Error in the function

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Anca Chivulescu
Anca Chivulescu 2021-6-7
评论： Anca Chivulescu 2021-6-9
hello! I'm having a litle trouble while running my code. I've hidden a text document behind a picture and i wish by decoding it to be able to see the hideen text. Somehow it seems something is not right because it apears in the matlab workspace in a vector form. is it posible to see the initial text? i've used the ASCII code...
my code
I=imread('im1.png');
function [dec_text]=decodare_txtf(I)
[row, col] = size(I);
dec_text = zeros(1, row);
pas = col/4;
for i = 1 : row
aux = 0;
aux = uint8(aux);
for j = 1:4
aux = aux * 2^2;
aux = aux + mod(I(i,j*pas), 2^2);
end
dec_text(i) = char(aux);
end
text = char(dec_text);
A = mat2str(text);
imshow('im1.png'),title('Imagine decodata');
disp(A);
end
i've attached the files in question.
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Walter Roberson
Walter Roberson 2021-6-7
After you assign the imread to I, you need to make a call to the function. Matlab does not not assume that the function should be called just because it is present in the file.

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KSSV
KSSV 2021-6-7
You need to save the below code into a function named: decodare_txtf.m in some folder.
function [dec_text]=decodare_txtf(I)
[row, col] = size(I);
dec_text = zeros(1, row);
pas = col/4;
for i = 1 : row
aux = 0;
aux = uint8(aux);
for j = 1:4
aux = aux * 2^2;
aux = aux + mod(I(i,j*pas), 2^2);
end
dec_text(i) = char(aux);
end
text = char(dec_text);
A = mat2str(text);
imshow('im1.png'),title('Imagine decodata');
disp(A);
end
After saving the function, you should add it's path or make that folder as present working directory and call the function.
I=imread('im1.png');
[dec_text]=decodare_txtf(I) ;
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Anca Chivulescu
Anca Chivulescu 2021-6-8
Thank you so very much!
Anca Chivulescu
Anca Chivulescu 2021-6-9
I've changed both the text length and image size. 1024/1024 and it worked. Thank you for your help!

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