how to get a particular number plate frame in emgu

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C#

Emgu-CV

hi i am doing number plate detection in emgu c#.i want to detect only the number plate of a vehicle.my project is running without any exception or errors but i am getting more frames including frames of number plate.my prob is i want only number plate frame.pls help me.i cant find solution for this for more than a month.
here is my code

namespace NumberPlateRecognition
{
    public partial class npr : Form
    {
        
        private Tesseract tess;
        private Capture _capture = null;
        Image<Bgr, Byte> frame;
        private LicensePlateDetector _licensePlateDetector;

         public npr()
        {

            InitializeComponent();
            _licensePlateDetector = new LicensePlateDetector("");
            _capture = new Capture();

            tess = new Tesseract("tessdata", "eng", Tesseract.OcrEngineMode.OEM_DEFAULT);//**comment**//

           
        }

        private delegate void displaydelegate(Bitmap image, PictureBox control);
        private void displayimage(Bitmap image, PictureBox control)
        {
            if (picCamera.InvokeRequired)
            {
                try
                {
                    displaydelegate di = new displaydelegate(displayimage);
                    this.BeginInvoke(di, new object[] { image, control });
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
            else
            {
                control.Image = image;
            }
        }

        private void ProcessImage(Image<Bgr, byte> image)
        {
            List<Image<Gray, Byte>> licensePlateImagesList = new List<Image<Gray, byte>>();
            List<Image<Gray, Byte>> filteredLicensePlateImagesList = new List<Image<Gray, byte>>();
            List<MCvBox2D> licenseBoxList = new List<MCvBox2D>();
            List<string> words = _licensePlateDetector.DetectLicensePlate(
               image,
               licensePlateImagesList,
               filteredLicensePlateImagesList,
               licenseBoxList);

            panel1.Controls.Clear();
            Point startPoint = new Point(10, 10);
            for (int i = 0; i < words.Count; i++)
            {
                AddLabelAndImage(
                   ref startPoint,
                   String.Format("License: {0}", words[i]),
                   licensePlateImagesList[i].ConcateVertical(filteredLicensePlateImagesList[i]));
                image.Draw(licenseBoxList[i], new Bgr(Color.Red), 2);
            }

            displayimage(image.Bitmap, picCamera);
            

        }

       
        public Image<Bgr, byte> GetFrame(double frameNum)
        {
            _capture.SetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_POS_FRAMES,1);
            _capture.SetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_WIDTH,800);
            _capture.SetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_HEIGHT,500);
            return _capture.QueryFrame();
        }
        private void timerCapture_Tick(object sender, EventArgs e)
        {

            frame = _capture.QueryFrame();
            Image<Gray, byte> yellow = frame.InRange(new Bgr(80, 150, 150), new Bgr(170, 255, 255));
            
            Image<Gray, byte> white = frame.InRange(new Bgr(100, 100, 150), new Bgr(205, 200, 255));
            ProcessImage(frame);
          
           displayimage(white.Bitmap, picLicenceAreaGray);
        }