How to define points in an image using Region Growing?

Question

C++ / C#

Hello,
I have a cv::Mat where some areas (circles) have a value of 0. With the help of an ordinary iteration, I find 0, then look for neighbors with a value of zero, and so on, while writing the appropriate coordinates in a vector . Then I already find points on the border, like a border.
What ready-made functions of opencv or other libraries can help me speed up the process.
Thanks for the help.

Answer 1

You can immediately look for boundaries.
1. cv::Canny. Method for finding boundaries.
2. cv::findContours. finds the contours and saves them to a vector
And then, by analyzing the contours, you can remove the excess...

Answer 2

To find circles, you can use
https://www.pyimagesearch.com/2016/02/08/opencv-sh...
there is python, but in c++ the same api will be used.