| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 93 === Three dimensional geo-information is a fast developing topic in remote sensing and Geographic Information Systems. Using the technology of remote sensing, 3D building models could be constructed to resemble real buildings. However, currently, most building models do not have sufficient texture characteristics. The lack of texture not only makes 3D building models less realistic, it also fails to provide needed information, especially for complex applications such as cyber city implementation.
The purpose of this study was to produce accurate texture mapping on building models. The textures were generated from mosaic of digital pictures taken from different angles and distances. Because of different picture-taking conditions, individual pictures might have different brightness, shadings, and other properties. All of them needed to be addressed before the mosaiced pictures can be mapped onto building models. This study developed a procedure to integrate digital pictures and correctly mapped them to corresponding objects in building models. The procedure first excluded shadows in the pictures. Then, overlapped regions were identified using tie points to develop mathematical relationship of the target objects across pictures. The developed mathematical models were then used to merge the pictures to generate a smooth and seamless image of the target object. Finally, the mosaic images were mapped to correct building facets (walls) using linear transformation and parametric transformation. The resultant building models should have a more accurate texture and improve the reality and practicality of cyber city implementation.
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