Wavelet transform in openCV

Question

did someone tried to implement DWT in opencv or in C++? I saw older posts on this subject and i didn\'t find them useful for me, because I need a approximation coefficient a

Answer 1

Suggestion: I don't suggest you to implement dwt from scratch, it is very hard to meet your demands. If you really need it's cpp version in your job, I recommend you try PyWavelets, whose basic functions of dwt are implementd in C, so you can migrate it to your program easily. Otherwise, you can also verify your thoughts with python first rather than take a risk of paying useless efforts.

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Here is one of my implementation of dwt which support many kinds of wavelet filter, it works but dosen't work well. With the increasing of level, the reconstrusion being more and more blurred.

If you want to change the wavelet filter, you can use matlab (wfilters(wname)) or pick from PyWavelets's source code, and it also gives the rule to get totall 4 filter from these coefficients.