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How can i extract the hidden message from 1st, 2nd and 3rd bit plane of cover image and store in another text file?

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Sanjeeb Behera 2016-9-18

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https://ww2.mathworks.cn/matlabcentral/answers/303521-how-can-i-extract-the-hidden-message-from-1st-2nd-and-3rd-bit-plane-of-cover-image-and-store-in-ano

回答： Image Analyst 2016-9-20

在 MATLAB Online 中打开

fp = fopen('C:\Users\hello\Documents\MATLAB\Full RSA Implement\plaintext.txt','r+'); 
SecretMsg=fread(fp,256*256*3/8);
fclose(fp);
SM=de2bi(SecretMsg);
SM1=reshape(SM,256*3,length(SM)*8/(256*3));
HS = logical(SM1);
I1 = HS(1:256,1:256);
I2 = HS(257:512,1:256);
I3 = HS(513:768,1:256);
II = logical(I8)*128+logical(I7)*64+logical(I6)*32+logical(I5)*16+logical(I4)*8+logical(I3)*4+logical(I2)*2+logical(I1);

Here i have done to hide a file inside the bit plane of cover image. Then i don't know hoe to retrieve same hidden file in another text file.

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Geoff Hayes 2016-9-20

Sanjeeb - where have you defined I4 through I8? To decode, wouldn't you just reverse the assignment for II?

Sanjeeb Behera 2016-9-20

I can't understand. Can you explain me please

Sanjeeb

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Image Analyst 2016-9-20

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hide_text_in_image.m

See attached demo.

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