Edge

Разпознаване на геометрични обекти

Намиране на ръбове(Edge Detection)

Матлаб

im = imread("lena.tif");

Sy = [-1 -2 -1; 0 0 0; 1 2 1];
Sx = Sy';

Gr = im(:,:,1)*0.2+im(:,:,2)*0.7+im(:,:,3)*0.1;

DimY = conv2(Sy,Gr);
DimX = conv2(Sx,Gr);

DimYn = DimY./max(max(DimY));
DimXn = DimX./max(max(DimX));
figure
imshow(DimYn);
figure
imshow(DimXn);


Dim = (DimY.^2 + DimX.^2).^(1/2);
Dimn = Dim./max(max(Dim));
figure
imshow(Dimn)
figure
imshow(Dimn > 0.2)

OpenCV

Edge detection

namespace WindowsFormsApplication1 {

   public partial class Form1 : Form
   {
       public Form1()
       {
           InitializeComponent();
       }

       private DispatcherTimer timer = new DispatcherTimer();

       private Capture cap = new Capture();
       Image<Bgr, byte> frame;

       private void Form1_Load(object sender, EventArgs e)
       {
           this.Size = new System.Drawing.Size(100, 100);
           frame = cap.QueryFrame();
           this.Size = frame.Size;

       }

       private void pictureBox1_Click(object sender, EventArgs e)
       {
           Bgr color = new Bgr(255, 0, 0);
           frame = new Image<Bgr, byte>(this.Size.Width, this.Size.Height, color);

           pictureBox1.Image = frame.Bitmap;

           Thread workerThread = new Thread(showImage);
           workerThread.Start();

       }

       private void button1_Click(object sender, EventArgs e)
       {

       }

       void showImage()
       {
           MCvFont font = new MCvFont(Emgu.CV.CvEnum.FONT.CV_FONT_HERSHEY_PLAIN, 10.0, 10.0);

           Bgr color = new Bgr(255, 255, 255);
           Bgr Bcolor = new Bgr(255, 0, 0);

           frame = new Image<Bgr, byte>(frame.Size.Width, frame.Size.Height, Bcolor);

           frame.Draw("0", ref font, new Point(250, 250), color);
           pictureBox1.Image = frame.Bitmap;
           System.Threading.Thread.Sleep(1000);

           frame = new Image<Bgr, byte>(frame.Size.Width, frame.Size.Height, Bcolor);
           frame.Draw("1", ref font, new Point(250, 250), color);
           pictureBox1.Image = frame.Bitmap;
           System.Threading.Thread.Sleep(1000);

           frame = new Image<Bgr, byte>(frame.Size.Width, frame.Size.Height, Bcolor);
           frame.Draw("2", ref font, new Point(250, 250), color);
           pictureBox1.Image = frame.Bitmap;
           System.Threading.Thread.Sleep(1000);

           frame = cap.QueryFrame();
           pictureBox1.Image = frame.Bitmap;
           System.Threading.Thread.Sleep(1000);

           timer.Tick += new EventHandler(timer_tick);
           timer.Interval = new TimeSpan(0, 0, 0, 0, 35);
           timer.Start();
           

       }

       void timer_tick(object sender, EventArgs e)
       {
           frame = cap.QueryFrame();
           Image<Gray, Byte> cannyEdges = frame.Convert<Gray, Byte>().Canny(100, 60);//cannyThreshold, cannyThresholdLinking);
           pictureBox1.Image = cannyEdges.Bitmap;
       }

   }

}