You could dilate the image repeatedly until the boundary closed (at which point there would be only one blob) and then erode it again maintaining continuity; see bwmorph() for useful functions.
How to get a region from points
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Below is a scatter plot from array that I get using boundary(). How can I get a region so that I can use regionprops() to find the centroid, orientation etc.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/150648/image.png)
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