Ubuntu14.04下使用QTcreator构建OpenCV工程

1. 打开qtcreator创建一个空的QT项目
2. 在.pro文件中添加如下内容：
    #头文件包含路径
INCLUDEPATH += /usr/local/include/opencv\
       /usr/local/include/opencv2

#引入的lib文件路径，此处opencv版本为3.0.0
LIBS +=/usr/local/lib/libopencv_calib3d.so.3.0.0\
           # /usr/local/lib/libopencv_contrib.so.3.0.0\
            /usr/local/lib/libopencv_core.so.3.0.0\
            /usr/local/lib/libopencv_features2d.so.3.0.0\
            /usr/local/lib/libopencv_flann.so.3.0.0\
           # /usr/local/lib/libopencv_gpu.so.3.0.0\
            /usr/local/lib/libopencv_highgui.so.3.0.0\
            /usr/local/lib/libopencv_imgproc.so.3.0.0\
            /usr/local/lib/libopencv_ml.so.3.0.0\
            /usr/local/lib/libopencv_objdetect.so.3.0.0\
            /usr/local/lib/libopencv_photo.so.3.0.0\
            /usr/local/lib/libopencv_stitching.so.3.0.0\
            /usr/local/lib/libopencv_superres.so.3.0.0\
            /usr/local/lib/libopencv_ts.a\
            /usr/local/lib/libopencv_video.so.3.0.0\
            /usr/local/lib/libopencv_videostab.so.3.0.0
LIBS += -L/usr/local/lib -lopencv_core -lopencv_imgcodecs -lopencv_highgui
注：如果不添加后面这句LIBS += -L/usr/local/lib -lopencv_core -lopencv_imgcodecs -lopencv_highgui，在使用qtcreator编译时会报错，具体原因不清楚。参考链接：http://answers.opencv.org/question/57999/qt-error-maino-undefined-reference-to-symbol-_zn2cv6string10deallocateev/

3. 在项目中添加main.cpp

#include <opencv2/opencv.hpp>
using namespace cv;
int main()
{
    Mat img = imread("lena.jpg");
    if (img.empty())
    {
        fprintf(stderr, "Error: load image failed.");
        return -1;
    }
    namedWindow("image", WINDOW_AUTOSIZE);
    imshow("image", img);
    waitKey();
    return 0;
}

4. 将lena.jpg文件放在工程文件夹中，编译运行.