MATLAB CODING - PART IV

The information hiding homepage Digital watermarking & steganography

Matlab code

Hare = imread('arctic_hare.bmp', 'bmp');
F15 = imread('F15.bmp', 'bmp');
n = 4; % Number of bits to replace 1 <= n <= 7

[Stego, Extracted] = LSBHide(Hare, F15, n);

figure, imshow(Stego)
figure, imshow(Extracted)

where

function [Stego, Extracted] = LSBHide(Cover, Hidden, n)
%LSBHide
% [Stego, Extracted] = LSBHide(Cover, Hidden, n)
% Hide Hidden in the n least significant bits of Cover

Stego = uint8(bitor(bitand(Cover, bitcmp(2^n - 1, 8)) , bitshift(Hidden, n - 8)));
Extracted = uint8(bitand(255, bitshift(Stego, 8 - n)));