how to separate objects in binary image?

Hello,

I have binary images representing ROIs as the one attached. In this example is is clearly seen that there are 3 ROIs, 3 closed polygons. I want to separate those ROIs in order to assign a label to each one.

I've tried using bwlabel but the problem is that ROI1 and ROI3 have some connected pixels, so I can separate ROI2 but not ROI1 and ROI3.

Any recommendations of how to do this?

[Alexandra]

Have you found a solution? I have the same problem

Answer 1

[Nitin]

Your should check regionprops and morphological processing.

One simple way would be by computing the area of each region and selecting the region of interest.