How do I individually calculate the area of each enclosed space within a binary image?

I have a binary image with multiple enclosed, assumed to be circular, areas and would like to calculate the enclosed areas individually with goal of finding the average enclosed diameter. Taking a cumulative area and solving for diameter is not ideal since this slightly skews the measurements. Is there a way to find and store all of the individual enclosed areas as a vector? Thanks in advance

Answer 1

[Image Analyst]

Attach your image. I need to know what is foreground and what is background. If it's all white with some black spots, then you can invert and use regionprops. If you have a black background with white spots with enclosed black holes in them, it becomes more tricky.