MATLAB: Error-Cannot support cell array

image processing

I have a code for dual tree and reducing the co-efficients but i get error,please help 
error is 
Error using ==> cell2mat at 55
Cannot support cell arrays containing cell arrays or objects.
Error in ==> final at 9
  w=cell2mat(w)
x=imread('st.tif');
x1=rgb2gray(x)
x=double(x1)
 J = 3;
 [Faf, Fsf] = FSfarras;
 [af, sf] = dualfilt1;
 w = dualtree2D(x, J, Faf, af)
  threshold=0.624525
w=cell2mat(w)
NewData = w;
idx = w >= threshold;
NewData(idx) = threshold - eps(threshold);
size(I);
size(NewData);

Best Answer

That's because your cell array output, w, contains cell arrays within it.

Go back to your dualtree2D source code, and read the paragraph that begins,

The wavelet coefficients w are stored as a cell array.

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That is because w is a cell array of cell arrays.

For example:

      x = rand(16);
      J = 1;
      [Faf, Fsf] = FSfarras;
      [af, sf] = dualfilt1;
      w = dualtree2D(x, J, Faf, af);

w{2}{1} gives you the approximation image at level 1, so you can do:

      App = w{2}{1};
The above is matrix

To get the dual tree detail coefficients (H,V,D),enter:

       Atreedetcoefs = w{1}{1};
       Btreedetcoefs = w{1}{2};

The above are cell arrays of matrices, you can use cell2mat on Atreedetcoefs and Btreedetcoefs, but you have to be careful that you know how the H,V, and D matrices are concatenated.

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w2 = word(cellfun(@ischar,word));
out_str1 = strjoin(w2(~ismember(w2,stopwords_cellstring)),' ');

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