How return my image from binary to grayscale

Question

hudof najeeb 2016-12-29

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/318499-how-return-my-image-from-binary-to-grayscale

评论： snehal gaikwad 2020-10-3

I hide my image "mouse" in image " pigs". Firstly I convert the image "mouse" to binary in encryption code .secondly I return it from decryption code .Now I want to return it to gray-scale. how can help please.

encryption code

main = imread('mouse.tif');
cover = imread('pigs.tif');
main2= im2bw(main);
bitNo = 1;
steg = zeros(size(cover), 'uint8');
for i = 1:size(cover,1)
    for j = 1:size(cover,2)
       coverTmp  = dec2bin(cover(i,j), 8); 
       msgTmp   = dec2bin(main2(i,j)); 
       coverTmp(9-bitNo) = msgTmp;
       steg(i,j) = bin2dec(coverTmp);
    end
end
imwrite(steg,'S1.tif');

decryption code

stego = imread('S1.tif');
steg1 = zeros(size(stego));
for i = 1:size(stego,1)
    for j = 1:size(stego,2)
       mTmp  = dec2bin(stego(i,j), 8); 
       msTmp = mTmp(9-bitNo);
       steg1(i,j) = bin2dec (msTmp);
    end
end  
grayImage = 255*uint8(steg1);
figure, imshow(grayImage);

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Image Analyst 2016-12-29

LSB_Watermarking.m

You forgot to attach s1.tif, mouse.tif, and pigs.tif. If you want an bitplane watermarking demo, see my attached demo.

hudof najeeb 2016-12-30

thank you it is very useful.

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Answer 1

John D'Errico 2016-12-29

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/318499-how-return-my-image-from-binary-to-grayscale#answer_248868

编辑：John D'Errico 2016-12-29

If your image is at the end in binary form, so 0-1 only, then nothing can convert it back into a full grayscale, with additional information per pixel. You have thrown that information away. That information is lost forever. If you wanted to retain more information, then you needed to do a better job of storing the additional information before you lost it.

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snehal gaikwad 2020-10-3

if we have rescaled the binary image which gives area of interest from grayscale image then how we can convert binary image back to that input garyscaled image of same size (size of resized binary image)

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