这是一个边缘检测程序,提取最大连通区域的边缘-This is an edge detection program to extract the edge of the largest connected region

数米粒，matlab编程实现图片中米粒边缘的提取，然后实现连通域的标记，最后统计连通域个数-Number of rice, matlab programming rice extract picture edges, then realize marking connected domain, the number of connected domains final statistics