Help about Image Segmentation with K-means

Thank you Ydaoust
I'm Vietnamese and my programming skill is fairly bad because my major's electronic. I also understood your opinion, but it's difficult for me to write code like your suggestion.So,I'm glad if you can give me a sample project about this problem.
Regards,

I am sorry, I don't use Accord.NET. All I could give you is pseudocode.

Are you able to perform the most basic operations such as getting or setting a pixel in the image at given X, Y coordinates ?

Hi, YDaoust
I did follow as your opinion, i wrote code as follows

for (int x = 1; x < image.Width-1; x++)
            {
                for (int y = 1; y < image.Height-1; y++)
                {
                    if (image.GetPixel(x, y) != image.GetPixel(x + 1, y))
                        image.SetPixel(x + 1, y, Color.Red);
                    if (image.GetPixel(x, y) != image.GetPixel(x - 1, y))
                        image.SetPixel(x - 1, y, Color.Red);
                    if (image.GetPixel(x, y) != image.GetPixel(x, y + 1))
                        image.SetPixel(x, y + 1, Color.Red);
                    if (image.GetPixel(x, y) != image.GetPixel(x, y - 1))
                        image.SetPixel(x, y - 1, Color.Red);
                }
            }
pictureBox3.Image = image;

When I run my program, the result didn't change
I think the color of a pixel is very small,
We can't see by eyes
Thank!!

You are getting closer to the solution. Anyway, two things to improve:

- use two distinct images: one with the original data, let it be "image", one for the classification only, i.e. the result of K-means clustering, let it be "cluster"; this image will be grayscale;

- the way to detect border pixels is not exactly as you wrote.

The complete procedure is as follows:

- perform K-means clustering

- in "cluster", assign every pixel a value 1, 2 or 3, depending on the nearest class center for the corresponding pixel in "image"

- then scan "cluster" and detect the border pixels as follows:

for (int x = 1; x < image.Width-1; x++)
{
    for (int y = 1; y < image.Height-1; y++)
    {
        if (cluster.GetPixel(X, Y) != cluster.GetPixel(X - 1, Y) ||
            cluster.GetPixel(X, Y) != cluster.GetPixel(X + 1, Y) ||
            cluster.GetPixel(X, Y) != cluster.GetPixel(X, Y - 1) ||
            cluster.GetPixel(X, Y) != cluster.GetPixel(X, Y + 1))
        {
           // This is a border pixel, color it after its cluster index
           switch (cluster.GetPixel(X, Y))
            {
            case 1: image.SetPixel(X, Y, Color.Red);   break;
            case 2: image.SetPixel(X, Y, Color.Green); break;
            case 3: image.SetPixel(X, Y, Color.Blue);  break;
            }
        }
    }
}

)

Thank YDaoust helped me.
I solved my problem.
Regards,