Can Matlab enclose curves near the image boundaries and count the pixel intensities within?

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asdf 2019-3-7

编辑： asdf 2019-3-7

Let's say I have an example curve near the image boundaries:

I was hoping there was Matlab command that should force the ends of that curve to hit the boundaries of the image, similar to like this

and then calculate the sum of the pixel intensities in the blue region here:

Is this possible in Matlab?

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