用形态学操作剪除毛刺（毛刺像素不要过大）。

描述：输入X是一个二值图像，n是预估的毛刺像素长度输出和X相同大小的去毛刺图像。方法就是形态学操作，膨胀腐蚀再和原图像做交-Morphological operations to cut off burrs (burr pixels not too big). Descr iption: The input is a binary image X, n is an image projected deburring burr length of the output pixel size, and X are the same. The method is morphological operations, dilation and erosion and the original image and then do post