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數位影像相關係數法於鏡頭扭曲校正之應用 = Application of...

國立高雄大學土木與環境工程學系碩士班

數位影像相關係數法於鏡頭扭曲校正之應用 = Application of Digital Image Correlation Method to Calibration of Lens Distortion

紀錄類型:	書目-語言資料,印刷品 : 單行本
並列題名:	Application of Digital Image Correlation Method to Calibration of Lens Distortion
作者:	蔡福泰,
其他團體作者:	國立高雄大學
出版地:	[高雄市]
出版者:	撰者;
出版年:	2012[民101]
面頁冊數:	132面圖，表格 : 30公分;
標題:	數位影像相關係數法
標題:	Digital Image Correlation method
電子資源:	http://handle.ncl.edu.tw/11296/ndltd/39931734433268650838
附註:	參考書目：面114-116
摘要註:	近年來，土木工程在許多地方開始使用數位影像量測的方式，取代傳統的量測方法，因為利用數位影像量測，僅需相機及架設相機之相關設備，不需要對拍攝物體作太多的處理，不必因應不同的量測物體而使用多種不同的量測器具，亦不會產生破壞，即可利用電腦處理分析影像之數據。而影像量測中最常見之問題為鏡頭的徑向扭曲，會使影像產生桶狀或枕狀變形，使得影像座標偏離原始座標。因此需進行鏡頭扭曲校正，方能確保此方法的量測精準度，此為數位影像量測之一重要研究課題。過去在校正徑向扭曲時，皆是以影像中心為扭曲中心進行校正還原，沒有考慮到真正的扭曲中心可能會偏離影像中心，如此可能會影響到校正之效果。因此本研究針對扭曲中心偏離影像中心之影響進行探討並改良扭曲中心之計算方式。此外，本研究利用數位影像相關係數法原理進行分析，同時以二維平面網格校正法及三維立體平面校正法進行校正並比較兩者的效果，比較後發現使用平面網格法會遇到試體有在空間中歪斜的三維問題需解決，而使用三維平面法則是尚無校正效果較好之五次式方程式求解，因此本研究提出將此二法結合使用互補其不足的整合校正法。分析結果顯示，整合校正法在二維平面時XY方向之標準差，以及三維平面對應節點座標Z方向差之標準差，皆可比單獨使用平面網格校正法亦或三維平面校正法有更好的校正效果，有效降低標準差。 In recent years, instead of traditional measurement method, digital image measurement technique has been widely used in civil engineering. The utilization of digital image measurement technique has many advantages such as it needs only cameras and equipment to fix cameras, no complicated treatment is necessary for the observed objects, this method is suitable for different objects and it will not damage the observed objects. However, lens radial distortion is a common problem in the digital images measurement technique. Lens radial distortion can result in barrel- or pincushion-shape deformation and cause the image coordinates to diverge from its’ original coordinates. Therefore, how to calibrate the lens distortion to ensure the accuracy of this technique is an important research topic.In the past, most researches assume that the center of distortion locates at the center of the image while calibrating radial distortion. Ignoring the possibility that the center of distortion can deviate from the image center can affect the effect of calibration. Therefore, this study discusses how the calibration result will be affected when the center of distortion diverges from the center of image, and an improved method to compute the center of distortion is proposed.In addition, this study uses the theory of digital image correlation method to in the process of calibration analysis. Both the two dimensional planar grid calibration and the three dimensional plan calibration are discussed in this study. It is found that the specimen plan does not parallel to camera in 3D space can seriously affect the result while using the 2D planar grid calibration. Furthermore, there is still no five-order model while using the 3D plan calibration. Therefore, we combined the 2D and the 3D calibration methods into the integrating calibration.When compared with the results yielded by using the 2D planar grid calibration and the 3D plan calibration methods, the results show that using the integrating calibration can effectively improve the accuracy of coordinates in all three directions.

數位影像相關係數法於鏡頭扭曲校正之應用 = Application of Digital Image Correlation Method to Calibration of Lens Distortion
蔡, 福泰

數位影像相關係數法於鏡頭扭曲校正之應用 = Application of Digital Image Correlation Method to Calibration of Lens Distortion / 蔡福泰撰 - [高雄市] : 撰者, 2012[民101]. - 132面 ; 圖，表格 ; 30公分.
參考書目：面114-116.
數位影像相關係數法Digital Image Correlation method

數位影像相關係數法於鏡頭扭曲校正之應用 = Application of Digital Image Correlation Method to Calibration of Lens Distortion
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