图元识别：数字化图像是一个m*m的像素矩阵。每个像素要么为0，要么为1。识别图元就是对图元像素进行标记，当且仅当两个像素属于同一图元时，他们的标号相同-map Identification : digital image is an m * m pixel matrix. Each pixel either 0 or 1. Recognition is the right map billion yuan pixel map marking, if and only if two pixels belonging to the same map yuan, the same label