Write a Matlab code to read rice.png image and to do the following:

1. Add salt and pepper noise into the rice image (img1) of amount 0.05 and save it in a noisy_img.
2. Apply a 5 5 average filter with replicate border into the noisy_img, and display the result.
3. Apply a 3 3 median filter into the noisy_img, and display the result.
4. Apply a Gaussian low-pass filter on the noisy_img with D0=36 and D0=18 and display the results