操船シミュレータ上の灯火の表現手法とその評価

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When ships go through the Kanmon Passage in Japan at night, it is very difficult for navigators to recognize several buoys of the passage, because they are confused with illumination of plants and city lights. There is a plan that the layout of the Kanmon Passage will be changed to improve recognition of those buoys. We tried to confirm effectiveness of those light aids to navigation such as buoys and lighthouses, after the passage change. To evaluate the light aids, we have simulated buoys, light-houses, guiding lights and illuminations of background of the Kanmon Passage in our ship handling simulator. Brightness of lights is scattered with very wide range in the real world. On the other hand, CGI (Computer Graphics Imagery) can not represent enough range of lighting directly. This is why we investigated appropriate color palettes that are brightness and polygon sizes of buoys and lighthouses from luminance on simulator screens. To represent the luminance of buoys and lighthouses not absolutely but relatively, we have combined those color palettes and sizes with method of Level-of-Detail. Every polygon size is decided to cover at least one pixel on the screen to avoid disappearance of the light aids, especially at a long distance. According to Level-of-Detail, the polygon size is gradually decreasing. An appropriate color palette that is brightness is chosen to keep the luminance of the light aids between each Level-of-Detail. Using those techniques, we can evaluate effectiveness of new layout and light aids in the Kanmon Passage.
社団法人日本航海学会の論文
1996-09-25

操船シミュレータ上の灯火の表現手法とその評価

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