为什么我看不到我的轨迹栏中的价值？

Question

我的运行环境如下：

Mac OSX EI 10.11.5

opencv 2.4.13

Xcode版本7.3.1

为什么没有在轨道栏上显示我的值作为附图。

这是因为系统问题？

感谢

main()

{
VideoCapture cap(0); 

if ( !cap.isOpened() )  // if not success, exit program
{
    cout << "Cannot open the cam" << endl;
    return -1;
}

namedWindow("Thresholded Image", CV_WINDOW_AUTOSIZE); //create a window called "Control"

int iLowH = 0;
int iHighH = 179;

int iLowS = 0;
int iHighS = 255;

int iLowV = 0;
int iHighV = 255;

cvCreateTrackbar("LowH", "Thresholded Image", &iLowH, 179); 
cvCreateTrackbar("HighH", "Thresholded Image", &iHighH, 179);

cvCreateTrackbar("LowS", "Thresholded Image", &iLowS, 255);
cvCreateTrackbar("HighS", "Thresholded Image", &iHighS, 255);

cvCreateTrackbar("LowV", "Thresholded Image", &iLowV, 255); 
cvCreateTrackbar("HighV", "Thresholded Image", &iHighV, 255);

while (true)
{
    Mat imgOriginal;

    bool bSuccess = cap.read(imgOriginal); // read a new frame from video

    if (!bSuccess) //if not success, break loop
    {
        cout << "Cannot read a frame from video stream" << endl;
        break;
    }

    Mat imgHSV;

    cvtColor(imgOriginal, imgHSV, COLOR_BGR2HSV); //Convert the captured frame from BGR to HSV

    Mat imgThresholded;

    inRange(imgHSV, Scalar(iLowH, iLowS, iLowV), Scalar(iHighH, iHighS, iHighV), imgThresholded); //Threshold the image

    erode(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(5, 5)) );
    dilate( imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(5, 5)) );

    dilate( imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(5, 5)) );
    erode(imgThresholded, imgThresholded, getStructuringElement(MORPH_ELLIPSE, Size(5, 5)) );

    namedWindow("Thresholded Image", 0);
    namedWindow("Original", CV_WINDOW_NORMAL);

    resize(imgThresholded,imgThresholded, Size(imgThresholded.cols/3, imgThresholded.rows/3));
    namedWindow("Thresholded Image", CV_WINDOW_AUTOSIZE);
    imshow("Thresholded Image", imgThresholded); //show the thresholded image

    resize(imgOriginal,imgOriginal, Size(imgOriginal.cols/3, imgOriginal.rows/3));
    namedWindow("Original", CV_WINDOW_AUTOSIZE);
    imshow("Original", imgOriginal); //show the original image

    if (waitKey(30) == 27) //wait for 'esc' key press for 30ms. If 'esc' key is pressed, break loop
    {
        cout << "esc key is pressed by user" << endl;
        break; 
    }
}

return 0;

}

ErrorReporter.handleException