图像各种边缘检测算子的比较，包括介绍了四种边缘检测算子包括Roberts边缘检测算子、Sobel边缘检测算子、Prewitt边缘检测算子和高斯—拉普拉斯边算子-Image a variety of edge detection operator of comparison, including the introduction of the four edge detection operator, including Roberts