画像のRGB空間における濁水の立体分布と３次元ベクトル空間モデルを用いた流況変化検知手法の基礎的検討

抄録

In this report, we introduce a new method for automatically detecting flow-regime changes using unit vectors and the normal unit vector of RGB values from camera imagery. Although the method is still under development, it is expected to lead to further enhancement of the monitoring system for sediment disasters. From the results of a casestudy at the Inari river in Nikko, Japan, it is suggested that the RGB unit vectors may have eigenvalues according to different types of water color : e. g., clear water, turbid water, and debris flow color. It is also suggested that the RGB unit vectors can draw a curve among the unit vectors of pre and post-turbidity colors. Furthermore, even if the amount of solar radiation changes, the RGB unit vectors can indicate almost stable values.