How to remove an unwanted extension of a threshold?

This is the thresholded image in context. The part that is unwanted is the extension on the top, I hope it's deducible. If it isn't, please ask. I want the almost circular part that would remain after removing the extension in context. How do I go about doing it? I've had someone suggest morphologial operation would help. Could someone please expand on that, and maybe provide an example?

Thanks

Here's another example:

1 Answers

Answers 1

The best practice would be, since you only need shapes similar to circle. Try using curve fitting along with Kalman Filter. Hope this would definitely tackle the problem in a more efficient way. circle equation will try to pull(correct) the points towards the center and Kalman will help trace the curve effectively.

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