Qt + OpenCV - Displaying images on QLabel
===

I'm trying to capture live view from camera, and redirecting it to show up on QLabel.
But only half view comes (see below):
![Screenshot][1]


  [1]: http://i.stack.imgur.com/n8xDJ.png

The left hand side window, is shown using cv::imshow(), which works perfectly.
I'm capturing the Mat in a different thread, and then emitting a signal with a Qimage as a parameter, and then setting the image to the QLabel in the slot.

here's the code:

    while(true){
        cam >> mat;
        cv::imshow("name",mat);
        emit send_UIupdate(mat2qimage(mat));
    }

and in the slot setting the image to Qlabel:

    void Dialog::updateUI(const QImage &img){
        label->setPixmap(QPixmap::fromImage(img));
    }

using the below to convert Mat to QImage:

    QImage camera::mat2qimage(const cv::Mat& mat) {
        cv::Mat rgb;
        cv::cvtColor(mat, rgb, CV_BGR2RGB);
        return QImage((const unsigned char*)(rgb.data), rgb.cols, rgb.rows, QImage::Format_RGB888);
    }


**Any suggestions, to solve this problem ??**