i need a code for hiding a text in an image using lsb technique

hello, i need a code to hide a message in an image using lsb technique(Steganography).... im new user to use a matlab... i just only knew the basic command of matlab.... plzzzzzzzzz help

[sagar hepat]

 c = imread('any_image.jpg');
                  message = 'hi this is sagar from nagpur..'
                  message = strtrim(message);
                  m = length(message) * 8;
                  AsciiCode = uint8(message); 
                  binaryString = transpose(dec2bin(AsciiCode,8));
                  binaryString = binaryString(:);
                  N = length(binaryString);
                  b = zeros(N,1); %b is a vector of bits
                  for k = 1:N
                      if(binaryString(k) == '1')
                          b(k) = 1;
                      else
                          b(k) = 0;
                      end
                  end
                  s = c;
                  height = size(c,1);
                  width = size(c,2);
                  k = 1; Array=[];l=1;my=1;
                  for i = 1 : height
                      for j = 1 : width
                           LSB = mod(double(c(i,j)), 2);
                          if (k>m || LSB == b(k))
                              s(i,j) = c(i,j);
                              l=k+1;
                          else 
                              if(LSB == 1)
                                  s(i,j) = c(i,j) - 1;
                              else
                                  s(i,j) = c(i,j) + 1;
                          Array(my)=l;
                          l=l+1;
                          my= my + 1;
                          end
                          k = k + 1;
                          end
                      end
                  end
                   imwrite(s, 'hiddenmsgimage.bmp');

 k = 1;my=1;ur=1;
for i = 1 : height
  for j = 1 : width
    if( k<=m )
      if (my<numel(Array) && Array(my)==ur)
         b(k)=~(mod(double(s(i,j)),2));
      else
         b(k) = mod(double(s(i,j)),2);
      end
    k = k + 1;
    my= my + 1;
    end
  ur=ur+1;
  end
end

try this dude enjoy

[Jadem Molina]

hello, How can I get the hidden data on the Image. Thanks!

[M111111]

you can upload and decryp.Please

[vaishali sharma]

hello sir m beginner and m implementing lsb but i didnt get why we are using : for k = 1:N if(binaryString(k) == '1') b(k) = 1; else b(k) = 0; end end

[Akhil Ram Sai]

can you also comment the code for reconstruction of the text

[Walter Roberson]

Akhil Ram Sai, who are you addressing that to? sagar hepat is unlikely to see your request a year and half after they posted the question, and the volunteers who read this are likely to refer you to http://www.mathworks.com/matlabcentral/answers/?term=tag%3A%22steganography%22 as a number of other people have already commented their reconstruction code.

[hudof najeeb]

can you give me the decoded to return back the hidden text from the original and the encoded image ...please

[Image Analyst]

See my app: http://www.mathworks.com/matlabcentral/fileexchange/54155-encoding-text-into-image-gray-levels

[hudof najeeb]

sir,it was very interesting program but it used gray-level image .I want color image.how i can get it and if I want to get the hide text from cover image what i must do ?I mean the second part when I have original and cover image thx

[Walter Roberson]

Reshape your color image to rows by (columns * 3) and now the code cannot tell it was not just a wide gray image. Afterwards, reshape() it back.

[Image Analyst]

Or you can just extract one color channel, encode the text into it, then stick it back in.

[Amal]

i need a code for hiding a text in an image using lsb technique ?

[Image Analyst]

@Amal see attached

[Amal]

i need a code for hiding a text in an image using lsb technique in the GUI interface inside the button?

[Image Analyst]

What do you mean by the image is inside the button? How can you have an image inside the button? You mean a button with a little picture or icon on it? An image that could fit inside a button would most likely not have enough pixels in it to hide anything. Then there's the problem of getting the image out of the button. Why do you want/need to do this anyway?

[Amal]

How is text selected in the GUI interface in Matlab?

[Walter Roberson]

If you have a uicontrol style 'edit' (traditional figures), or if you have a uitext (uifigures) and those have text in them, then matlab does not provide any way itself to find out what text is selected.

The same is true for edit fields.

You can find out which cells of a table are selected, or which entries of a list box or drop box are selected, but not what text is selected within a field.

Answer 1

[Image Analyst]

Attached is one where I hide an image. You can adapt it to hide text if you want.

[Image Analyst]

Not sure. One way might be to just make an image out of the text by having each pixel of the image be the ASCII value of the text. I don't know if that's the most common way since steganography is not my field, but it should work .

[SHALU SINGH]

sir, why are you converting your image into binary image to hide a watermark into it.... is there is not any solution rather than this...?? because i done watermarking based on limitation watermark must be 1/8 of the host image. and if i insert the image into host based on this, then it only inserted into the left side on host image.... can you help??

[Image Analyst]

The cover image stays 8 bit while the watermark/hidden image is 1 bit (binary). That's just the way the person wanted it when I wrote the demo originally for him.

[SHALU SINGH]

but sir. there is very much of watermarked_image data loss.

[Image Analyst]

That demo does not hide a gray scale image in another gray scale image. It only uses the cameraman gray scale image to create the binary image. It is actually the binary image that I'm hiding, and there is no data loss for that. I just made this demo a long time ago following what one poster said he wanted to do. If you have a version that hides a grayscale image inside another grayscale image, please post it.

[SHALU SINGH]

sure sir..!! i will, presently i am working on this problem.. thanks a lot your demo help me in my work..