Install OpenCV2.4.13 under Ubuntu16.04

Software version

Ubuntu 16.04; OpenCV 2.4.13

installation steps

1. First install some compilation tools

# Install build tools
sudo apt-get install build-essential
# install dependencies
sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
# install optional packages
sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev

2. Download opencv

https://github.com/Itseez/opencv/archive/2.4.13.zip

3. Compile and install

# Open the folder "opencv-2.4.13":
cd opencv-2.4.13
# Create a new folder for temporary files:
mkdir release
# Switch to the temporary folder:
cd release
# Start compiling:
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
make -j4 # Open the thread according to its own configuration
sudo make install

4. System configuration

# Configure the environment and add the opencv library to the path so that the system can find it
sudo gedit /etc/ld.so.conf.d/opencv.conf
# Add /usr/local/lib at the end, save and exit
sudo ldconfig # make the configuration take effect

sudo gedit /etc/bash.bashrc
# add at the end
PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
export PKG_CONFIG_PATH
# save and exit
sudo source /etc/bash.bashrc #Make the configuration take effect
(This step may report an error that the command cannot be found, because the source is the root command)
su # Enter root privileges
enter password
source /etc/bash.bashrc
Ctrl+d #Exit root
sudo updatedb #更新database

test

1. Test the code to display the lena image

//File name lena.cpp
#include <stdio.h>
#include <opencv2/opencv.hpp>
using namespace cv;
int main( )
{
    Mat image;
    image = imread("lena.jpg", 1 );//The directory follows its own directory
    if ( !image.data )
    {
        printf("No image data \n");
        return -1;
    }
    namedWindow("Display Image", WINDOW_AUTOSIZE );
    imshow("Display Image", image);
    waitKey(0);
    return 0;
}

2. Compile

g++ lena.cpp `pkg-config --cflags --libs opencv` -o lena

3. Run in the folder

./lena

https://www.cnblogs.com/eczhou/p/7860586.html