Introduction - If you have any usage issues, please Google them yourself
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.)