qt 使用OpenCV

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使用MinGW编译OpenCV源码

下载OpenCV源码、CMake编译工具

编译安装完：



Qt工程配置

INCLUDEPATH += D:/qt_work/opencv/build/install/include/LIBS += -LD:/qt_work/opencv/build/install/x86/mingw/bin \
-lopencv_core411 \
-lopencv_imgcodecs411 \
-lopencv_highgui411


举例一

#include "opencv2/opencv.hpp"
using namespace cv;Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this); Mat img = imread("D:/4.jpg");
if (img.empty())
{
std::cout << "Error: load image failed." << std::endl;
return;
}
imshow("myImage", img);
waitKey(0);
}


举例二

Qt工程文件增加库文件引用

LIBS += -lopencv_imgproc411


Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this); Mat img = imread("D:/4.jpg");
if (img.empty())
{
std::cout << "Error: load image failed." << std::endl;
return;
} if(img.channels()==3)
{
cvtColor(img,img,COLOR_BGR2RGB);
}
QImage qImag = QImage(img.data, img.cols, img.rows, QImage::Format_RGB888);
ui->label->setPixmap(QPixmap::fromImage(qImag.scaled(ui->label->size())));
}