and processes
for construction cost reduction. In this investigation, efficient automatic measurement method for embedded plate fixed
position was examined by linking digital photogrammetry and CAD data. The developed measurement system was
applied to large plant construction field, and the verification about efficiency was performed. In this paper, these contents
will be reported.
Recently, a laser scanner has been receiving more attention as a useful tool for real-time 3D data acquisition, and various applications such as city modeling, DTM generation and 3D modeling of cultural heritage were proposed. However, robust filtering for distinguish on- and off-terrain points from point cloud 3D data collected by airborne laser scanner is still issues. In particular, filtering of point cloud 3D data collected by terrestrial laser scanner has more severe problems caused by many occlusion parts, windows, few the deepest points, wall of buildings and so on.
In order to perform 3D texture modeling of cultural heritage using terrestrial laser ranging data, texture modeling method are investigated in this paper, and proposed filtering method is based on flatness within 30*30cm. Flatness area (ground surface, wall of structures, etc.) and non-flatness area (trees, bushes, etc.) is classified using measurement result of many target., and non-flatness areas are interpolated using morphological procedure.
The filtering method shows very robust result, and the most remarkable point of this filtering method is its ability to obtain break-lines which give important information for 3D modeling since 3D model of historical structure are consists of flatness areas (e.g. roof, wall, pillar). Therefore, surface patch of 3D model is identified by extracting a flatness area which is surrounded by break-line, and 3D model for the patch is generated using point cloud 3D data along the frame of the patch.
Furthermore, curve points for surface patch are detected from break-line, and a surface patch is generated in automatically step-by-step, texture modeling will be done with the surface patch and digital image.
Therefore, automatic detection of the curve point, which is necessary for model making, is very difficult. Because, break-line includes a lot of small curve points.
In this paper, we particularly watched this problem and carried out promotion of efficiency of model making by developing a solution method.
With these processes, efficient 3D representation using textured model is performed without any processes.
This paper presents 3D textured modeling method for historical structure using terrestrial laser ranging data and break-line by flatness evaluation, detection method of curve point using break-line.
In the compilation of archival records for archeological artifacts, true ortho-graphic drawings of these artifacts have to be drawn by the archaeologists themselves or part- timers, taking a great deal of time, labor and skill. For saving the labor, the authors have developed ortho projection system using CCD camera. 3D measurement system using ortho projection system are described in this paper. Finally, it demonstrates wireframe model for jomon-pottery by using this system.
The effectiveness of the real-time ortho projection and drawing system using a CCD camera and line lasers developed by the authors has been indicated. However, 3D visualization for archeological artifacts, such as wireframe model, surface model or texture model should be added to this system. There are some methods for performing a digital 3D modeling such as the range finder method. The most remarkable point of this system is its ability to get a real-time ortho projection image and a 3D model with one CCD camera.
In the compilation of archival records for archeological artifacts, true orthographic drawings of these artifacts have to be drawn by the archeologists themselves or part-timer, expending a great deal of time, labor, and skills. This paper describes the real time orthographic drawing system using a CCD camera. Finally, it demonstrates real time orthographic drawing results for Jomon pottery by using this system instead of the manual method which requires 3-4 hours.