1. 准备工作
- opencv 编译， 参考： https://blog.csdn.net/qq_51355375/article/details/140857966
- vscode qt cmake工程创建及环境搭建： https://blog.csdn.net/qq_51355375/article/details/140752130
2. 引入opencv 头文件和链接库
2.1 配置环境变量
将目录 opecv 安装目录\install\x64\mingw\bin 配置到环境变量， 不然代码运行时会找不到动态库。
2.2 cmake 配置， 添加opencv 头文件， 依赖
c
# 查找库和头文件路径， opencv 安装 install目录
list(APPEND CMAKE_PREFIX_PATH "D:/workspace-opencv/opencv-4.10.0/build_qt_mingw/install")
# 查找OpenCV
find_package(OpenCV REQUIRED)
# 链接OpenCV库
target_link_libraries(${PROJECT_NAME} PRIVATE Qt${QT_VERSION_MAJOR}::Widgets ${OpenCV_LIBS})
# 包含OpenCV的头文件目录
target_include_directories(${PROJECT_NAME} PRIVATE ${OpenCV_INCLUDE_DIRS})CmakeLists.txt
c
cmake_minimum_required(VERSION 3.5)
project(app VERSION 0.1 LANGUAGES CXX)
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
# 查找库和头文件路径， opencv 安装 install目录
list(APPEND CMAKE_PREFIX_PATH "D:/workspace-opencv/opencv-4.10.0/build_qt_mingw/install")
# 查找OpenCV
find_package(OpenCV REQUIRED)
message(STATUS "OpenCV : ${OpenCV}")
message(STATUS "OpenCV found: ${OpenCV_FOUND}")
message(STATUS "OpenCV include dirs: ${OpenCV_INCLUDE_DIRS}")
message(STATUS "OpenCV libraries: ${OpenCV_LIBS}")
find_package(QT NAMES QT6 QT5 REQUIRED COMPONENTS Widgets)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets)
include_directories(${PROJECT_SOURCE_DIR}/include)
file(GLOB_RECURSE SRC_CPP_FILES src/*.cpp)
file(GLOB_RECURSE SRC_HEADER_FILES include/*.h)
set(PROJECT_SOURCES ${SRC_CPP_FILES} ${SRC_HEADER_FILES})
message(STATUS "src:${PROJECT_SOURCES}")
if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
qt_add_executable(app
MANUAL_FINALIZATION
${PROJECT_SOURCES}
)
# Define target properties for Android with Qt 6 as:
# set_property(TARGET qt_cmake_template APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR
# ${CMAKE_CURRENT_SOURCE_DIR}/android)
# For more information, see https://doc.qt.io/qt-6/qt-add-executable.html#target-creation
else()
if(ANDROID)
add_library(${PROJECT_NAME} SHARED
${PROJECT_SOURCES}
)
# Define properties for Android with Qt 5 after find_package() calls as:
# set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
else()
add_executable(${PROJECT_NAME}
${PROJECT_SOURCES}
)
endif()
endif()
# 链接OpenCV库
target_link_libraries(${PROJECT_NAME} PRIVATE Qt${QT_VERSION_MAJOR}::Widgets ${OpenCV_LIBS})
# 包含OpenCV的头文件目录
target_include_directories(${PROJECT_NAME} PRIVATE ${OpenCV_INCLUDE_DIRS})
set_target_properties(${PROJECT_NAME} PROPERTIES
MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
MACOSX_BUNDLE OFF
WIN32_EXECUTABLE OFF
)
install(TARGETS ${PROJECT_NAME}
BUNDLE DESTINATION .
LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
if(QT_VERSION_MAJOR EQUAL 6)
qt_finalize_executable(${PROJECT_NAME})
endif()2.3 qDebug cout printf 等输出控制台没反应
修改cmake配置，为OFF
c
MACOSX_BUNDLE OFF
WIN32_EXECUTABLE OFF
3. 测试
c
#include "widget.h"
#include <QLabel>
#include <QVBoxLayout>
#include <qglobal.h>
#include <qimage.h>
#include <qpixmap.h>
#include <QDebug>
QImage Widget::Mat2QImage(cv::Mat mat)
{
switch (mat.type()) {
// 8-bit, 4-channel
case CV_8UC4:
{
QImage image(mat.data, mat.cols, mat.rows, mat.step, QImage::Format_ARGB32);
return image.copy();
}
// 8-bit, 3-channel
case CV_8UC3:
{
QImage image(mat.data, mat.cols, mat.rows, mat.step, QImage::Format_RGB888);
image = image.rgbSwapped(); // OpenCV reads images in BGR, Qt uses RGB
return image.copy();
}
// 8-bit, 1-channel
case CV_8UC1:
{
QImage image(mat.cols, mat.rows, QImage::Format_Grayscale8);
uchar *pSrc = mat.data;
for(int y = 0; y < mat.rows; ++y)
{
memcpy(image.scanLine(y), pSrc, mat.cols);
pSrc += mat.step;
}
return image;
}
default:
return QImage();
}
}
Widget::Widget(QWidget *parent) : QWidget(parent) {
this->setWindowTitle("vscode");
this->resize(500, 400);
QLabel *label = new QLabel(this);
QVBoxLayout *vbox = new QVBoxLayout(this);
vbox->addWidget(label);
qDebug() << "Image load before ========= " ;
// 加载图像
cv::Mat image = cv::imread("C:/Users/ylp/Pictures/壁纸/22.jpeg");
qDebug() << "Image。empty: " << image.empty();
if (!image.empty()) {
QImage qimage = Mat2QImage(image);
label->setPixmap(QPixmap::fromImage(qimage));
}
}
Widget::~Widget() {
}
c
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <qimage.h>
#include <opencv2/opencv.hpp>
#include <opencv2/imgcodecs/imgcodecs.hpp>
class Widget : public QWidget
{
Q_OBJECT
public:
Widget(QWidget *parent = nullptr);
~Widget();
private:
QImage *image;
QImage Mat2QImage(cv::Mat src);
};
#endif
c
#include "widget.h"
#include <QApplication>
#include <QDebug>
int main(int argc, char* argv[]) {
QApplication app(argc, argv);
Widget w;
w.show();
return app.exec();
}运行代码：
测试工程下载： https://download.csdn.net/download/qq_51355375/89610982