how to draw inner boundaries of centroids?

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Aditya Misra
Aditya Misra 2020-7-28
编辑： Abhishek Gupta 2020-9-7
I generated centroids from my images, and made a 2D scatter plot of them. I'd like to draw the inner boundaries using functions, but I don't know where to begin. Right now, I'm drawing the boundaries using the drawpolygon. I draw the outer boundary using convhull(). I attached an example image of what i'm looking for and the centroids data for that image. Even if something is close enough, that's totally fine. I'd like some advice how to begin.
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Aditya Misra
Aditya Misra 2020-7-28
I was under the impresion that the boundary() function would give me the outer boundary, but not the inner one.

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Abhishek Gupta
Abhishek Gupta 2020-9-7
编辑：Abhishek Gupta 2020-9-7
Referring to the following link, which might help you in resolving the issue: -
https://www.mathworks.com/matlabcentral/answers/401319-expand-to-find-inner-boundary-of-object

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