Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2808
標題: 分支切割技術應用於結構光與數位光彈相位展開之研究
Branch cutting technique studies on structured light and digital photoelasticity applications
作者: 張曜庭
Zhang, Yao-ting
關鍵字: 結構光;structured light;數位光彈;分支切割技術;形貌不連續;digital photoelasticity;branch cutting technique;physical discontinuities
出版社: 機械工程學系所
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摘要: 
本文提出調整門檻的跳躍點搜尋方法,以跳躍點引導同性不連續點的分支切割,解決了結構光表面輪廓量測的形貌不連續問題,分支切割的參考點被擴增到幾倍,讓同性不連續點找到正確的分支切割路徑,標定出形貌不連續的輪廓,實驗結果證明極為複雜的形貌不連續問題,也可以清楚標定出分支切割連線,修補形貌不連續的區域邊界斷裂情形,最後完成區域型相位展開。

一個分支切割演算法被提出,把光彈相位圖的等傾角與等色線去耦合關係,解決了等傾角包裹相位造成的等色線不連續。不是以像素點與像素點的處理方式,分支切割等傾角包裹圖經過修補區域的方法重建,證明比早期的演算法更節省時間與有效率地,等色線的數據去耦合後可以很輕鬆處理。本研究使用兩種類型的模擬樣本,具有等力點與無等力點的樣本,詳細說明等傾角和等色線彼此之間如何的互相影響,和本研究去耦合的方法。實驗證明新開發的演算法是有效性、穩健性和簡單性。

A method of adjustment threshold of the jump points search is proposed in this paper. The jump points guide the same polarity discontinuity points in the branch cut. It can solve physical discontinuities in the surface profile measurement of the structured light. The reference points of the branch cut is expanded several times. Let the same polarity discontinuity points find the correct branch cutting path, and pointed out the physical discontinuities contours. Experimental results show that even a physical discontinuities is very complex, the branch cutting can also be clearly and correctly calibrated. It repairs the regional boundary fracture caused by physical discontinuities, and finally completes the regional phase unwrapped.

A branch cutting algorithm is proposed to solve the wrapped isoclinic causing isochromatic discontinuity and thus to decouple the isoclinic-isochromatic interaction of photoelastic phase maps. Rather than pixel by pixel, the branch-cutting isoclinic wrapped map is then restored by a modified regional approach and is proved to be more time-effective and less effort needed than the earlier algorithm. The decoupled isochromatic data can be handled easily afterward. Two type of simulated samples (i.e., specimens with and without isotropic points) are used to detail why and how isoclinic and isochromatic are interactive with each other and the decoupling method of the present study. Experimental works prove the effectiveness, robustness and simplicity of the newly developed algorithm.
URI: http://hdl.handle.net/11455/2808
其他識別: U0005-0508201214511900
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