利用角点检测能提取网格图像的节点，并对破损的节点进行自动检测，识别破损节点所在的行数和列数，很适合检测栅栏的破损程度-Corner detection can be extracted using the image grid nodes, and automatically detects damaged nodes, where nodes identify the damaged rows and columns, it is suitable for detecting the extent of damage the fence