CODEWITHSUNDEEP
opencv
hahaha1256
hahaha1256

Reputation: 51

findcontours finds too many contours

Is it normal that find contours finds so many contours where there are obviously only 3 contours ?

The original image and after drawing found contours are shown below : enter image description here

enter image description here

The code is :

Mat image;
    vector<vector<Point> > contours;
    vector<Vec4i> hierarchy;
    image = imread(argv[1], 0);   // Read the file
    findContours(image, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0));
    cout << contours.size();


    RNG rng(12345);
    Mat drawing = Mat::zeros(image.size(), CV_8UC3);
    for (int i = 0; i< contours.size(); i++)
    {
        Scalar color = Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255));
        drawContours(drawing, contours, i, color, 2, 8, hierarchy, 0, Point());
    }
    /// Show in a window
    namedWindow("Contours", CV_WINDOW_AUTOSIZE);
    imshow("Contours", drawing);
namedWindow("Display window", WINDOW_AUTOSIZE);// Create a window for display.
    imshow("Display window", image);                   // Show our image inside it.

Upvotes: 0

Views: 1154

Answers (1)

Balaji R
Balaji R

Reputation: 1843

I think you are Reading a Jpeg or any other compressed version of your actual input image which adds these noise. Find contours needs Binary image. If you want to process this image simple apply threshold before finding contours! Note that your source image is working fine for me! enter image description here

Upvotes: 3

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