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研究生:黃英婷
研究生(外文):Ying-Ting Huang
論文名稱:影像鑲嵌自動化之研究
論文名稱(外文):A Study on Automation of Image Mosaicking
指導教授:蔡榮得蔡榮得引用關係
指導教授(外文):Victor J. D. Tsai
學位類別:碩士
校院名稱:國立中興大學
系所名稱:土木工程學系
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:中文
論文頁數:66
中文關鍵詞:影像鑲嵌接縫線影像處理自動化
外文關鍵詞:Image MosaickingSeam LineImage ProcessingAutomation
相關次數:
  • 被引用被引用:16
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攝影測量工作常廣泛應用於變遷偵測、環境影響評估、野外調查等,但由於攝影機的像幅、飛行載具航高限制,往往沒有辦法單用一張相片涵蓋整個區域,所以需藉由連續的拍攝,再將拍攝得到的影像鑲嵌成一整幅的影像,以供後續的判讀或是其他應用,因此影像鑲嵌對於影像整合而言是一項不可或缺的資料前處理步驟。
本研究對於影像鑲嵌的流程如特徵萃取、影像對位、影像接合、及影像灰階值調整等各步驟,逐一探討其自動化處理之方法,以減少人工干預。首先以Lue興趣操作元找出影像特徵點,以人工介入的方式先選取3對共軛控制點,建立兩張影像的對應座標轉換關係,以便提供特徵點的起始共軛點位資訊,使得在後續的影像匹配,能夠自動化並提高其匹配精度,並作為二張影像鑲嵌時接縫線接合萃取之參考。而在影像接合之前,採用直方圖匹配法,先對於兩張影像之環域重疊區域建立灰階值調整對照表,作為整張搜尋影像灰階值調整的依據,讓搜尋影像的整體對比調整與參考影像近似,使得整個鑲嵌影像在視覺上更為流暢。
Photogrammetry is widely used in change detection environment assessment, field investigations etc. However, it is difficult to cover the whole area of interesting with single photograph due to the limitation of the size of camera frame and the flying height of airborne. Therefore we have to mosaic all images that were taken continuously for following applications. Thus image mosaicking is a very important data process to the integration of images.
This research investigates the processes on automation of image mosaicking, such as feature extraction, image registration, merge of images, and adjustment of image gray value, in order to reduce manually intervening. First, image feature points were extracted by using Lue interest operator and three pairs of control points were chosen manually to establish the coordinate transformations between both images to provide initial information of conjugate control points for enhancing the accuracy of image matching, and to extract seam line of both images. Before merging images, a look up table of the buffer zones of the seam line was established using histogram matching for the adjustment of gray values of the searching image, such that to the global contrast of the searching image is similar to that of the reference image for much smooth appearance of the mosaiked image.
摘要…………………………………………………………………………Ⅰ
ABSTRACT……………………………………………………………………Ⅱ
目錄…………………………………………………………………………Ⅲ
圖目錄………………………………………………………………………Ⅴ
表目錄………………………………………………………………………Ⅶ
第一章 緒論…………………………………………………………………1
1- 1研究動機與目的………………………………………………………1
1- 2文獻回顧………………………………………………………………1
1- 3研究流程與方法………………………………………………………3
1- 4論文架構………………………………………………………………5
第二章 特徵萃取……………………………………………………………6
2- 1前言……………………………………………………………………6
2- 2興趣運算元……………………………………………………………7
2-2-1 Moravec興趣運算元………………………………………………7
2-2-2 Lue興趣運算元……………………………………………………9
2-3 興趣元的分析比較……………………………………………………11
第三章 影像對位……………………………………………………………16
3-1 前言……………………………………………………………………16
3-2 影像對位流程介紹……………………………………………………16
3-3 影像匹配………………………………………………………………20
3-4 標準化互相關法………………………………………………………23
3-5 目標視窗大小的決定及影響…………………………………………24
3-6 影像匹配成果之品質檢核……………………………………………25
第四章 影像鑲嵌……………………………………………………………27
4-1 前言……………………………………………………………………27
4-2 接縫線選取……………………………………………………………27
4-2-1最小灰階值差絕對值和……………………………………………28
4-2-2最小成本路徑搜尋法………………………………………………29
4-3 影像重疊區……………………………………………………………31
4-4 影像接合………………………………………………………………35
第五章 實驗與結果分析……………………………………………………43
5-1 實驗影像與流程………………………………………………………43
5-2 實驗結果………………………………………………………………44
5-3 成果分析與比較………………………………………………………52
第六章 結論與建議…………………………………………………………54
參考文獻 ……………………………………………………………………57
附錄A 圖4-14灰階值調整對照表…………………………………………59
附錄B 圖4-14接縫線點位座標表…………………………………………61
附錄C 圖5-7灰階值調整對照表……………………………………………65
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