I am trying to detect each ball, count how many there are, and get their location. I am currently using Canny Edge Detection for that which works pretty well if the balls don't touch each other:

The problem I have is that if the balls are touching, it is not possible to differentiate between them anymore and they are treated as one object:

I tried to use HoughCircles, but found that this only works well with actual circles, not distorted ones.

So how would I go about finding a solution? Is there any algorithm that fits better for this problem, or can I somehow work out the individual circles in each contour?

CodePudding user response：

What you could try is to filter the frame on red and green, so you get the contours of your balls. Then use a watershed algorithm to separate the contours.

Watershed example: https://docs.opencv.org/4.x/d2/dbd/tutorial_distance_transform.html