在macOS安装OpenCV以及VScode的设置

总结一下这两天在macOS上装OpenCV的血泪史

Requirement

  1. Xcode
  2. VScode
  3. OpenCV官网下载最新版source file
  4. brew install cmake

编译OpenCV的source file

cd到opencv-4.0.1文件夹下（目前最新版是4.0.1）

mkdir build用于存放后面生成的文件

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cd build 
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local .. #会生成一堆文件在build文件夹以及/usr/local文件夹
make # compile
sudo make install

这时候OpenCV已经安装好了

VScode配置

Demo cpp如下：

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#include <stdio.h>
#include <opencv2/opencv.hpp>
#include <chrono>
#include <thread>

using namespace cv;
int main(int argc, char** argv )
{
    printf("HEllo World!\n");
    if ( argc != 2 )
    {
        printf("usage: DisplayImage.out <Image_Path>\n");
        return -1;
    }
    printf("%s\n", argv[1]);
    Mat image = imread( argv[1], 1 );
    if ( !image.data )
    {
        printf("No image data \n");
        return -1;
    }
    namedWindow("Display Image", WINDOW_AUTOSIZE );
    imshow("Display Image", image);
    waitKey(0);
    std::this_thread::sleep_for(std::chrono::milliseconds(10000));
    return 0;
}

配置c_cpp_properties.json：增加opencv安装位置的路径

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"includePath": [
                "${workspaceFolder}/**",
                "/usr/local/include/opencv4"
            ]

这时候code里面就可以用opencv的代码提示了

用cmake compile程序

在main.cpp所在目录新建一个文件CMakeLists.txt，指定编译时需要用的库

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cmake_minimum_required(VERSION 3.13.4)
set(CMAKE_CXX_STANDARD 11) //c++标准 cv4需要c11
set(CMAKE_CXX_STANDARD_REQUIRED ON)
project( CV ) //自定义project名称为CV
find_package( OpenCV REQUIRED ) //搜索opencv库
include_directories( ${OpenCV_INCLUDE_DIRS} ) //include opencv
add_executable( CV main.cpp ) //生成的可执行命令，自定义为CV
target_link_libraries( CV ${OpenCV_LIBS} )

然后

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mkdir build #可自定义
cd build
cmake ..

这时候已经vscode全部配置好了

Usage

cpp代码写好之后，在build文件夹里面执行make就会编译cpp文件了。

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-- Configuring done
-- Generating done
-- Build files have been written to: /Users/T5eng/Desktop/CV/build
Scanning dependencies of target CV
[ 50%] Building CXX object CMakeFiles/CV.dir/main.cpp.o
[100%] Linking CXX executable CV
[100%] Built target CV

这时候会生成一个可执行命令CV

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./CV <image-path>

如无意外，会输出一个hello world同时显示图片。

大功告成