How Interact with ContourFinder(Contour detected -OfxOpencv),blobs VS Some kind of objects,like a simple circle or a system particle for instance?

In this case, and in my opinion, don't hesitate: ask for clarification to the person who answered to you. Because it is sometimes not obvious to choose the right details level of an answer.
Same thing for my previous reply: if you doesn't understand something, ask, I will clarify (if I can Image may be NSFW.
Clik here to view. ).