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題名 | On the Video Image of Particle Streaks=質點顆粒的電視軌跡影像 |
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作者姓名(中文) | 翁宗賢; | 書刊名 | 國立臺灣大學工程學刊 |
卷期 | 63 1995.02[民84.02] |
頁次 | 頁47-66 |
分類號 | 440.137 |
關鍵詞 | 流場顯影; 質點影像; CCD攝影機; 影像處理; Flow visualization; Video image; CCD camera; Image processing; |
語文 | 英文(English) |
中文摘要 | 近代的流場顯影常應用電子藕合裝置(CCD)攝影機來攝取流場中的質點 顆粒影像,例如內含時間碼的數量化流場顯影技術,能即時產生彩色的質點軌 跡,但這些軌跡線段常有不連續的現象,導致速度判讀的困難。本文以流場顯影 的觀點,首先介紹CCD攝影機的基本架構與操作原理,按著探討及分辨這些硬體 設備造成的幾種不連續軌跡的類型與成因,包括流場狀況所引致的軌跡不連續。 部份輕度的不連續軌跡可藉由數學型態介析的影像處理,以改善部份軌跡不連續 的線段,最後將軌跡影像細線化,有效率地計算出流場的速度向量。 |
英文摘要 | A color-coded particle tracking velocimetry (CCPTV) was recently developed togenerate time-coded streaks by a direct imaging technique using a charge-coupleddevice (CCD) camera. However, the grabbed trajectories of particles are oftencomposed of fragments which may complicate extraction of velocity vectors. Toidentify patterns of streak discontinuities, architectural structures of CCD camerasand their operation principles are reviewed from the view point of flow visualization.The video image of a typical particle is recorded and its representative positionis analyzed. For a moving particle, four types of streak discontinuities can becategorized and their causes are discussed. To smooth out the grabbed streaks, amorphological image processing can effectively fill up interline discontinuities due tothe interlaced video scanning format. Finally, method for velocity extraction fromtime-coded streaks is summarized. |
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