How to use Canny edge detector for polymeric (polyurethane) foams?

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Erik Cuevas

In my opinion, it is important first to apply an pre-processing technique before using Canny. Sometihing like a contrast operation in order to highlight the circle borders

Cosimo Brondi

Dear Mr. Cuevas, thanks for replying to my question. Could you, please, if there is, indicate any reference in the literature describing wich operation and/or parameters can be used in order to perform a pre-processing contrast operation for this kind of circle borders?

Thanks in advance.