Denoising on the border of the output Alpha Mat

[unanan]

Hi all! I'm now using this repo to realize an automatic matting process. Now I'm confused about the noise appeared on the border of the Alpha Mat, which is the output Mat of the method: sm.solveAlpha(). To solve the problem, I think I need to design a particular denoising filter, but I don't know what kind of distribution the noise obeys. Now I push an issue to ask you, hope you can solve my question. Thank you in advance. :heart: