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   1: public Mat ConvertBitmapToMat(Bitmap bmp)

   2: {

   3:     // Lock the bitmap's bits.  

   4:     Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);

   5:  

   6:     System.Drawing.Imaging.BitmapData bmpData =

   7:         bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite,

   8:             bmp.PixelFormat);

   9:  

  10:     // data = scan0 is a pointer to our memory block.

  11:     IntPtr data = bmpData.Scan0;

  12:  

  13:     // step = stride = amount of bytes for a single line of the image

  14:     int step = bmpData.Stride;

  15:  

  16:     // So you can try to get you Mat instance like this:

  17:     Mat mat = new Mat(bmp.Height, bmp.Width, Emgu.CV.CvEnum.DepthType.Cv32F, 4, data, step);

  18:  

  19:     // Unlock the bits.

  20:     bmp.UnlockBits(bmpData);

  21:  

  22:     return mat;

  23: }

   1: using (OpenFileDialog ofd = new OpenFileDialog())

   2: {

   3:     if (ofd.ShowDialog() == DialogResult.OK)

   4:     {

   5:           Bitmap bmp = new Bitmap(ofd.FileName);

   6:           System.Drawing.Imaging.BitmapData bd;

   7:           bd = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height),

   8:                                        System.Drawing.Imaging.ImageLockMode.ReadWrite, 

   9:                                        System.Drawing.Imaging.PixelFormat.Format24bppRgb);

  10:           Image<Bgr, Byte> inputImage = new Image<Bgr, Byte>(bd.Width, bd.Height, bd.Stride, bd.Scan0);

  11:           pictureBox1.Image = inputImage.ToBitmap();

  12:           bmp.UnlockBits(bd);

  13:      }

  14: }