树莓派3B+安装openCV3.4

1.检查apt源 （换成国内源）

注释掉原来的源，换成清华大学的源。

nano /etc/apt/sources.list

deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main contrib non-free rpi
deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main contrib non-free rpi

nano /etc/apt/sources.list.d/raspi.list

deb http://mirror.tuna.tsinghua.edu.cn/raspberrypi/ stretch main ui
deb-src http://mirror.tuna.tsinghua.edu.cn/raspberrypi/ stretch main ui

2.更新树莓派

apt update

apt upgrade

3.安装numpy

pip3 install numpy

ps：记一下numpy的安装目录，后面编译时需要

4.扩大TF卡空间

raspi-config

然后选择” Advanced Options “然后选择” Expand Filesystem “然后重启树莓派

5.安装所需库

apt install build-essential git cmake pkg-config -y
apt install libjpeg8-dev -y
apt install libtiff5-dev -y
apt install libjasper-dev -y
apt install libpng12-dev -y
apt install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev -y
apt install libgtk2.0-dev -y
apt install libatlas-base-dev gfortran -y

6.下载OpenCV库和Contrib库

wget https://github.com/Itseez/opencv/archive/3.4.0.zip
wget https://github.com/Itseez/opencv_contrib/archive/3.4.0.zip

unzip后进入opencv-3.4.0文件夹里创建build文件夹，然后cd到此文件夹

7.配置cmake

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D OPENCV_EXTRA_MODULES_PATH=/root/opencv_contrib-3.4.0/modules -D BUILD_EXAMPLES=ON -D WITH_LIBV4L=ON PYTHON3_EXECUTABLE=/usr/bin/python3.5 PYTHON_INCLUDE_DIR=/usr/include/python3.5 PYTHON_LIBRARY=/usr/lib/arm-linux-gnueabihf/libpython3.5m.so PYTHON3_NUMPY_INCLUDE_DIRS=/home/pi/.local/lib/python3.5/site-packages/numpy/core/include ..

注意：路径建议逐条验证，如果不一样就修改为当前系统的路径。

8.编译&&安装

make && make install

本人笔记本跑了十几分钟，树莓派跑了几个小时。。。

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