MATLAB: Constructiong 3×3 matrix window

Question

I am designing a filter removing impulses noises from an RGB IMAGE

For identifying the noise pixels in the image I need a 3×3 window to slide over the image starting from the first Pixel to the Last.

If the corrupted Pixel is found i have to do some calculation to correct it.

To find this Corrupted Pixel I need a 3×3 Window to slide over my Image.

please send me the code for this

Answer 1

Hint - the CONV command