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if (area > largest_area)
    {
        largest_area = area;
        largest_contour_index = i;               //Store the index of largest contour

    }

}
bounding_rect = boundingRect(contours[largest_contour_index]); // Find the bounding rectangle for biggest contour
Ncontours.push_back(contours[largest_contour_index]);
rectangle(thr, bounding_rect, cv::Scalar(255, 255, 255));