程序的功能是对载入的图像进行边缘检测，检测的算子有微分算子、梯度算子、prewitt算子、roberts算子、sigma算子、sobel算子和canny算子。-Function of the program is loading the image edge detection, detection of a differential operator operator, gradient operator, prewitt operator, roberts operator, sigma operator, sobel operator and canny operator.