How to use ginput for image segmentation?

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Veronika
Veronika 2016-9-7
编辑： Veronika 2016-9-7
Dear all,
I tried ginput for image segmentation, but I obviously don´t know how to use it. My result is only figure with axes and curve. I attach printscreen of my result and the result of how it should look like. This is my code:
clc;close all;clear all;
figure
imshow('thorax-mdl.jpg')
[x,y] = ginput;
plot(x,y)
My result:
Required result:
Thank you for your answers.

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