How to link broken edges of ellipsoid figures in an image?

Hello everyone,

I have been reading a great number of Q&A regarding this topic (linking edges), but am still troubled with the following problem. I have a B&W image consisting of particles that may be described as ellipses/circles more or less accurately. Most of them contain holes, which I have filled with the imfill command. Yet, due to difficulties in the image processing part of the code, some of the edge pixels are lost no matter what I do... Then, instead of having filled particles I end up with very irregular shapes.

I have also plotted the equivalent ellipses that I can get from the regionprops command.

Do you know any techniques that would allow me to "rebuild" those ellipses?

Thank you a lot in advance.

Answer 1

[Image Analyst]

You can create binary images from imellipse() or poly2mask().

[Juan Martin Maffi]

Dear Image Analyst,

Thank you for your reply. I'm affraid that creating binary images will not help me in this case, since I do not know the centroids nor the axes. The red ones that I have plotted in the 2nd figure are the result of the regionprops command. You may see that those particles that have their edges broken give ellipses that do not match the shape of the particle (some are off by quite a lot).

The goal would be to approximately redraw the pixels that are missing from the particle edges.

Thank you once again

[Image Analyst]

Then you're just going to have to improve the segmentation. The software doesn't know if some irregularly shaped blob is supposed to be an ellipse or just some arbitrarily shaped blob. If it's segmenting it wrong, then you're going to first have to fix that.

[Juan Martin Maffi]

Okay, thank you!