How to delete small objects using bwareaopen?

Question

I have an image and I want to remove the black pixels that are on large white objects. I use the function bwareaopen(BW,P), but only removes hole objects, not black pixels. I tried different values P, but failed again.

Why bwareopencan't remove black pixels on white objects and how to remove them?

Picture:

Answer 1

bwareaopen()removes white areas smaller in size p. If you want to remove black holes inside your white areas, you must use the function imfill().

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