The meaning of code on this program

Hi.

That is a code which produce a difference picture on Matlab.

That is my professor code, but i cannot fully understand.

The knowledge point is image on Matlab.

% read an image: imread()

% show an image: imshow()

% eg.

clear, close all

I = imread('pout.tif'); % read

for i = 1:size(I,1)

for j = 1:size(I,2)

if (rem(i,2)==0 && rem(j,2)==0)

I(i,j) = 0;

end

end

end

% show a image

imshow(I);

What is the meaning of i = 1:size(I,1) and what is the purpose of rem(i,2) == 0 && rem(j,2) == 0;

Thank you all.

Answer 1

[KSSV]

clear, close all
I = imread('pout.tif'); % this is to read the image pout.tif 
for i = 1:size(I,1)   % this is loop from 1 to number of rows of the image (REad abou the fnction size)
    for j = 1:size(I,2) % this is loop from 1 to number of columns of the image. So basically the loops cover each pixel of the image i.e. each and every element of matrix
        if (rem(i,2)==0 && rem(j,2)==0)  % if the row, collumn is even 
            I(i,j) = 0; % repalce the pixel by 0 
        end
    end
end

You can try yourself everything instead of asking a question. Read the documentation of rem.