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error 'index exceeds matrix dimensions'

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SIBI SIVA
SIBI SIVA 2016-10-17
关闭： MATLAB Answer Bot 2021-8-20
figure
for i=1:11
y(:,:,k3)=idwt2(llf(:,:,i),lhf(:,:,i),hlf(:,:,i),hhf(:,:,i),'haar');
s=mat2gray(y(:,:,k3));
subplot(4,4,i)
imshow(s);
k3=k3+1;
end
figure
i1=1;
j1=1;
a1(i1:i1+63, j1:j1+63)=mat2gray(cell2mat(P(1)));
a1(i1:i1+63, 65:65+63)=mat2gray(cell2mat(P(2)));
a1(i1:i1+63, 129:129+63)=mat2gray(cell2mat(P(3)));
a1(i1:i1+63, 193:193+63)=mat2gray(cell2mat(P(4)));
a1(65:65+63, j1:j1+63)=mat2gray(cell2mat(P(5)));
a1(65:65+63, 65:65+63)=mat2gray(s(:,:,1));
a1(65:65+63, 129:129+63)=mat2gray(s(:,:,2));
a1(65:65+63, 193:193+63)=mat2gray(s(:,:,3));
a1(129:129+63, j1:j1+63)=mat2gray(s(:,:,4));
a1(129:129+63, 65:65+63)=mat2gray(s(:,:,5));
a1(129:129+63, 129:129+63)=mat2gray(s(:,:,6));
a1(129:129+63, 193:193+63)=mat2gray(s(:,:,7));
a1(193:193+63, j1:j1+63)=mat2gray(s(:,:,8));
a1(193:193+63, 65:65+63)=mat2gray(s(:,:,9));
a1(193:193+63, 129:129+63)=mat2gray(s(:,:,10));
a1(193:193+63, 193:193+63)=mat2gray(s(:,:,11));
imshow(a1);
i use this part of code to reassemble the watermarked blocks of an image. but it shows the error 'Index exceeds matrix dimensions.
Error in aftrR2 (line 185)
a1(65:65+63, 129:129+63)=mat2gray(s(:,:,2)); ' .
can anyone help me solve the error.thanks in advance.
  1 个评论
KSSV
KSSV 2016-10-17
Check the dimensions of every matrix you are using and see the loop's which you are using to call the matrices.

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回答（1 个）

Jan
Jan 2016-10-17
编辑：Jan 2016-10-17
The message means, that the variable "s" does not have the size 2 in the third dimension. Check this:
dbstop if error
Then runm your code again until Matlab stops at the error. Now check the size of the variables unsed in the failing line.
I guess the problem is here:
s = mat2gray(y(:,:,k3));
After the loop "s" is the last gray image, which is a 2D matrix. Then mat2gray(s(:,:,2)) accesses a not existing 3rd dimension and tries to convert it to gray levels again.

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