【问题标题】：Error linking cv::ximproc library to project将 cv::ximproc 库链接到项目时出错
【发布时间】：2016-04-12 15:37:56
【问题描述】：

using namespace std;
using namespace cv;
using namespace cv::ximgproc;

类立体声的功能：

 void stereo_matcher::cpu_sgbm_matcher(cv::Mat& IL, cv::Mat& IR, int min_disp, int max_disp)
    {
        int cn = IL.channels();
    int winsize =9; //3

//    Ptr<StereoSGBM> sgbm = StereoSGBM::create(0,256,9,0,0,1,63);
     Ptr<StereoSGBM> left_matcher = StereoSGBM::create(0,max_disp,winsize);

    left_matcher->setPreFilterCap(63);
    left_matcher->setBlockSize(winsize);
    left_matcher->setP1(8*cn*winsize*winsize); //8
    left_matcher->setP2(32*cn*winsize*winsize); //32
    left_matcher->setMinDisparity(min_disp);
    left_matcher->setNumDisparities(max_disp);
    left_matcher->setUniquenessRatio(10);
    left_matcher->setSpeckleWindowSize(100);
    left_matcher->setSpeckleRange(32);
    left_matcher->setDisp12MaxDiff(1);
    left_matcher->setMode(StereoSGBM::MODE_HH);

    left_matcher->compute(IL, IR, disp16L);

   Ptr<StereoMatcher> right_matcher = createRightMatcher(left_matcher);

    right_matcher->compute(IR, IL, disp16R);

//    cout<<disp16L<<endl;

    Mat filtered_disp;
    Mat conf_map = Mat(IL.rows,IL.cols,CV_8U);
    conf_map = Scalar(255);
    Ptr<DisparityWLSFilter> wls_filter=createDisparityWLSFilter(left_matcher);
//    wls_filter = createDisparityWLSFilter(left_matcher);
    cout<<"Here§§"<<endl;
    wls_filter->setLambda(8000);

    wls_filter->setSigmaColor(1.5);


    double filtering_time = (double)getTickCount();
    wls_filter->filter(disp16L,IL,filtered_disp,disp16R);
    filtering_time = ((double)getTickCount() - filtering_time)/getTickFrequency();
    cout<<"Filtering time: "<<filtering_time<<"s"<<endl;


    disp16L=filtered_disp.clone();

    disp16L.convertTo(disp32F, CV_32F,(double)1.0/(16.0),0.0);

//    //! [visualization]
//    double vis_mult=1.0;
//    Mat raw_disp_vis;
//    cv::ximgproc::getDisparityVis(disp16L,raw_disp_vis,vis_mult);
//    namedWindow("raw disparity", WINDOW_AUTOSIZE);
//    imshow("raw disparity", raw_disp_vis);
//    Mat filtered_disp_vis;
//    cv::ximgproc::getDisparityVis(filtered_disp,filtered_disp_vis,vis_mult);
//    namedWindow("filtered disparity", WINDOW_AUTOSIZE);
//    imshow("filtered disparity", filtered_disp_vis);
//    waitKey(0);
//    //! [visualization]

}

我做了什么：我正在关注以下示例： https://github.com/Itseez/opencv_contrib/blob/master/modules/ximgproc/samples/disparity_filtering.cpp

我已经从以下程序安装了 Opencv 额外模块： https://github.com/Itseez/opencv_contrib

问题：即使我的 IDE(Qt) 识别头文件

包括

编译时出现以下错误： ../../lib/libstereo.a(stereo_matcher.cpp.o)：在函数stereo_matcher::cpu_sgbm_matcher(cv::Mat&, cv::Mat&, int, int)': stereo_matcher.cpp:(.text+0xcc9): undefined reference tocv::ximgproc::createDisparityWLSFilter(cv::Ptr)' collect2：错误：ld 返回 1 个退出状态 make[2]: * [../bin/test_stereo] 错误 1 make[1]: * [apps/CMakeFiles/test_stereo.dir/all] 错误 2

如何链接这个 OpenCV 库

提前感谢您的帮助

【问题讨论】：

标签： opencv opencv3.0

【解决方案1】：

在 Qt Creator 中，我添加了 .pro 文件行 LIBS += -lopencv_ximgproc，它帮助了我。（Qt 5.11、OpenCV 3.2、Linux Ubuntu 18.04）

INCLUDEPATH += /usr/local/include/opencv
....
LIBS += -lopencv_ximgproc

您的文件夹中应该有/usr/local/include/opencv 库文件

libopencv_ximgproc.so

【讨论】：