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Visualization of historical spot around Hakone Barrier station using efficient city modeling Efficient City Modeling
Figure 1 shows historical map used in this paper. The historical map is around the Hakone Barrier Station, and the circumference for each attribute data such as inns is drawn by black line in this map. The extraction method of the attribute data using mathematical morphology and remapping method were described by the authors (Yamada & Chikatsu 1999). However, extraction for small characters included dwelling area and insufficient clarity color were issues. Then, in order to acquire information for dwelling area such as position, area, height and width ratio, kind of dwelling area, firstly black lines in figure 1 are extracted using Gauss-Laplacian(GL) filter and extracted lines are corrected by manual. Figure 2 shows the corrected edge image. Secondly, position, area, height and width ratio for dwelling area are acquired by labeling procedure. 
Dwelling area for two kinds of inn can be recognize using figure 1 since dwelling areas were classified by two colors. Then, two basic 3D models for the typical inn are reconstructed previously using 3D CG, and recognition for each inn is performed using the position for the dwelling area and color information. The size of inn is transformed automatically using height and width ratio for dwelling area (Figure 3), and direction of each inn is also decided automatically so that the front of inn faces toward the road. Furthermore, inn faces toward the wider road when inn faces toward two roads. For example, inn (1) faces toward the east, and inn (2) faces toward the south shown in figure 4. Figure 5 shows the reconstructed city model by this procedure. 
Generally, barrier station was build at pivot point of traffic and had important role such as a present passport control. Barrier station was a special objects at an area, then it is needed to reconstruct by one by under historical investigation. Figure 6 shows 3D model for the Hakone Barrier station reconstructed by manually, figure 7 shows a scene around Hakone including Mt. Fuji and Ashino lake using digital data published by Geographical survey Institute. Furthermore, utilization of Internet and VR techniques to facilitate promotion of cultural heritage is one of the terms reference of ISPRS WG V/4 (Image analysis and spatial information systems for applications in cultural heritage). For this goal, the visual simulation are opened at following web site: http://www.chikatsu-lab.g.dendai.ac.jp/wgv4/, and figure 8 is one of scene of the visual simulation.   
Conclusion 3D Modeling method for recreating historical spot was described in this paper, and the remarkable points of this system are as follows:
Reference
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