说明：  (1)利用高斯滤波器函数，用Matlab语言，编写Canny边缘检测器的Matlab（或C语言）函数； (2)利用上述函数，对一副图像（椒盐噪声或高斯噪声）进行边缘检测； (3)利用Matlab自带的Canny边缘检测函数对同一副图像进行边缘检测； (4)比较上述两个结果。
((1) the use of Gaussian filter function, using Matlab language, the preparation of Canny edge detector Matlab (or C language) function (2) the use of the above-mentioned function, an image of the (salt and pepper noise or Gaussian noise) for edge detection (3) the use of Matlab built-in Canny edge detection function to the same Vice-image edge detection (4) compare the results of the two.)