contour coordinate??

[Heba]

 how to get contour coordinate  not the rectangle coordinate

as i have found it->second->contour.startingPoint.x which get only 1 corner 

and i want the 4 corners 

,can any one help me??

[Cristóbal]

Hi,

When the blobs are extracted the contours are stored in chain codes format. So, firstly you must use "cvConvertChainCodesToPolygon" to convert to a list of vertex. The problem is this polygon will be a lot of vertex so you will need to simplify, for example:

      CvContourPolygon *polygon = cvConvertChainCodesToPolygon(it->second->contour);

      CvContourPolygon *sPolygon = cvSimplifyPolygon(polygon, 5.);

Then, you can iterate trough the vertex:

CvContourPolygon::const_iterator it=sPolygon->begin();

if (it!=contour->end())

{

x = it->x;

y = it->y;         // ...

}

I hope the code is almost right ;)

Best,

Cristóbal