How can I select multiple polygons on an image?

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v10as
v10as 2016 年 6 月 26 日
I am trying to calculate the area of certain regions in my image. I am currently using 'roipoly' and 'bwarea' to do this but this only allows me to select 1 closed polygon for the image and gives me the binary image based on one polygon.
How can I select multiple polygons and calculate the total area of all the polygons?

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