Ubuntu 16.04+Python3.5.2安装opencv3.3

之前在Python2.7的环境下安装了opencv，后来切换到Python3.5.2了，opencv需要重新安装，Mark一下安装方法

1. 安装依赖项

sudo apt-get install build-essential cmake pkg-config
sudo apt-get install libjpeg8-dev libtiff5-dev libjasper-dev libpng12-dev
 
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
sudo apt-get install libxvidcore-dev libx264-dev
 
sudo apt-get install libgtk-3-dev
 
sudo apt-get install libatlas-base-dev gfortran
 
sudo apt-get install python3.5-dev
sudo apt-get install python3-numpy

2. opencv编译

到官网https://opencv.org/releases.html下载要安装的opencv源码，解压后，cd进入opencv主目录，建立build文件夹

cd /home/zyl/Documents/Program/opencv-3.3.0/

mkdir build

cd build

编译准备

cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D PYTHON3_EXECUTABLE=/usr/bin/python3 \
-D PYTHON_INCLUDE_DIR=/usr/include/python3.5 \
-D PYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython3.5m.so \
-D PYTHON3_NUMPY_INCLUDE_DIRS=/usr/lib/python3/dist-packages/numpy/core/include/ ..

这里最后一行numpy的目录可能有些人要改为

/usr/local/lib/python3.5/dist-packages/numpy/core/include/

这里可以自行去两个目录找一下，能在哪里找到numpy就用哪个，我这里numpy对应的目录是/usr/lib/python3/dist-packages/numpy/core/include/

编译：

make -j6

sudo make install

最后make install 会报错没有权限复制文件进去某个文件夹，因此这里采用了sudo make install

4. 验证是否安装成功

python

import cv2

cv2.__version__

没有报错，并输出3.3.0则说明安装成功

5. 如果想卸载opencv：

首先通过终端进入之前建立的build文件夹，接着开始卸载：

sudo make uninstall

接着删除一些文件：

cd ../

sudo rm -r build

sudo rm -r /usr/local/include/opencv2 /usr/local/include/opencv /usr/include/opencv /usr/include/opencv2 /usr/local/share/opencv /usr/local/share/OpenCV /usr/share/opencv /usr/share/OpenCV /usr/local/bin/opencv* /usr/local/lib/libopencv*

有些文件可能提示没有，可以忽略。

最后删除一些依赖：

sudo apt-get remove opencv-doc opencv-data python-opencv