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DOI | 10.1002/2017WR021913 |
On the Texture Angle Detection Used in Space-Time Image Velocimetry (STIV) | |
Tsubaki, Ryota | |
2017-12-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:12 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | The space-time image velocimetry (STIV) method evaluates the velocity of a water surface by analyzing a texture angle within a space-time image (STI) obtained from an image sequence of the flowing water's surface. The brightness gradient tensor (BGT) has been utilized for calculating the texture angle of the STI within the original STIV. The BGT is sensitive to image quality, especially high-frequency noise, and this fact limits the capability and accuracy of the velocity estimation. The objectives of this study were to understand why the BGT is sensitive to high-frequency noise and how to resolve this defect. In the manuscript, derivation of the BGT is first reviewed and then a geometric representation of the BGT is discussed. The reason the BGT is sensitive to high-frequency noise is also discussed, and, then, based on geometric representations of the BGT, a measure to improve this defect is proposed. To demonstrate differences between the two methods, texture angles from artificial and field image sets were also analyzed using the BGT and the improved BGT. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423299000051 |
WOS关键词 | LSPIV |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21532 |
专题 | 资源环境科学 |
作者单位 | Nagoya Univ, Dept Civil Engn, Nagoya, Aichi, Japan |
推荐引用方式 GB/T 7714 | Tsubaki, Ryota. On the Texture Angle Detection Used in Space-Time Image Velocimetry (STIV)[J]. WATER RESOURCES RESEARCH,2017,53(12). |
APA | Tsubaki, Ryota.(2017).On the Texture Angle Detection Used in Space-Time Image Velocimetry (STIV).WATER RESOURCES RESEARCH,53(12). |
MLA | Tsubaki, Ryota."On the Texture Angle Detection Used in Space-Time Image Velocimetry (STIV)".WATER RESOURCES RESEARCH 53.12(2017). |
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