Ubuntu16.04下編譯安裝OpenCV3.4.0（C++ & python）

Ubuntu16.04下編譯安裝OpenCV3.4.0（C++ & python）

前提是已經安裝了python2，python3

1）安裝各種依賴庫

sudo apt-get update
sudo apt-get install build-essential

sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev

sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev

sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev liblapacke-dev

sudo apt-get install libxvidcore-dev libx264-dev
sudo apt-get install libatlas-base-dev gfortran
sudo apt-get install ffmpeg

2) 下載 opencv 源碼

https://github.com/opencv/opencv/releases
選擇最新（或自己喜歡的）版本，然后減壓

3）編譯安裝

cd ~/opencv-3.4.0
mkdir build
cd build

配置

cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local ..

編譯安裝

make -j4
sudo make install

測試

import cv2
print(cv2.version)

3.4.0

錯誤

IPPICV: Download failed: 28;"Timeout was reached"

1) 下載ippicv_2017u3_lnx_intel64_general_20170822.tgz，結果下載失敗

解決辦法是重復試一下，一般都會下載成功。
如果一直失敗則

1）手動下載ippicv庫
https://github.com/opencv/opencv_3rdparty/pull/22/commits/dfe3162c237af211e98b8960018b564bc209261d

2） 將文件拷貝到opencv-3.4.0同級目錄
3）執行如下命令

 ipp_file=ippicv_2017u3_lnx_intel64_general_20170822.tgz &&
ipp_hash=$(md5sum ../$ipp_file | cut -d" " -f1) &&
ipp_dir=.cache/ippicv                           &&

mkdir -p $ipp_dir &&
cp ../$ipp_file $ipp_dir/$ipp_hash-$ipp_file