用vb实现了对图片的读取和显示，并对图像进行高斯平滑，灰度图像直方图的显示。还主要实现了图像轮廓的边缘检测：包括各种算子检测。-Achieved using vb read and display the picture, and Gaussian smoothing the image, gray image histogram. Also outline the main achievement of the image edge detection: including operator testing.