detecting curves in a binary image

Hello, I have traced boundary of the image using bwboundaries(). I want to detect the infra-mammary curve and remove the part of the image below the curve. can someone help me do this?

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Want to keep the curves only, rest should be removed?
Carify with pointing arrow,(use paint)?
boundary detected img1.bmp
the two curves are shown in red. i want to detect the line shown in yellow so that i can segment the part below the yellow line. Thank you for replying.

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Asked:

on 6 Jul 2019

Commented:

on 9 Jul 2019

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