How we can Detect Moving Vehicle in C#

public partial class Form1 : Form
    {
        static Bitmap img;      
      
        private void timer1_Tick(object sender, EventArgs e)
        {
            Directory.CreateDirectory(Environment.GetFolderPath(Environment.SpecialFolder.MyComputer) + @"C:\new\Pranay\ScreenCaptures");        

            if (!string.IsNullOrEmpty(axWindowsMediaPlayer1.URL))
            {               
                Image ret = null;
                try
                {

//--------------------------------------------------- take picture BEFORE saveFileDialog pops up!!-----------------------------------------------------
                    Bitmap bitmap = new Bitmap(axWindowsMediaPlayer1.Width, axWindowsMediaPlayer1.Height);

                    //EuclideanColorFiltering filter = new EuclideanColorFiltering();
                    //filter.CenterColor = Color.FromArgb(215, 30, 30);
                    //filter.Radius = 100;
                    //filter.ApplyInPlace(bitmap);

                    //    newPicBox.Image = bitmap;

                    {
                        Graphics g = Graphics.FromImage(bitmap);
                        {
                            Graphics gg = axWindowsMediaPlayer1.CreateGraphics();
                            {
                                FrameTimer.Start();
                                this.BringToFront();
                                g.CopyFromScreen(axWindowsMediaPlayer1.PointToScreen(new System.Drawing.Point()).X, axWindowsMediaPlayer1.PointToScreen(new System.Drawing.Point()).Y, 0, 0, new System.Drawing.Size(axWindowsMediaPlayer1.Width, axWindowsMediaPlayer1.Height - 60));

                                FramepictureBox.Image = bitmap;

                                //Change the color of the pixel=-------------------Image comparing--------------------------------------------------

                                Bitmap img1 = bitmap;
                                if (img != null)
                                {

                                    float avg = 0;
                                    float avg1 = 0;

                                    if (img1.Width == img.Width && img1.Height == img.Height)
                                    {
                                        for (int i = 170; i < 296; i++)
                                        {
                                            for (int j = 70; j < 100; j++)
                                            {
                                                // img1.SetPixel(i, j, Color.Red);
                                                Color img1_ref = img1.GetPixel(i, j);
                                                Color img2_ref = img.GetPixel(i, j);
                                                float oneR = img1_ref.R;
                                                float twoR = img2_ref.R;
                                                float diffR = Math.Abs(oneR - twoR);

                                                float oneG = img1_ref.G;
                                                float twoG = img2_ref.G;
                                                float diffG = Math.Abs(oneG - twoG);
                                                float oneB = img1_ref.B;
                                                float twoB = img2_ref.B;
                                                float diffB = Math.Abs(oneB - twoB);
                                                float perR = (diffR / 255) * 100;
                                                float perG = (diffG / 255) * 100;
                                                float perB = (diffB / 255) * 100;
                                                float netPer = (perB + perG + perR) / 3;
                                                avg += netPer;
                                            }
                                        }
                                        /*-------------------------------------------Second Rectangle----------------------------------------------*/

                                      same as above but change i Co-ordinates


                                        int totalPixels = 161 * 50;

                                        int totalPixels1 = 20 * 166;

                                        float netAvg = avg / totalPixels;
                                        float netAvg1 = avg1 / totalPixels1;

                                        RGBlbl.Text = netAvg1.ToString();
                                        RGBlbl1.Text = netAvg.ToString();

                                        if (netAvg > 0.5)
                                        {
                                            if (netAvg1 > 2)
                                            {
                                              
                                                Pen pen = new Pen(Color.Red, 1);
                                                g.DrawRectangle(pen, 50, 120, 161, 50);
                                                using (MemoryStream ms = new MemoryStream())                                                {
                                                    bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                                                    ret = System.Drawing.Image.FromStream(ms);

                                                    ret.Save(Environment.GetFolderPath(Environment.SpecialFolder.MyComputer) + @"C:\new\Pranay\ScreenCaptures\" + "IMG" + i + ".jpeg", ImageFormat.Jpeg);

                                                }
                                                i++;
                                                ImageConverter converter = new ImageConverter();
                                                byte[] imgbit = (byte[])converter.ConvertTo(img1, typeof(byte[]));


                                                string strcon = "Data Source=U8-PC\\SQLEXPRESS;Initial Catalog=TrafficAnalysis;Integrated Security=true";
                                                SqlConnection mycon = new SqlConnection(strcon);
                                                mycon.Open();
                                                string strquery = "insert into Image(ImageData) values('" + imgbit + "')";
                                                SqlCommand cmd = new SqlCommand(strquery, mycon);
                                                cmd.ExecuteNonQuery();
                                            }
                                        }
                                        else
                                        {

                                        }
                                    }
                                }
                            }
                        }
                        //  afterwards save bitmap file if user wants to
                        img = bitmap;
                    }
                }
                catch (Exception ex)
                {
                    Debug.WriteLine(ex.Message);
                }
            }
        }