I am trying to implement DWT on gray images in C++. I saw an OpenCV implementation at https://stackoverflow.com/a/20072775/3024435.
The article at http://www.whydomath.org/node/wavlets/hwt.html was useful in understanding and implementing low/high pass filter using Haar wavelets.
Can somebody show how to convert the same to use db3 or db4???
Thanks in advance