I want to implement watermarking algorithm based on Intermediate Significant Bit replacement

Hi everyone

I want to implement watermarking algorithm based on Intermediate Significant Bit replacement, it's for a project.

How to create ranges for each bitplane ?

Answer 1

[Rahul]

Hi @Maheritiana Francky Ratsimbazafy,

I understand that you wish to implement watermarking algorithm based on Intermediate Significant Bit replacement.

Here are some steps you can follow:

• Use the 'bitget' function to extract the 'kth' bit plan from the image.
• You can choose which bit plane to change to add the watermark.
• The watermark can be of random values within certain limits, can be adjusted according to requirements.
• The 'bitset' function can be used to add the watermark values in the desired bit plane.

Here is an example:

img = imread('cameraman.png');  
img = uint8(img);              

% Extract each bitplane
bitplanes = zeros([size(img), 8], 'logical');

for k = 1:8
    bitplanes(:,:,k) = bitget(img, k);  % Extract k-th bitplane
end

% Replacing bitplane 4 with a watermark
watermark = randi([0 1], size(img));  % Example binary watermark
watermarked_img = bitset(img, 4, watermark);  % Embed in bitplane 4

imshow(watermarked_img),

The following MathWorks documentations can be referred:

'bitget': https://www.mathworks.com/help/matlab/ref/bitget.html

'bitset': https://www.mathworks.com/help/matlab/ref/bitset.html

Thanks.