说明：  被处理的图象X(二值图象，我们针对的是黑点)，中间是结构元素B，那个标有origin的点是中心点，即当前处理元素的位置。腐蚀的方法是，拿B的中心点和X上的点一个一个地对比，如果B上的所有点（指的是所有黑点）都在X的范围内（即X图上处理元素所在的位置以及它上，左两个点都是黑色），则该点保留，否则将该点去掉（变为白点）；右边是腐蚀后的结果。可以看出，它仍在原来X的范围内，且比X包含的点要少，就像X被腐蚀掉了一层。
(The processed image X (two value images, we are aiming at black spots), the middle is the structure element B, and the point with the origin is the center point, that is, the position of the current processing element. The method of corrosion is to compare the center point of the B with the point on the X, and if all the points on the B are in the range of the X (that is, the location of the element in the X diagram and on it, the left two points are black), the point is retained, otherwise the point is removed (to the white point); the right is rotten. The results after the eclipse. It can be seen that it is still within the scope of the original X, and fewer points than X, just as X has been eroded.)