頁籤選單縮合
題 名 | 應用方向約制Hough轉換法於空照影像建物圖徵抽取=On the Building Feature Extraction from Aerial Image with Orientation Constrained Hough Transformation |
---|---|
作 者 | 張崑宗; 何維信; 史天元; | 書刊名 | 航測及遙測學刊 |
卷 期 | 2:2 1997.06[民86.06] |
頁 次 | 頁15-35 |
分類號 | 440.981 |
關鍵詞 | 幾何判識要件; 方向約制Hough轉換; 地物特徵; Geometric primitives; Orientation constrained hough transform; Man-made features; |
語 文 | 中文(Chinese) |
中文摘要 | Hough 轉換是一種常用於萃取影像中幾何要件的方法。標準Hough 轉換雖可以偵 測簡單線形,但由於轉換後位置偏移所造成之關連性誤差,使得應用於結構較複雜之幾何形 狀萃取時,效果未盡理想。 本文提出方向約制 Hough 轉換法,萃取數化航照中建物邊緣線 之直線。本方法使用鏈結碼之概念,以十二種圖型進行方向分析,除了可以減少轉換點數、 增加萃取效率以外,尚可提供線形物法角之預估值,以設定轉換區段,減低關連性誤差之影 響。 本研究利用實例,分析參數之影響;並以 SNR 指標、容錯指標、執行所需時間,評估方 向約制轉換與標準 Hough 轉換之間差異與效率。 以此方法萃取航測影像中地物特徵主要邊 緣線之主要目的,在協助後續辨識、認知工作之進行。 |
英文摘要 | Hough Transform is an effective method for extracting geometric primitives form image. However, the standard scheme suffers from the correlated error when the image content is complex. In this study, the orientation constrained Hough transform is proposed for the extraction of building edges from the scanned aerial photo. Based on the chain code concept, twelve etmplates are defined for the screening of line components to reduce the range of the parameter space. This procedure reduces the number of transformations required, and also limits the influence of the correlated error. Numerical experiments are performed with both the standard Hough transform and the proposed scheme. Three robustness indices, SNR, and the execution time are computed for evaluation. |
本系統中英文摘要資訊取自各篇刊載內容。