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创建Qt Console 项目：
main.cpp 代码如下：
很简单就是加载一张图片后显示出来，就和所有语言的Hello World一样

#include <QCoreApplication>
#include <QCoreApplication>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

int main(int argc,char *argv[]) {
    cv::Mat image = cv::imread("/home/jimmy/games.jpg",cv::IMREAD_GRAYSCALE);
    cv::imshow("Test Opencv",image);
    cv::waitKey(0);
    cv::destroyAllWindows();
}

在pro文件中添加如下包含关系： 

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

LIBS += /usr/local/lib/libopencv_highgui.so \
        /usr/local/lib/libopencv_core.so    \
        /usr/local/lib/libopencv_imgproc.so \
        /usr/local/lib/libopencv_imgcodecs.so

整个pro文件如下所示：

QT       += core
QT       -= gui
TARGET = LearnOpencv
CONFIG   += console
CONFIG   -= app_bundle
TEMPLATE = app
SOURCES += main.cpp

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

LIBS += /usr/local/lib/libopencv_highgui.so \
        /usr/local/lib/libopencv_core.so    \
        /usr/local/lib/libopencv_imgproc.so \
        /usr/local/lib/libopencv_imgcodecs.so

Ctrl + R 就可以看到一个图片以灰度图的形式加载进来。

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