一. Opencv的安装及配置

Qt有两种版本：mingw版本和MSVC版本。1.MSVC是指微软的VC编译器；2.MinGW是指是Minimalist GNU on Windows的缩写。它是一个可自由使用和自由发布的Windows特定头文件和使用GNU工具集导入库的集合，允许你在GNU/Linux和Windows平台生成本地的Windows程序而不需要第三方C运行时库，详见《Qt： MinGW 与MSVC的区别》。

1.1 OpenCV下载

下载路径：https://opencv.org/releases/

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解压到当前路径下：

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2.2 配置环境变量

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二. Qt框架下使用OpenCV

2.1 在Pro中配置OpenCV

第一种方式：

QT += core
QT -= gui
CONFIG += c++11
TARGET = myOpencvTest1
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp
INCLUDEPATH += C:\OpenCv4.0\include  \
               C:\OpenCv4.0\include\opencv2
CONFIG(debug, debug|release): {
LIBS += C:\OpenCv4.0\x64\vc14\lib\opencv_world400d.lib
} else:CONFIG(release, debug|release): {
LIBS += C:\OpenCv4.0\x64\vc14\lib\opencv_world400.lib
}

第二种方式：

QT += core
QT -= gui
CONFIG += c++11
TARGET = myOpencvTest1
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp
INCLUDEPATH += C:\OpenCv4.0\include  \
               C:\OpenCv4.0\include\opencv2
CONFIG(debug, debug|release): {
LIBS += -LC:\OpenCv4.0\x64\vc14\lib \
        -lopencv_world400d
} else:CONFIG(release, debug|release): {
LIBS += -LC:\OpenCv4.0\x64\vc14\lib \
        -lopencv_world400
}

2.2 测试例子

#include <QCoreApplication>
#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/core.hpp>
#include <opencv2/imgcodecs.hpp>
//#include <opencv2/highgui.hpp>
#include <QDebug>
#include <QDir>
#include <QFile>
using namespace std;
using namespace cv;
int main()
{
    string strFileName;
    //! 方式1 绝对路径 单斜杠
    //strFileName = "C:/1.png";
    //! 方式2 绝对路径 双斜杠
    //strFileName = "C://1.png";
    //! 方式3 绝对路径 双斜杠
    //strFileName = "C:\\1.png";
    //! 方式4 默认路径
    qDebug()<<QDir().currentPath();
    strFileName = "/1.png";
    Mat matImg;
    matImg = imread(strFileName, IMREAD_COLOR);
    if (matImg.empty()){
        qDebug("erro");
        return -1;
    }
    qDebug()<<matImg.cols<<matImg.rows;
    imshow("oringin", matImg);
    waitKey(0);
    return 1;
}