在现代医学中，口腔正畸过程中重要的一步是制定正畸方案，计算机模拟牙齿移动轨迹可以很好地帮助医生制定方案。而现有的资源需要医生手动勾勒出每颗牙齿的轮廓，实现这一过程的自动化将有助于提高医生的工作效率。针对这一实际问题，本文主要研究如何从牙齿石膏模型图像中分割每颗牙齿。本文采用数学形态学进行图像预处理，采用分水岭算法进行牙齿分割,通过深度优先搜寻算法获得最终分割线。

In modern medicine, an important step in the orthodontic process is to develop an orthodontic solution. Computer simulation of the tooth movement trajectory can help the doctor to develop a plan. Existing resources require doctors to manually outline the contours of each tooth, and automating this process will help improve physician productivity. In response to this practical problem, this paper focuses on how to segment each tooth from the dental plaster model image. In this paper, the mathematical morphology is used for image preprocessing, the watershed algorithm is used to segment the teeth, and the final segmentation line is obtained by the depth-first search algorithm.