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Anisotropic diffusion

Hello great openCV-community,

I'd like to find out if it is possible to perform an anisotropic diffusion operation on an image through openCV? I found out that the KAZE and AKAZE feature detectors use the anisotropic diffusion. But I think the functions behind are private and inaccessible. Is there a filter predefined for this filteringoperation or do I have to write my own filter? (or make usage of the filter which "occurs" for this purposes in this forum ? isotropic non-linear diffusion...

Thank you very much in advance, Best Regards