vector<Rect> detectContours(Mat img)
{
    std::vector<cv::Rect> boundRect;
    std::vector<std::vector<cv::Point> > contours;
    cv::findContours(img, contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);

    std::vector<std::vector<cv::Point> > contours_poly(contours.size());
    for (int i = 0; i < contours.size(); i++) {
        std::vector<cv::Point> contour = contours[i];
        if (contour.size() > 1) {
            cv::approxPolyDP(cv::Mat(contours[i]), contours_poly[i], 1, true);
            cv::Rect appRect(boundingRect(cv::Mat(contours_poly[i])));
            if ((appRect.height > 200) && (appRect.width > 200) && (appRect.width * 1.0 / appRect.height) > 1.5 ) {
                boundRect.push_back(appRect);
                //break;
            }
        }
    }
    return boundRect;
}