How to solve Index exceeds matrix dimensions?

Question

Martina Polachová 2017-11-13

0
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https://ww2.mathworks.cn/matlabcentral/answers/366823-how-to-solve-index-exceeds-matrix-dimensions

评论： Martina Polachová 2017-11-13

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