How to compile and install opencv under ubuntu

Easy installation of opencv2:

conda install --channel https://conda.anaconda.org/menpo opencv

or:

sudo apt-get install libopencv-dev python-opencv

Easy installation of opencv3:

pip install opencv-python

or:

pip install opencv-python==3.1.0

The simple installation method is to install the compiled Opencv from the library. This installation method is simple and convenient. The disadvantage is that it is easy to have unknown bugs during use, such as not being able to imshow images, not being able to read video files, etc. (opencv3 seems to be better).

It is recommended to compile and install from source code.

Compile and install Opencv2 or Opencv3 from source code

1. Install dependency files

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

2. Download the source package

Official website download address: https://opencv.org/opencv-3-2.html

Here, choose to download the tar.gz file for all platforms on the GitHub source (download link: https://github.com/opencv/opencv/archive/3.2.0.tar.gz), opencv-3.2.0.tar.gz, file size 75MB

3. Unzip the source code and compile and install

tar xvf opencv-3.2.0.tar.gz
cd opencv-3.2.0
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local ..
make
sudo make install

Note: When executing the cmake command, you need to download a ippicv_linux_20151201.tgz file. If the network is not good, it may get stuck at:

ICV: Downloading ippicv_linux_20151201.tgz...

At this time, you can download the ippicv_linux_20151201.tgz file separately (file size 36.5MB, download link: https://raw.githubusercontent.com/Itseez/opencv_3rdparty/81a676001ca8075ada498583e4166079e5744668/ippicv/ippicv_linux_20151201.tgz), put it in the '/opencv-3.2.0/3rdparty/ippicv/downloads/linux-808b791a6eac9ed78d32a7666804320e/' folder after downloading, and then re-cmake it.

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