Opencv which method is better to find contours?

Question

Algorithms

Tell me if anyone has the source code so that you can very accurately recognize the contours, as in this article https://habrahabr.ru/post/128803/ or maybe someone has better algorithms?
Specifically, it is necessary to recognize metal particles, but standard algorithms do not turn out as we would like, and in the article on Habré, contours are very accurately recognized in the examples. Here is the image where you need to recognize and draw the contours

Answer 1

Specifically, in the provided article from Habr, an algorithm was used that could be called Precise Edge Detection using CNBF .
Edge detection and Cellular Neural Boolean Filtering
Figure 6 . Precise edge detection using CNBF with ...
Image Processing Using Cellular Neural Networks Ba...
One of the authors of this method is Igor Aizenberg (Russia-Israel-USA)