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題 名 | 以二維CAD數值圖輔助數位影像中屋頂模型之重建=Roof Reconstruction from Digital Images and 2C CAD Information |
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作 者 | 吳碧玉; 王蜀嘉; | 書刊名 | 航測及遙測學刊 |
卷 期 | 4:1 1999.03[民88.03] |
頁 次 | 頁35-44 |
分類號 | 440.98 |
關鍵詞 | 數位立體影像; 數值地圖; 屋頂模型重建; Digital stereo images; Digital map; Roof-reconstruction; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究以臺南市郊大比例尺航空像片為實驗區,研究了於數位影像中以數值地圖 協助邊緣線匹配以重建屋頂幾何模型時應有的做法及問題。研究結果顯示,數值圖主要的協 助有兩方面:一是協助篩選可能的屋頂邊緣線,另一是在邊緣線破碎、缺漏時加以填補成一 完整的屋頂。由研究結果也可看出,即使有CAD資料的輔助,要正確重建屋頂的模型也不是 一件容易的事。最大的原因還是在低階邊緣萃取的結果不理想,常有破碎缺漏或受鄰近較強 訊號干擾的情形。但是總體而言,以CAD地圖輔助後的成功率是大幅提升了。 |
英文摘要 | Automatic building reconstruction by simple edge matching encounters many difficulties. The major one is that most of the edges extracted from an image by a low-level linear feature extraction method do not belong to any building edge at all. Moreover, an edge which appears to be straight in the image might actually not be straight in the object space at all, or it might even be from two totally different edges in the space. All these make simple edge matching ambiguous and very difficult to obtain a correct result. In this paper we used large-scale aerial images of a suburban area of Tainan for experiment and developing the methods of reconstructing roof models by edge matching with the help of digital map data. We found out that digital map data can be helpful in two ways. One is that the maps can be used to narrow down the search area for finding building edges. The other is that they can be used to fill up gaps in a broken image edge or even to complete a missing edge. The results of this research also show that even with the help of map data, it is still not easy to reconstruct roof models completely. The main reasons are (1) the low-level edge extraction is often faulty, (2) the roof edges extracted are usually interfered by adjacent strong signals or are broken, (3)some roof edges could not be extracted at all. But in general, with the help of digital maps, the successful rate of reconstruction of roofs by simple edge matching can be indeed increased effectively. |
本系統中英文摘要資訊取自各篇刊載內容。