matlab实现的DFS算法，可以计算二值图像的连通区域的数目和各个区域的像素数-matlab implementation of the DFS algorithm can calculate the number of binary image of connected regions and across regions, the number of pixels

求取图像的最大连通域，像素点，及连通分量中心-Obtaining an image of the largest connected domain, pixels, and connected component center