Qt creator 调用 opencv 库

系统环境：

debian9

opencv3.2

qt 5.6.1

使用qt创建一个c++空项目

然后在.pro 文件做以下更改

注意，路径和版本可能存在差异，要根据电脑的实际路径进行更改

INCLUDEPATH += /usr/local/include/opencv \
                   /usr/local/include/opencv2

LIBS += /usr/local/lib/libopencv_core.so.3.2
LIBS += /usr/local/lib/libopencv_core.so.3.2
LIBS += /usr/local/lib/libopencv_highgui.so.3.2
LIBS += /usr/local/lib/libopencv_core.so.3.2
LIBS += /usr/local/lib/libopencv_highgui.so.3.2
LIBS += /usr/local/lib/libopencv_calib3d.so.3.2
LIBS += /usr/local/lib/libopencv_features2d.so.3.2
LIBS += /usr/local/lib/libopencv_flann.so.3.2
LIBS += /usr/local/lib/libopencv_imgcodecs.so.3.2
LIBS += /usr/local/lib/libopencv_imgproc.so.3.2
LIBS += /usr/local/lib/libopencv_ml.so.3.2
LIBS += /usr/local/lib/libopencv_objdetect.so.3.2
LIBS += /usr/local/lib/libopencv_video.so.3.2

这里不是每个库都要添加的，具体看用到opencv哪些头文件就用哪些库。

最后修改main.cpp文件

#include <opencv2/opencv.hpp>

using namespace cv;

int main()
{
    Mat img = imread("./1.jpg");
    imshow("image",img);
    waitKey(0);
    return 0;
}

运行没显示图片，找一张图片命名为1.jpg放到刚刚qt工程的构建目录里，我这里是目录名是build-opencvTest-Desktop_Qt_5_6_3_GCC_64bit-Debug，再次运行图片就有显示了。