抗旋轉性地貌影像比對法之研究

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Title:	抗旋轉性地貌影像比對法之研究
Other Titles:	A Research of Rotation Invariant Terrain Matching Method
Authors:	田豐;朱建鋒
Contributors:	淡江大學航空太空工程學系
Keywords:	地形地貌比對;快速傅立葉轉換;抗旋轉;Terrain Contour Matching;Fast Fourier Transform;Rotation Invariant
Date:	1998-12
Issue Date:	2014-03-07
Abstract:	本研究使用二維數位影像地圖來做實測影像與參考影像之間的比對, 並且正確的找出實測影像在參考影像上的位置。主要任務是考慮此辨認法之抗旋轉(Rotation Invariant)特性, 作法分為兩個部分:第一, 先在頻域上做粗尋, 在影像上取一近似圓形的面積並分別對此近似圓面積的半徑R與角度.THETA.兩個方向來抽取影像像素值(Pixels)存成一個N*M的二維陣列, 並對此二維陣列做快速傅立葉轉換(FFT)得到影像的特徵, 用此特徵來比對找出目標粗略位置。第二, 在粗尋所找出的影像範圍中, 回到時域上做細尋比對。以本方法在頻域上處理比對可以提供具抗旋轉特性的影像辨識能力, 加上粗細格搜尋法的辨識概念, 是為了增進處理速度。希望本抗旋轉地貌影像比對法能夠在預先設定的巡航路徑中途點提供正確位置參考訊號給飛行載具來修正位置誤差。 This paper provides an anti-rotation terrain matching method. We used two-dimension digital terrain image to perform terrain matching and locate the correct position of the sensed image. This method can be divided into two steps. First, use a two-dimensional Fast Fourier Transform(2DFFT) to do image matching in frequency domain, and find the proper area that contains the sensed image. Second, return to time domain to do an image matching in the previous chosen area. Process in frequency domain can provide better anti-rotation matching ability. We expect this method can provide flying vehicles a way to correct position error.
Relation:	中國航空太空學會八十七年年會暨第四十屆學術研討會論文集(下冊)，頁635-638
Appears in Collections:	[Graduate Institute & Department of Aerospace Engineering] Proceeding

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