opencv 环境相关

拷贝志强服务器的环境需要配置下opencv

(安装opencv的一些依赖项，防止编译不通过)

1. 拷贝的库放在/opt下，改名字为libs-x64.

2. 安装opencv的依赖项

sudo apt-get install build-essential libgtk2.0-dev libgtk-3-dev libavcodec-dev libavformat-dev libjpeg-dev libswscale-dev libtiff5-dev

 3.修改common.pri文件中的路径。

4. 编译通过。

cmake 编译opencv 程序

opencv程序

#include <iostream>
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
using namespace cv;
using namespace std;
int main(int argc, char** argv )
{
    std::cout << "OpenCV version : " << CV_VERSION << std::endl;
    std::cout << "Major version : " << CV_MAJOR_VERSION << std::endl;
    std::cout << "Minor version : " << CV_MINOR_VERSION << std::endl;
    std::cout << "Subminor version :"<<CV_SUBMINOR_VERSION<<std::endl;

    if ( argc != 2 )
    {
        cout<<"usage: DisplayImage.out <Image_Path>\n";
        return -1;
    }
    Mat image;
    image = imread( argv[1], 1 );
    if ( !image.data )
    {
        cout<<"No image data \n";
        return -1;
    }
    namedWindow("Display Image", WINDOW_AUTOSIZE );
    imshow("Display Image", image);
    waitKey(0);
    return 0;
}

志强服务器拷贝的opencv库 CMakeLists(按标准写法有问题)写法：

# cmake needs this line
cmake_minimum_required(VERSION 2.8)

# Enable C++11
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED TRUE)

# Define project name
project(DisplayImage)

# Find OpenCV, you may need to set OpenCV_DIR variable
# to the absolute path to the directory containing OpenCVConfig.cmake file
# via the command line or GUI
set(OpenCV_DIR /opt/libs-x64/opencv/opencv440/lib/cmake/opencv4)#/opt/libs-x64/opencv/opencv420/lib/cmake/opencv4)
find_package(OpenCV REQUIRED)  
message("OpenCV_Include_Dir=${OpenCV_INCLUDE_DIRS}")
include_directories(/opt/libs-x64/opencv/opencv440/include)#${OpenCV_INCLUDE_DIRS} )  #新复制过来的是没有这一行的，自己加的 /opt/libs-x64/opencv/opencv420/include)# 
#link_directories(/opt/libs-x64/opencv/opencv420/lib)
# Declare the executable target built from your sources
add_executable(DisplayImage testOpencv.cpp)

# Link your application with OpenCV libraries
target_link_libraries(DisplayImage ${OpenCV_LIBS})

从牛老师拷贝opencv440库的cmake写法

# cmake needs this line
cmake_minimum_required(VERSION 2.8)

# Enable C++11
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED TRUE)

# Define project name
project(DisplayImage)

# Find OpenCV, you may need to set OpenCV_DIR variable
# to the absolute path to the directory containing OpenCVConfig.cmake file
# via the command line or GUI
set(OpenCV_DIR /opt/libs-x64/opencv440/lib/cmake/opencv4)#/opt/libs-x64/opencv/opencv420/lib/cmake/opencv4)
find_package(OpenCV REQUIRED)  
message("OpenCV_Include_Dir=${OpenCV_INCLUDE_DIRS}")
#include_directories(/opt/libs-x64/opencv/opencv440/include)#${OpenCV_INCLUDE_DIRS} )  #新复制过来的是没有这一行的，自己加的 /opt/libs-x64/opencv/opencv420/include)# 
include_directories(${OpenCV_INCLUDE_DIRS})
#link_directories(/opt/libs-x64/opencv/opencv420/lib)
# Declare the executable target built from your sources
add_executable(DisplayImage testOpencv.cpp)

# Link your application with OpenCV libraries
target_link_libraries(DisplayImage ${OpenCV_LIBS})