Finding Circles In Scatter

I am working with a sensor and I have collected data which represented in two lists: filtered_x = [64, 90, 83, 78, 57, 58....] filtered_y = [26, 17, 63, 21, 62, 86....] Which give

Solution 1:

Use kernel density estimation (KDE), and find maxima.

Because that is what you want to find, the most dense locations.