macOS Sierra上Opencv的安装与使用

安装cmake  
brew install cmake    
安装OpenCV  
 brew install opencv  
//opencv升级  
# brew upgrade opencv    
配置OpenCV环境: vi /etc/profile添加
       

PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/Cellar/opencv/3.4.1_2/lib/pkgconfig 

export PKG_CONFIG_PATH  

export LD_LIBRARY_PATH=/usr/local/Cellar/opencv/3.4.1_2/bin:SLD_LIBRARY_PATH  

export PATH=${PATH}:/usr/local/Cellar/opencv/3.4.1_2/lib 

执行:source /etc/profile  
重启电脑  
  
4.测试demo  
<1>.test.cpp  
   #include <opencv2/highgui.hpp>  
#include <opencv2/opencv.hpp>  
  
using namespace cv;  
  
int main(int argc, char** argv)  
{     
  //加载图片路径  
  Mat img = imread("moon.jpeg", CV_LOAD_IMAGE_UNCHANGED);  
  
  if(img.empty())  
  {  
    fprintf(stderr, "请输入正确的图片路径
");  
    return -1;  
  }  
  
  Mat gray;  
  cvtColor(img,gray,CV_BGR2GRAY);  
    
  //jpeg格式转换为png格式图片  
  if( ! imwrite("image_copy.png", img) )  
  {  
    fprintf(stderr, "转换写入图片失败.
");  
  }  
  
  imshow("显示图片", img);  
  waitKey(0);  
  
  return 0;  
}  
  
<2>.Makefile 注意：第2行和第4行开头是 Tab键，不是空格键。  
test:test.cpp  
    g++ -o test test.cpp `pkg-config --libs opencv` `pkg-config --cflags opencv`   
  
clean:  
    rm test