分水岭的计算过程是一个迭代标注过程。分水岭比较经典的计算方法是L. Vincent提出的。在该算法中，分水岭计算分两个步骤，一个是排序过程，一个是淹没过程。首先对每个像素的灰度级进行从低到高排序，然后在从低到高实现淹没过程中，对每一个局部极小值在h阶高度的影响域采用先进先出(FIFO)结构进行判断及标注。(The watershed computation process is an iterative annotation procedure. Watershed comparison, the classic method of calculation is L. Vincent proposed. In the algorithm, watershed computation is divided into two steps, one is the sorting process, and the other is the inundation process. Firstly, gray level of each pixel are ordered from low to high, then from low to high achieving submerged process, for each local minimum in order h height influence domain using FIFO (FIFO) structure judgment and annotation.)