How to solve Index exceeds matrix dimensions?

Hello, can anybody please give me advices how to solve this: I have 3 images and I would like to noise this images with 2 kind of noise and save to cell array. When I have cell array 3x3 it works well. It looks like this:

clc, clear all, close all
a = imread ('mri1.jpg')
b = imread ('mri2.png')
im3 = imread ('mri3.jpg')
im1 = rgb2gray (a)
im2 = rgb2gray (b)

pole = {im1 false false ;
        im2 false false ;
        im3 false false }

[n,m]=size(pole);

for i = 1 : m
   for j = 1 : n
    if j == 2
        pole{i,2} = imnoise (pole{i,1},'salt & pepper',0.02);
    end

     end    
  end

for i = 1 : m
   for j = 1 : n
    if j == 3
        pole{i,3} = imnoise (pole{i,1},'salt & pepper',0.1);
    end

     end    
  end

But when I decided to give to cell array next column (where I would like to save other kind of noise) it collaps with error: Index exceeds matrix dimensions. It looks like:

clc, clear all, close all
a = imread ('mri1.jpg')
b = imread ('mri2.png')
im3 = imread ('mri3.jpg')
im1 = rgb2gray (a)
im2 = rgb2gray (b)

pole = {im1 false false false;
        im2 false false false;
        im3 false false false}

[n,m]=size(pole);

for i = 1 : m
   for j = 1 : n
    if j == 2
        pole{i,2} = imnoise (pole{i,1},'salt & pepper',0.02);
    end

     end    
  end

for i = 1 : m
   for j = 1 : n
    if j == 3
        pole{i,3} = imnoise (pole{i,1},'salt & pepper',0.1);
    end

     end    
end

for i = 1 : m
   for j = 1 : n
    if j == 4
        pole{i,4} = imnoise (pole{i,1},'gaussian',0.1,0.01);

end

 end 

end

How should I solve this?

Answer 1

[Jose Marques]

Have you verify the size of the images? They must be the same.

[Martina Polachová]

The size of the images is not the same. I thought the cell array could contain pictures of different sizes.