本程序目的是分别采用Roberts算子、Sobel算子、Prewitt算子、Kirsh算子（8方向）、拉普拉斯算子对2幅灰度图像进行边缘检测。其中，一幅图像边缘比较明显，另一幅则比较“平坦”。对这些方法给出简要评价。-The purpose of this program were to adopt Roberts operator, Sobel operator, Prewitt operator, Kirsh operator (8 directions), the Laplace operator on the two gray-scale image edge detection. , The edge of the image, the other one is more "flat". Give a brief evaluation of these methods.