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Hi, I have the following problem: I must find a red ball on a field. I transformed my picture to HSV colorspace and used the inRange function to separate the red color. Now I'm trying to draw an rectangle at the position, where the red colored object is and to show it in the original video, but I have no plan how I can do this.

Thank you Dennis

Here is my actual code

    #include <iostream>
    #include <opencv2/opencv.hpp>

    using namespace cv;
    using namespace std;

    int main()
    {
        VideoCapture cap("test.mp4");

        // Define Color
        Scalar upperRed(180, 255, 255);
        Scalar lowerRed(125, 52, 67);

        while (1) {

            Mat frame, hsv;
            // Capture frame-by-frame
            cap >> frame;

            // If the frame is empty, break immediately
            if (frame.empty())
                break;
            GaussianBlur(frame, frame,Size(5,5) , 0);
            // Display the resulting frame in HSV
            cvtColor(frame, hsv, COLOR_BGR2HSV);
            // Color detection
            inRange(hsv, lowerRed, upperRed, frame);

            // Show images
            imshow("bye", hsv);
            imshow("hallo", frame);

            // Press  ESC on keyboard to exit
            char c = (char)waitKey(25);
            if (c == 27)
                break;
        }
        cap.release();
        destroyAllWindows;
        return 0;
    }

C:\fakepath\hallo.PNG C:\fakepath\Unbenannt.PNG