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:

3 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.

Answers 2

Your image is like a piece of flat plane3D view of your image . OTSU is not always a good idea. Disable it and choose a manual threshold (75).

Answers 3

from scipy import misc from skimage.morphology import erosion     data = misc.imread('gycl1.jpg') eroded = erosion(data, disk(25) 

Is this what you meant? I am using the erosion morphological operator with a disk size (to maintain the circular function).

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