Toboggan algorithm is an important tool to image segmentation, and the result of image segmentation depends on how to compute the gradient image to a great extent if applying toboggan to it.

• 摘要滑降算法是一种重要的图像分割工具，然而基于滑降算法的图像分割在很大程度上依赖于待分割图像梯度的计算。