Question

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

我想阅读并在此代码中显示图片

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();
}

当我运行我的项目时，它会显示以下消息：

启动/ home / vasan / Qt / build-OpenCVWithQt-Desktop-Debug / OpenCVWithQt ...
该计划意外完成 / home / vasan / Qt / build-OpenCVWithQt-Desktop-Debug / OpenCVWithQt退出代码为0

Answer 1

我也一直试图为Qt Creator设置OpenCV几天了。我建议你尝试

中的程序

https://code.google.com/p/qt-opencv-multithreaded/wiki/Documentation

它很容易遵循，它只是工作。当你到达1.3节时，运行你手头的任何代码示例。我用过：

int main( int argc, char** argv )
{
    if( argc != 2)
    {
     cout <<" Usage: display_image ImageToLoadAndDisplay" << endl;
     return -1;
    }

    Mat image;
    image = imread(argv[1], CV_LOAD_IMAGE_COLOR);   // Read the file
    image = imread("lena.png", CV_LOAD_IMAGE_COLOR);   // Read the file
    if(! image.data )                              // Check for invalid input
    {
        cout <<  "Could not open or find the image" << std::endl ;
        return -1;
    }

    namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display.
    imshow( "Display window", image );                   // Show our image inside it.

    waitKey(0);                                          // Wait for a keystroke in the window
    return 0;
}

希望有所帮助！

Answer 2

它对我有用：

INCLUDEPATH += /usr/local/include/opencv2
LIBS += -L/usr/local/lib
LIBS += -lopencv_core
LIBS += -lopencv_imgproc
LIBS += -lopencv_highgui
LIBS += -lopencv_ml
LIBS += -lopencv_video
LIBS += -lopencv_features2d
LIBS += -lopencv_calib3d
LIBS += -lopencv_objdetect
LIBS += -lopencv_contrib
LIBS += -lopencv_legacy
LIBS += -lopencv_flann
LIBS += -lopencv_nonfree

Answer 3

您的代码是正确的。我认为问题出现是因为你正在使用阴影构建。因此，您应该将图像放在阴影构建文件夹（包含可执行文件的文件夹）中，而不是放在项目文件夹中（仅包含代码文件）。

另一个提示是在 if 的情况下插入 return 语句，这样程序在找不到图像时就不会退出。

 if( matInput.empty())
 {
      qDebug() << "Can't load image";
      return;
 }

另外，请务必添加以下标题

#include <QDebug>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

在Qt Creator Ubuntu 12.04中设置OpenCV

3 个答案: