前文:

[嵌入式embed][Qt]Qt5.12+Opencv4.x+Cmake4.x_用Qt編譯Windows-Opencv庫
[嵌入式embed][Qt]Qt5.12+Opencv4.x+Cmake4.x_測試Qt編譯的opencv4.x的庫

準備環境

ubuntu20.04

安裝qt-opencv必備庫

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庫

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

編譯opencv庫

其中/opt/opencv 就是我自定義放的位置

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

build成功,開始執行sudo make install

make install 成功

特殊:opencv編譯的include,編譯出來后多嵌套了一層文件夾,手工處理下改為include/opencv2

測試demo

新建項目

用Qt編譯Windows-Opencv庫

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設置 OpenCV 路徑
OPENCV_INSTALL_PATH = /opt/opencv# linux包含頭文件路徑
INCLUDEPATH += $$OPENCV_INSTALL_PATH/include
INCLUDEPATH += $$OPENCV_INSTALL_PATH/include/opencv2# linux添加 OpenCV 庫文件路徑
LIBS += -L$$OPENCV_INSTALL_PATH/lib# linux鏈接需要的 OpenCV 庫（根據項目實際使用的模塊調整）
LIBS += -lopencv_core \-lopencv_imgproc \-lopencv_highgui \-lopencv_imgcodecs \-lopencv_videoio# Default rules for deployment.
qnx: target.path = /tmp/$${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);//展示一張圖片Mat myimage = imread("1.jpg");imshow("Image", myimage);//等待10秒鐘waitKey(10);MainWindow w;w.show();return a.exec();
}

將項目復制到linux目錄中:

qmake
make

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

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Qt項目(linux)+環境安裝包