How to calculate area of an irregular shape region in a binary image?

Is there any way to calculate the area of the irregular regions in a binary image? I am attaching the image here.Kindly help me.

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Try this:

props = regionprops(binaryImage, 'Area');
allAreas = [props.Area]

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How to calculate area of an irregular shape region in a binary image?

How to calculate area of an irregular shape region in a binary image?