頁籤選單縮合
題 名 | 光彈等色線條紋細線化之數位影像處理方法=A Digital Image Processing Method for Isochromatic Fringe Sharpening of Photoelasticity |
---|---|
作 者 | 洪光民; 馬劍清; 曾垂拱; | 書刊名 | 國立臺灣大學工程學刊 |
卷 期 | 87 2003.02[民92.02] |
頁 次 | 頁57-69 |
專 輯 | 「機械工程」專輯 |
分類號 | 440.13 |
關鍵詞 | 數位光彈; 等色線; 暗場; 亮場; 細線化; 畫素; Digital photoelasticity; Isochromatics; Dark-field; Light-field; Sharpening; Pixel; |
語 文 | 中文(Chinese) |
中文摘要 | 一般而言光彈實驗中所獲得的等色線條紋大都有不等的寬度,而由於決定條紋中心線的不確定性,因而限制了實驗結果的正確性,本文中提出了一套簡潔的光彈等色線細線化的影像處理方法,這套方法可獲得一個畫素寬度的四分之奇數條紋序號等色線條紋圖,而這些條紋比一般的暗場或亮場的條紋數多一倍且能正確的顯示光彈實驗的結果,本文中亦應用一套以氦氖雷射光為光源的緊密式數位光彈系統擷取圓盤受局部均佈壓力的等色線條紋,並由本文所提出的細線化方法對此圓盤試片之等色線條紋作處理後所得的四分之奇數序號條紋與理論計算的結果做全場的比對有十分一致之結果。 |
英文摘要 | The isochromatic fringes obtained from photoelastic system are broad bands instead of thin lines. The uncertainties in the locations of fringe centerlines affect the accuracy of the experimental result. In this paper, a simple image processing method is presented for isochromatic fringe sharpening. This method produces highly sharpened isochromatic fringe contours with only one pixel width at quarter of odd fringe order locations. The result is a pattern of isochromatic fringe contour with twice as many as those in the light field or dark field and provides enhanced accuracy of experimental data for photoelastic analysis. A Compact optic system for digital photoelasticity using a He-Ne laser as light source is used to obtain the digital images of isochromatic of a circular disk subjected to diametral distributed compression. The quarter of odd order isochromatic fringes obtained by the proposed image processing method have good agreements with the theoretical ones over the full field. |
本系統中英文摘要資訊取自各篇刊載內容。