Hide Picture inside Image

1- Hide a binary picture in a RGB picture so that 7 bits given for the actual picture and the 8th bit will carry the data of the binary image, for the later, you can take a random screenshot for a text and convert it to binary using matlab.

2- In matlab code make a string variable and put in it any sentence "message", then encode this string to binary and put it in the 8th bit of the RGB picture data bits, just like the first binary image.

3- Extract the binary image back from the first requirement, and the text message from the second.

[Yongjian Feng]

Try it yourself first please. We can then help to make it work.

[Ramiz Siam]

This code works to hide text in an image. I need to hide a picture in a picture

[DGM]

What's the difference between cramming a binary vector into the LSB plane and doing the same with a binary matrix?

The answer is that the only difference is a matter of indexing because one is a vector and one is a matrix.

Answer 1

[DGM]

For example:

% host image
A = imread('cameraman.tif');
sa = size(A);

% payload image
B = imread('hands1-mask.png');
B = imcrop(B,[1 1 min(size(B))-[1 1]]); % crop or resize as needed
B = char(B + char('0')); 
sb = size(B);

% cram B into A
Ab = reshape(permute(dec2bin(A),[1 3 2]),[sa 8]);
Ab(1:sb(1),1:sb(2),8) = B; % insert into LSB plane
Ab = uint8(reshape(bin2dec(reshape(Ab,prod(sa),8,1)),sa));

imshow(Ab)

Note that A is larger than B

Recovering the image should be mostly just a matter of copying and pasting parts of the above code.