碩士 / 國立臺灣海洋大學 / 海洋環境資訊學系 / 96 / The purpose of this study is to verify the feasibility of feature tracking method on the images taken by a digital camera near the coastal area. This technology is applied to the surface circulaton at Yin-Yang Bay at the northeast of Taiwan with an obvious front of cloudy yellow fresh water and clear brine. The primary imagery taken at Yin-Yang Bay has to do geometric transformation, image smoothing and edge detection before works on feature tracking. Two feature tracking methods are used in this study: the subjective method of estimating distance among the sequence images by naked eyes, and the objective method of Maximum Cross Correlation (MCC). The results show that the velocities of surface currents at Yin-Yang Bay derived from both methods are similar and are compactable to the results of previous study. Under a similar condition of the end of ebb closing to neap tide, there is only 2% difference between this study and previous study. This indicates that the method developed in this study is suitable for coastal circulation research. From the feature tracking method, not every front velocity can perform the behavior of tidal current. Nevertheless, the front velocity in neap tide is slower than that in spring tide.
Keywords：Yin-Yang Bay, Coastal circulation, Feature tracking, Maximum cross correlation, Digital imagery
| Identifer | oai:union.ndltd.org:TW/096NTOU5282011 |
| Date | January 2008 |
| Creators | Kun-Cheng Hsieh, 謝坤成 |
| Contributors | Chung-Ru Ho, 何宗儒 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 65 |
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