Generating a wavelet dictionary for sparse representation of images

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Muzammil Behzad 2016-5-5

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https://ww2.mathworks.cn/matlabcentral/answers/282640-generating-a-wavelet-dictionary-for-sparse-representation-of-images

Hello,

I am trying to represent the patches of an image in terms of the wavelet basis/columns of a dictionary/sensing matrix using the relation y = Ax where y is a patch, A is the dictionary and x is the sparse vector. How do I generate this dictionary in MATLAB containing only wavelet basis. The size of the patch 'y' in vector form is lets say 25x1. Please help.

Thanks in advance.