Emgu CV - Skeleton of an Image in EmguCV (Skeletonization)

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C#

video

Emgu-CV

image-processing

Hi, i need to implement Skeletonization in Emgu CV but i not have success.
I have a code mentioned on the website below but it does not work :
http://stackoverflow.com/questions/24226871/skeletonization-using-emgucv[^]

This code below DONT work:

Image<Gray, Byte> eroded = new Image<Gray, byte>(img2.Size);
       Image<Gray, Byte> temp = new Image<Gray, byte>(img2.Size);
       Image<Gray, Byte> skel = new Image<Gray, byte>(img2.Size);
       skel.SetValue(0);
       CvInvoke.cvThreshold(img2, img2, 127, 256, 0);
       StructuringElementEx element = new StructuringElementEx(3, 3, 1, 1, Emgu.CV.CvEnum.CV_ELEMENT_SHAPE.CV_SHAPE_CROSS);
       bool done = false;

       while (!done)
       {
           CvInvoke.cvErode(img2, eroded, element,1);
           CvInvoke.cvDilate(eroded, temp, element,1);
           temp = img2.Sub(temp);
           skel = skel | temp;
           img2 = eroded;
           if (CvInvoke.cvCountNonZero(img2) == 0) done = true;
       }

This code WORK but is very slow in video (sequential frames)

Image<Gray, byte> Skeleton(Image<Gray, byte> orgImg)
        {
            Image<Gray, byte> skel = new Image<Gray, byte>(orgImg.Size);
            for (int y = 0; y < skel.Height; y++)
                for (int x = 0; x < skel.Width; x++)
                    skel.Data[y, x, 0] = 0;

            imageBoxOutputROI.Image = skel;

            Image<Gray, byte> img = skel.Copy();
            for (int y = 0; y < skel.Height; y++)
                for (int x = 0; x < skel.Width; x++)
                    img.Data[y, x, 0] = orgImg.Data[y, x, 0];

            StructuringElementEx element;
            element = new StructuringElementEx(3, 3, 1, 1, Emgu.CV.CvEnum.CV_ELEMENT_SHAPE.CV_SHAPE_CROSS);
            Image<Gray, byte> temp;

            bool done = false;
            do
            {
                temp = img.MorphologyEx(element, Emgu.CV.CvEnum.CV_MORPH_OP.CV_MOP_OPEN, 1);
                temp = temp.Not();
                temp = temp.And(img);
                skel = skel.Or(temp);
                img = img.Erode(1);
                double[] min, max;
                Point[] pmin, pmax;
                img.MinMax(out min, out max, out pmin, out pmax);
                done = (max[0] == 0);
            } while (!done);

            return skel;
        }

This is a image of result of skeletonization:
https://dl.dropboxusercontent.com/u/80529956/EmguCV/skeleton.png[^]


I need a help to implement the skeletonization code.

A research in below sites but i not hace success:
http://felix.abecassis.me/2011/09/opencv-morphological-skeleton/[^]

http://stackoverflow.com/questions/26850944/skeleton-of-an-image-in-emgucv[^]

http://stackoverflow.com/questions/26850944/skeleton-of-an-image-in-emgucv[^]


I am grateful for any help .


Richard J. Algarve