(Semi) Automatic ROI selection

Hi,

I have a repeating pattern on my image (some contours) that I would like to individually analyze as seem in the example image. So far I selected the ROIs manually using the polygon area selection feature as there were not many repeating shapes. I was wondering if you have any suggestions on how to make the ROI selection automatic or semi-automatic? I am interested in extracting the coordinates of each ROI for further analysis.

Thanks in advance for the help.

Example.tif (1.4 MB)