I'm guiding a student project to handle texture smoothing, hence I need an alternative to PCG solver which is as existing solver... If you have Matlab code available, could you share it with me?
There are two softwares which may help you
ATOM and JTEX
http://www.jtex-software.eu/
http://www.atom-software.eu/
Try using a multi-grid method, if certain frequency of the solution space is easier to solved at lower resolution, that made a big speed up (in the order of 10-1000) for me when I needed to solve an elliptical partial differential equation.
Here is a wiki link: https://en.wikipedia.org/wiki/Multigrid_method
The good thing about using a multi-grid method is that you could just take an existing iterative solver, and write a loop through different resolution scale.
Best,
Thomas
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