关键词: 遥感图像, 主溜线, 轮廓跟踪, 动态演进

Abstract: The tendency of the Yellow River’s mainstream line directly affects the flood prevention decision-making and planning. The existing method of evolving mainstream line needs to calculate the direction of the river at every step. A straight pretreatment method is proposed in this paper. First, it uses spectral similarity principle to extract the region of the river, then exerts contour?tracking algorithm to get external boundary of the river, and finally utilizes linear interpolation to transform the river image in curve external boundary to a straight image. Next, it evolves the mainstream line dynamically in straight image and inversely maps to original image. The results of the experiment show that this method can avoid detecting the river direction frequently and simplify the evolution model of mainstream line without reducing the error precision.

Key words: remote sensing image, mainstream line, contour?tracking, dynamically evolve