中文说明：对图像进行高斯滤波后再提取边缘 对图像进行金字塔各层图像进行sobel提取边缘。内附有原图，处理后的效果图及程序结果说明。
English Description：
The edge of the image is extracted after Gaussian filtering, and the edge of each layer of the image is extracted by Sobel. The original picture, the effect picture after treatment and the explanation of program result are attached.