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I am applying dtw2 to an image (512*512)and after level 1 decomposition, I am getting approximation(256*256) and other details. How can I scale up only the 256*256 approximation to 512*512 size?

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shimul
shimul le 16 Août 2013
I am applying a discrete wavelet transformation on an image(suppose of size512*512) . Then I am getting 4 subband images after level 1 decomposition(approximation, horizontal,vertical and diagonal details) each of size 256*256.
now I want this approximation details scaled up in the size of 512*512.

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