Is there any way to calculate a proportion of a certain area size to the entire area size in an image?

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EcoBase 2020-12-3

编辑： EcoBase 2020-12-3

I'm doing an image analysis and trying to calculate a ratio of a certain part to the whole in terms of their sizes.

A sample image as below:

I'd like to esimate how much the purple part at the center accounts for of the whole (whitish circular) area.

Is there any way I can do that in Matlab?

Thanks a lot in advance :)

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