Question

I´m using Kinect (Microsoft SDK) with XNA. I want to use GRATF for marker-recognition

How to convert the data of a Kinect ColorImageFrame to a System.Drawing.Bitmap or AForge.Imaging.UnmanagedImage that I can process them with GRATF?

void kinectSensor_ColorFrameReady(object sender, ColorImageFrameReadyEventArgs e)
{
    Bitmap bitmap = null;
    ColorImageFrame frame = e.OpenColorImageFrame();
    byte[] buffer = new byte[frame.PixelDataLength];
    frame.CopyPixelData(buffer);

    // how to convert the data in buffer to a bitmap?

    var glyphs = recognizer.FindGlyphs(bitmap);

    ...
}

Answer 1

You can find the answer in this article.
To summarize it, this method should do the trick:

Bitmap ImageToBitmap(ColorImageFrame img)
{
     byte[] pixeldata = new byte[img.PixelDataLength];
     img.CopyPixelDataTo(pixeldata);
     Bitmap bmap = new Bitmap(img.Width, img.Height, PixelFormat.Format32bppRgb);
     BitmapData bmapdata = bmap.LockBits(
         new Rectangle(0, 0, img.Width, img.Height),
         ImageLockMode.WriteOnly, 
         bmap.PixelFormat);
     IntPtr ptr = bmapdata.Scan0;
     Marshal.Copy(pixeldata, 0, ptr, img.PixelDataLength);
     bmap.UnlockBits(bmapdata);
     return bmap;
 }