MATLAB: Data hiding Matlab

I gave the binary message as 01101001 format and input as 6*6 image. But getting error as index exceeds matrix dimensions in the below line. stegoI(i:i+2,j:j+2)=embed(I(i:i+2,j:j+2),message(indexm:indexm+1)); Can you please clarrify my doubt. Thank you

Best Answer

Please post the relevant part of the code. It is not possible to guess, if "embed" is a matrix or a function. E.g. "message" could be shorter than "imdexm+1" etc.

A recommended method to solve such problems is the debugger:

dbstop if error

Then MATLAB stops, if the error occurs and you can inspect the values of the variables to find the cause of the problem. This is more efficient than asking the forum.

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MATLAB: Error in Indexing & Matrix Dimension

As usual for this error message (or at least what I guess the error message is): The debugger help to find the problem:

dbstop if error

Then run the code again until it stops, when the problem occurs. Then inspect the dimensions of the locally used variables. Perhaps duplicatematrices has less than 95 elements, or the contents of duplicatematrices{i} has less than 2 columns, or availmat has less than 95 elements? Are you sure that t has the required number of ba{i}(jj) elements?

It is easier, when you try to find answers for these questions by your own.

What you will find out in less than a minute:

For i==11, j==2, t has 14 elements only, but ba{11}(2) is 15. Therefore t(1:ba{i}(jj)) cannot work.

I cannot suggest an improvement, because all I see is the not working code, while I cannot guess its intention. It is like "I have a+b=17, but I want another result" - impossible in theory to guess what the user needs.

MATLAB: 3D matrix index out of bounds problem

fIni = zeros(lx*ly, 9);
f = zeros(lx*ly,9);
walls = true(lx,ly);
walls(2:ly-1,2:lx-1) = false; 
   fwalls(walls,:)=fIni(walls,opposites);
    fwalls=reshape(fwalls,lx,ly,[]);

Best Answer

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MATLAB: Error in Indexing & Matrix Dimension

MATLAB: 3D matrix index out of bounds problem

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