IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Development of uav-based river surface velocity measurement by stiv based on high-accurate image sta...
Development of uav-based river surface velocity measurement by stiv based on high-accurate image stabilization techniques
ses a new image analysis method to measure river surface velocity distributions from video images
obtained from an unmanned aerial vehicle (UAV). The method is mainly comprised of two procedures, i.e. an image
stabilization procedure and a procedure for velocity measurement. In the image stabilization procedure, the blur included
in the video images were corrected both accurately and efficiently by combining two novel image processing schemes: the
Rotation Invariant Phase Only Correlation (RIPOC) and the Scale Invariant Feature Transform (SIFT). The surface flow
measurements were conducted by applying the space-time image velocimetry (STIV) developed by the authors, which
traces the advection of surface features such as ripples or floating objects. The method was applied to a 2014 snowmelt
flood of the Uono River in Japan with success of measuring water surface velocity distributions that covers a river reach of
about two hundred meters with a width of about 150 meters. The accuracy of the method was evaluated through a
comparison with the data obtained by a boat-mounted ADCP that measured the same area in a zigzag manner. Surface
velocity distributions measured by STIV using video images taken from a river bank were also used for comparison. The
results showed good agreement with the above two methods.Form Required :
File Size : 5,626,783 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 19/08/2015
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