extract part of medical image

Hi everyone Consider a garyscale image like http://speedy.sh/gzKnd/MSVideo-20121122-210148.JPG. What i trying to do is to find detect red lower boundaries like http://speedy.sh/8fTVJ/MSVideo-20121122-210148.jpg that I specifed with hand.Can anyone give me any hint on how this can be achieved?
thanks in advance

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Asked:

on 28 Oct 2013

Closed:

on 20 Aug 2021

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