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I need help creating a Mean Filter for Matlab 3 by 3. ( I need the...

I need help creating a Mean Filter for Matlab 3 by 3.
( I need the Actual Matlab WORking code) It's dude tomorrow, final project worth 40% of my grade.

It can not use Matlab Function, must be user define fuction.
So far what I have is, I am not sure how to start this, I was told it requires 2 for loops


A= imread('lena_256.tif'); % Reads the image in matrix

M = ones(3,3)/9; % Creates a matrix of 3 by 3 with value of 1/9

The project must have
- Prompt the user to pick a number of times to run the filter. Run the filter multiple times over the image (using the result in the next run each time).

- Find Variance of image

- Find the signal to noise ratio for filter image

a.How much has the image degraded from orgional Image?

b.How does this correlate the histograms?

Please add comments for me to understand what each line does.
Thank You!!!!!!

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