MacOS安装ncnn和OpenCV
你已经学会安装ncnn和opencv来打开图片识别目标了，下面去拯救公主吧！🐛🦆
安装腾讯ncnn
参考：https://github.com/Tencent/ncnn/wiki/how-to-build#build-for-macos
安装完成后，在bashrc导入：
# ncnn_install
PATH="/Users/sjl/learn/ncnn/build/install/bin":"$PATH"
PATH="/Users/sjl/learn/ncnn/build/examples":"$PATH"下载model，建议压缩包
git clone git@github.com:nihui/ncnn-assets.git到models路径下
yolov3 test.jpeg安装opencv
下载安装包
cd opencv-3.4.16
mkdir build
cd build
cmake-gui
make -j32
sudo make install
opencv2_version