前文:

[嵌入式embed][Qt]Qt5.12+Opencv4.x+Cmake4.x_用Qt编译Windows-Opencv库
[嵌入式embed][Qt]Qt5.12+Opencv4.x+Cmake4.x_测试Qt编译的opencv4.x的库

准备环境

ubuntu20.04

安装qt-opencv必备库

sudo apt install build-essential cmake libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
sudo apt install openjdk-11-jdk python3 python3-pip

git-clone opencv库

git clone https://github.com/opencv/opencv

编译opencv库

其中/opt/opencv 就是我自定义放的位置

cd opencv
mkdir build && cd build
cmake -D CMAKE_INSTALL_PREFIX=/opt/opencv ..
make -j4
sudo make install

build成功,开始执行sudo make install

make install 成功

特殊:opencv编译的include,编译出来后多嵌套了一层文件夹,手工处理下改为include/opencv2

测试demo

新建项目

用Qt编译Windows-Opencv库

QOpencv3.pro

QT       += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++11# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \mainwindow.cppHEADERS += \mainwindow.hFORMS += \mainwindow.ui# linux设置 OpenCV 路径
OPENCV_INSTALL_PATH = /opt/opencv# linux包含头文件路径
INCLUDEPATH += $$OPENCV_INSTALL_PATH/include
INCLUDEPATH += $$OPENCV_INSTALL_PATH/include/opencv2# linux添加 OpenCV 库文件路径
LIBS += -L$$OPENCV_INSTALL_PATH/lib# linux链接需要的 OpenCV 库（根据项目实际使用的模块调整）
LIBS += -lopencv_core \-lopencv_imgproc \-lopencv_highgui \-lopencv_imgcodecs \-lopencv_videoio# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

main.cpp

#include "mainwindow.h"#include <QApplication>
#include <opencv.hpp>
using namespace cv;//opencv4.x版本
int main(int argc, char *argv[])
{QApplication a(argc, argv);//展示一张图片Mat myimage = imread("1.jpg");imshow("Image", myimage);//等待10秒钟waitKey(10);MainWindow w;w.show();return a.exec();
}

将项目复制到linux目录中:

qmake
make

export LD_LIBRARY_PATH=/opt/opencv/lib:$LD_LIBRARY_PATH & ./QOpencvV3
运行成功

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Qt项目(linux)+环境安装包