说明：  这段程序实现了对图像的膨胀运算，针对的都是黑色点。参数中有一个BOOL变量，为真时，表示在水平方向进行膨胀运算，即结构元素B为(1 ，1. ，1)否则在竖直方向上进行膨胀运算，即结构元素B为1 1.1 。
(this program for the expansion of computing image has been aimed at Black Point. Parameters have a BOOL variable to true, in the horizontal direction for expansion of computing, the structural elements of B (1, 1. , 1) in the vertical direction or on the expansion of computing, the structural elements of a B 1.1.)