CODEWITHSUNDEEP
c#emgucvedge-detection
Apuna12
Apuna12

Reputation: 239

EmguCV Canny black window

i have another question. Idk what is happening buti tried to make Canny edge detector. Problem is that when i want to detect edges on simple shape like square, the program is able to detect it. But when i want to detect shapes on not very simple image program just gives me image filled by only black color. Do you guys have an idea what is going on?

I use this code below:

 public Bitmap CannyEdge(Bitmap bmp)
    {
        Image<Gray, Byte> Cannybmp;
        Image<Gray, Byte> GrayBmp;
        Image<Bgr, Byte> orig = new Image<Bgr, Byte>(bmp);
        Image<Bgr, Byte> imgSmooth;
        Bitmap output;

        imgSmooth = orig.PyrDown().PyrUp();
        imgSmooth._SmoothGaussian(3);
        GrayBmp = imgSmooth.Convert<Gray, byte>();

        Gray grayCannyThreshold = new Gray(160.0);
        Gray grayThreshLinking = new Gray(80.0);

        Cannybmp = GrayBmp.Canny(grayCannyThreshold.Intensity, grayThreshLinking.Intensity);
        output = Cannybmp.ToBitmap();

        //int a = 5;
        return output;

    }

private void button1_Click(object sender, EventArgs e)
    {
        Bitmap bmp = new Bitmap(pictureBox1.Image);
        pictureBox2.Image = CannyEdge(bmp);
    }

Upvotes: 2

Views: 4452

Answers (1)

E.Solicito
E.Solicito

Reputation: 91

Did you try to set your grayCannyThreshold to become lesser the value of your grayThreshLinking?

Gray grayCannyThreshold = new Gray(80.0);
Gray grayThreshLinking = new Gray(160.0);

Upvotes: 1

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