Applying MATLAB's idwt2 several times

Question

I am using MATLAB to apply the Discrete Wavelet Transform on an image. I am applying it several times (3) in order to get a 3 level transform. I am using the dwt2 function provided by MATLAB in order to compress and idwt2 to make the decompression. The problem is that I do not know how to decompress several times, as in apply idwt2 several times to the previous received output, as it returns a matrix. Take for example:

x = idwt2(scaled3, vertical3, horizontal3, diagonal3, Lo_R, Ho_R);

How should idwt2 be applied to x?

Answer 1

You may also wish to look at this simiplified utility: http://www.mathworks.com/matlabcentral/fileexchange/29049-wavelet-decomposition-for-images