Error in Image Embedding....

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amitesh kumar
amitesh kumar 2011-3-6
Hello i am trying to run following code...
i=imread('lena.tif');
s=double(i);
j=imread('watermark.bmp');
w=double(j);
[m,n]=size(s);
[g,h]=size(w);
x=dec2bin(s,8); % decimal to binary transformation
y=double(x);
y=y-48;
plane=cell(1,8);
for r=1:8
plane{r}=y(:,r);
end
for r=1:8
planes{r}=reshape(plane{r},m,n);
end
but i am getting error as follows: ??? Operands to the and && operators must be convertible to logical scalar values.
Error in ==> dec2bin at 31 if any(d < 0) any(~isfinite(d))
Error in ==> Un2 at 13 x=dec2bin(s,8); % decimal to binary transformation
my image size is 512*512 ans watermark size is 64*64.. any one would like to suggest me how can i debug it...thnax and regards....
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amitesh kumar
amitesh kumar 2011-3-6
sorry sir..from now onwards i'll keep this in mind. one thing i would like to say that ur previous answer regarding log-polar help me a lot regarding getting idea about it. thanx a lot....

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采纳的回答

Walter Roberson
Walter Roberson 2011-3-6
dec2bin() is not documented as accepting anything other than a scalar.
In practice, dec2bin() accepts a vector, but it does not accept an array of 2 or more dimensions. Thus:
dec2bin(s(:),8)

更多回答（2 个）

amitesh kumar
amitesh kumar 2011-3-6
Thnx sir for ur answer.
w(m,n)=0;
planes{8}=ones(m,n);
planes{8}= and(planes{8},w); % Adding the WaterMark
for r=1:8
frames(:,:,1,r)=planes{r};
end
iy=zeros(m*n,8);
for r=1:8
iplanes{r}=reshape(planes{r},(m*n),1);
iy(:,r)=iplanes{r}(:,1);
end
if i am trying to execute further after modifying as u previouly suggested me ,it's showing another error as
??? Attempt to grow array along ambiguous dimension.
Error in ==> Un2 at 24
w(m,n)=0;
here i tried also by changing the w(m,n)as w(g,h) but in this case it is showing error as
??? Error using ==> and
Inputs must have the same size.
Error in ==> Un2 at 26
planes{8}= and(planes{8},w); % Adding the WaterMark
so sir i would again expect ur suggestion regarding this error
thanx and regards....
  1 个评论
Walter Roberson
Walter Roberson 2011-3-6
Using w(m,n) = 0 could result in "Attempt to grow array along ambiguous dimension" if w (your watermark image) was 3 dimensional, such as would be the case if it is an RGB image. You need to test for that case and figure out what you want to do if it happens.

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amitesh kumar
amitesh kumar 2011-3-7
thnku so much Walter...got executed prog successfully...i am getting original image, watermark image in perfect manner ..but the final image as figure 3 is not coming as embedded one. as it coming in improper manner. showing some blur effect.this is the further code which i am using in continuation with above mentioned code...everything working fine just i am getting embedded image not in a proper way.
iy1=zeros(1,m*n);
for L=1:m*n
for r=1:8
iy1(L)=iy1(L)+iy(L,9-r)*(2^(r-1));
end
end
s_plus_w=reshape(iy1,m,n);
s_plus_w=uint8(s_plus_w);
imwrite(s_plus_w,'img.tif');
imshow('img.tif');
figure,imshow(j)
figure,montage(frames)
and again thnku so much for giving me ur precious time to sort out my doubts.
  2 个评论
Walter Roberson
Walter Roberson 2011-3-7
I'll need to see the full corrected code, not just the additional steps.
amitesh kumar
amitesh kumar 2011-3-7
Here i am giving the full corrected code...
i=imread('lena.tif');
s=double(i);
j=imread('watermark.bmp');
w1 = rgb2gray(j);
w=double(w1);
[m,n]=size(s);
[g,h]=size(w);
x=dec2bin(s(:),8); % decimal to binary transformation
y=double(x);
y=y-48;
plane=cell(1,8);
for r=1:8
plane{r}=y(:,r);
end
for r=1:8
planes{r}=reshape(plane{r},m,n);
end
w(m,n)=0;
planes{8}=ones(m,n);
planes{8}= and(planes{8},w); % Adding the WaterMark
for r=1:8
frames(:,:,1,r)=planes{r};
end
iy=zeros(m*n,8);
for r=1:8
iplanes{r}=reshape(planes{r},(m*n),1);
iy(:,r)=iplanes{r}(:,1);
end
iy1=zeros(1,m*n);
for L=1:m*n
for r=1:8
iy1(L)=iy1(L)+iy(L,9-r)*(2^(r-1));
end
end
s_plus_w=reshape(iy1,m,n);
s_plus_w=uint8(s_plus_w);
imwrite(s_plus_w,'img.tif');
imshow('img.tif');
figure,imshow(j)
figure,montage(frames)

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