add text to photos please check my code, latest_data(i,j,k)=candidate_Image(i,j,k)-mod(candidate_Image(i,j,k),2)+M(count,1);

Asked by ahmad assahab on 22 Nov 2019 at 18:09

Latest activity Commented on by ahmad assahab on 4 Dec 2019 at 9:02

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candidate_Image=('apa.jpg'); %load the image
M = 'rahasia.txt'
rahasia=fopen (M,'rb'); %open secret file
[M,L] = fread(rahasia,'ubit1'); %read secret file as bin array
% L is the length of secret file
[n,m]=size(candidate_Image); %n is width, m is height*3
m=m/3;
%m*n is the max size to save secret
if (m*n*3<L)
    msg=msgbox('your picture is too small','size error','modal');
    pause (1);
    if (ishandle (msg))
        close (msg);
    end
end
latest_data=candidate_Image;
count=1;
for i=1:m %width
    for j=1:n %height
        for k=1:3 %RGB
            latest_data(i,j,k)=candidate_Image(i,j,k)-mod(candidate_Image(i,j,k),2)+M(count,1);
            if count==L
                break;
            end
            count=count+1;
        end
        if count==L
            break;
        end
    end
    if (L==count)
        break;
    end
end
imwrite(latest_data, 'encrypted_Image.jpg', 'bmp');
CC=M;
countl=l;
for i=l:m
    for j=l:n
        for k=l:3
            CC(countl)=latest_data(i,j,k)-candidate_Image(i,j,k);
            if countl==L
                break
            end
            countl=countl+l
        end
        if countl==L
            break
        end
    end
    if countl==L
        break
    end
end

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Answer by Image Analyst on 22 Nov 2019 at 18:39

hide_text_in_image.m

What does that way under-commented code do? Is it steganography where you're hiding/encoding text in the image pixels? If so, see my attached example.

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Image Analyst on 22 Nov 2019 at 21:20

That sets the folder to the folder where the demo images are that ship with MATLAB. You can change it to whatever you want. Replace it with

folder = uigetdir();

startingFolder = 'c:/users/ahmad/wherever you want';
folder = uigetdir(startingFolder);

You can save the stego image if you want:

% Get the name of the file that the user wants to save.
% Note, if you're saving an image you can use imsave() instead of uiputfile().
startingFolder = userpath % Or "pwd" or wherever you want.
defaultFileName = fullfile(startingFolder, '*.*');
[baseFileName, folder] = uiputfile(defaultFileName, 'Specify a file');
if baseFileName == 0
	% User clicked the Cancel button.
	return;
end
fullFileName = fullfile(folder, baseFileName)
imwrite(stegoImage, fullFileName);

ahmad assahab on 23 Nov 2019 at 0:34

Thank you very much

ahmad assahab on 4 Dec 2019 at 9:02

how about coding an affine cipher that hides text to image files?

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