Edge

From Ilianko

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

Размер на изображението (кадъра)
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;
        }



    }
}
Objects detection

Motion detection

Change background

webcam

<!DOCTYPE html>
<html>
<head>

<script type="text/javascript">

refreshImage = function()
{
  img = document.getElementById("cam");
  img.src="xxx.jpg?"+Math.random();
}
</script>

<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />

<title>Auto-Refresh</title>

</head>

<body onload="window.setInterval(refreshImage, 1*1000);">
<img src="xxx.jpg?xxx" id="cam" />
</body>
</html>
Image MySystemImage = frame.ToBitmap();
MySystemImage.Save("xxx.jpg", ImageFormat.Jpeg);
using System.IO;
using System.Drawing.Imaging;