[Python] Extracting polygon given coordinates from an image using OpenCV

I've a set of points like the following:

<dataolygon>
<dataoint x="542" y="107"/>
<dataoint x="562" y="102"/>
<dataoint x="582" y="110"/>
<dataoint x="598" y="142"/>
<dataoint x="600" y="192"/>
<dataoint x="601" y="225"/>
<dataoint x="592" y="261"/>
<dataoint x="572" y="263"/>
<dataoint x="551" y="245"/>
<dataoint x="526" y="220"/>
<dataoint x="520" y="188"/>
<dataoint x="518" y="152"/>
<dataoint x="525" y="127"/>
<dataoint x="542" y="107"/
</dataolygon>


I want to draw the polygon defined by these points in the image and then extract it. How can I do that using OpenCV with python ?

Continue reading...