实用的matlab代码：中值滤波器；用Sobel算子和拉普拉斯对图像锐化；梯度算子检测边缘；LOG算子检测边缘；Canny算子检测边缘-Practical matlab code: median filter Sobel operator and Laplacian image sharpening gradient edge detection operator LOG operator to detect the edges Canny edge detection operator