给出三组分别带有高斯噪声和salt&pepper噪声的图片，对他们进行直方图均衡化，然后分别用中值滤波器和均值滤波器对所有图片进行滤波，比较结果

-1. Given an original and its noised images.

2. Histogram Equalization with random additions

3. 3 by 3 median filter window (Calculate the median value among 9 values, and

set the middle pixel value with the median.)

4. 3 by 3 averaging filter window (Take the average value of 9 pixels, and set

the middle pixel value with the average.)