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How to replace a bit plane in an image with a bit plane of another image?

Asked by Abhinaba Das

Abhinaba Das (view profile)

on 29 Mar 2013

Hello, To implement digital watermarking I want to replace 3 LSB bitplanes of asset image with 3 MSB bitplanes of message image but I doubt whether my code is correct. Below is the code I have written.

asset = imread('C:\asset.jpg'); 
orig = imresize(asset,[480 640]); 
BI0 = bitget(orig,1)*(2^0);
BI1 = bitget(orig,2)*(2^1);
BI2 = bitget(orig,3)*(2^2);
BI3 = bitget(orig,4)*(2^3);
BI4 = bitget(orig,5)*(2^4);
BI5 = bitget(orig,6)*(2^5);
BI6 = bitget(orig,7)*(2^6);
BI7 = bitget(orig,8)*(2^7);
msg = imresize(wm,[480 640]);
BW0 = bitget(msg,1)*(2^0);
BW1 = bitget(msg,2)*(2^1);
BW2 = bitget(msg,3)*(2^2);
BW3 = bitget(msg,4)*(2^3);
BW4 = bitget(msg,5)*(2^4);
BW5 = bitget(msg,6)*(2^5);
BW6 = bitget(msg,7)*(2^6);
BW7 = bitget(msg,8)*(2^7);

When I am using the command imshow(watermark) the effect of message picture is very much pronounced it's not getting hidden in the asset image. Please help me. Thanks in advance.


Abhinaba Das

Abhinaba Das (view profile)


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1 Answer

Answer by Walter Roberson

Walter Roberson (view profile)

on 29 Mar 2013

Don't forget to uint8() the watermarked result


Walter Roberson

Walter Roberson (view profile)

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