I am trying to implement LSB watermarking in matlab.But i am getting the error=> Assignment has more non-singleton rhs dimensions than non-singleton subscripts Error in ==> watermarked_image(ii,jj)=bitset(watermarked_image,1,watermark(ii,jj));

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Urmila 2013-10-4

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https://ww2.mathworks.cn/matlabcentral/answers/89156-i-am-trying-to-implement-lsb-watermarking-in-matlab-but-i-am-getting-the-error-assignment-has-more

评论： Image Analyst 2013-10-7

here is the code=>

clc file1='C:\Users\Public\Pictures\Sample Pictures\Chrysanthemum.jpg'; [cover_image,map]=imread(file1); %imshow(cover_image,map);

file2='C:\Users\Public\Pictures\Sample Pictures\Hydrangeas.jpg'; [message_image]=imread(file2); %imshow(message_image);

message_image=double(message_image); message_image=round(message_image./256); message_image=uint8(message_image);

O=size(cover_image,1) P=size(cover_image,2)

Q=size(message_image,1) R=size(message_image,2)

for ii = 1:O for jj = 1:P watermark(ii,jj)=message_image(mod(ii,Q)+1,mod(jj,R)+1); end end watermark=double(watermark) watermark=round(watermark./256); watermarked_image=cover_image; for ii =1:O for ii= 1:P watermarked_image(ii,jj)=bitset(watermarked_image,1,watermark(ii,jj)); end end

imshow(watermarked_image)

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Urmila 2013-10-5

Can anybody help me please..

Image Analyst 2013-10-5

Like this? http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

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Answer 1

Image Analyst 2013-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/89156-i-am-trying-to-implement-lsb-watermarking-in-matlab-but-i-am-getting-the-error-assignment-has-more#answer_98712

Chances are you have 3D true color images. So you need to specify a color channel, as in watermark(row, column, colorChannel), not just the row and column, as in watermark(row, column).

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Urmila 2013-10-6

在 MATLAB Online 中打开

Hello sir, according to your solution i tried to modify the code but still getting the same error. so can you tell me whether i have done changes correctly or not.Here is modified code=>

clc
file1='C:\Users\Public\Pictures\Sample Pictures\Chrysanthemum.jpg';
[cover_image,map]=imread(file1)
imshow(cover_image,map); 
file2='C:\Users\Public\Pictures\Sample Pictures\Hydrangeas.jpg';
[message_image]=imread(file2);
imshow(message_image);
 message_image=double(message_image);
 message_image=round(message_image./256);
 message_image=uint8(message_image);    
 O=size(cover_image,1)
 P=size(cover_image,2)
 S=size(cover_image,3)
   Q=size(message_image,1)
   R=size(message_image,2)
   T=size(message_image,3)
   for ii = 1:O
      for jj = 1:P
          for kk=1:S
          watermark(ii,jj,kk)=message_image(mod(ii,Q)+1,mod(jj,R)+1,mod(kk,T)+1);
      end
      end
   end
   watermark=double(watermark);
   watermark=round(watermark./256);
   watermarked_image=cover_image;
   for ii =1:O  
       for jj=1:P 
           for kk=1:S
             watermarked_image(ii,jj,kk)=bitset(watermarked_image,1,watermark(ii,jj,kk));
           end
        end
   end
imshow(watermarked_image)