【openCV】Linux下的openCV搭建

1 依赖项

先下载好相关的依赖项目.确保编译成功。

sudo apt-get install build-essential
sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-22-dev
sudo apt-get install libopencv-dev

2 源码编译

clone 源码,我在gitee上放了一份。但是呢，实际上cmake的时候,部分内容还是会链接到github上。如果某些同学连接不到github的网站,那也没辙。

git clone https://gitee.com/joenero/opencv.git

进入源码目录,创建一个单独文件build

cd opencv
mkdir build
cd build

cmake 一下到/usr/local/目录下

cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local ..

执行编译

sudo make -j8

将make生成的文件下载到系统目录下

sudo make install

3 配置

用vim打开这个文件。因为这些只读文件。有些文本编辑器可能无法强制修改。但是vim是万能的。强制保存命令为 : w ! sudo tee %

sudo vim /etc/ld.so.conf

在打开的文件添加makefile安装路劲

/usr/local/lib

再运行

sudo ldconfig

4示例代码

4.1 cmake

cmakelist.txt添加如下内容

include_directories(/usr/local/include/opencv4/opencv2)
set (OpenCV_LIBS /usr/local/lib)
find_package(OpenCV REQUIRED)
target_link_libraries(helloCV ${OpenCV_LIBS}) #helloCV 工程名字

完整的cmakelist.txt如下:

cmake_minimum_required(VERSION 3.17)
project(myTool)

set(CMAKE_CXX_STANDARD 14)

include_directories(/usr/local/include/opencv4/opencv2)
set (OpenCV_LIBS /usr/local/lib)
find_package(OpenCV REQUIRED)
add_executable(myTool main.cpp)

target_link_libraries(myTool ${OpenCV_LIBS}) #helloCV 工程名字

demon代码如下

#include 
#include 
#include 
using namespace cv;
using namespace std;
int main(int argc,char **argv)
{
    Mat img = imread("../test.jpeg");
 //   cout<
    if(img.empty())
    {
        cout<<"error";
        return -1;
    }
    cout<<"My picture: "<< img.size() <<endl;
    imshow("image",img);
    waitKey();
    return 0;
}

如果出现报错： Gtk-Message: 21:57:35.293: Failed to load module “canberra-gtk-module” 则安装

sudo apt-get install libcanberra-gtk-module

4.2 Qt使用

在.pro文件中添加如下内容,根据个人情况

INCLUDEPATH += /usr/local/include \
                /usr/local/include/opencv4 \

LIBS += /usr/local/lib/libopencv*

出现这个错误，只需要在对应的文件中添加头文件
#include

OpenNCC_View/widget.cpp:330: error: ~~‘cvGetWindowHandle’~~ was not declared in this scope
                 if (!cvGetWindowHandle("OpenNCC"))
                      ^~~~~~~~~~~~~~~~~