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在Qt Creator Ubuntu 12.04中设置OpenCV

我正在尝试在Qt Creator中设置OpenCV,但我遇到了一些问题.我在Qt Creator .pro文件中添加了OpenCV路径

INCLUDEPATH += /usr/local/include/opencv
LIBS += -L/usr/local/lib \
-lopencv_core \
-lopencv_imgproc \
-lopencv_highgui \
-lopencv_ml \
-lopencv_video \
-lopencv_features2d \
-lopencv_calib3d \
-lopencv_objdetect \
-lopencv_contrib \
-lopencv_legacy \
-lopencv_flann

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我想阅读并在此代码中显示图像

void MainWindow::on_pushButton_clicked()
{
     cv::Mat matInput = cv::imread("LP.jpg");
     if( matInput.empty())
     {
          std::cout<<"Can't load image "<<std::endl;
     }
     cv::namedWindow("Show");
     cv::imshow("Show", matInput);
     cv::waitKey();
}

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当我运行我的项目时,它显示以下消息: