OpenCV——Install in Linux OS

1. download and install some dependences below first

BRIEF OPERATION

• [common when you have a stable net invironment]

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

• [compiler] sudo apt-get install build-essential
• [required] sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
• [optional] sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev

2. then download opencv3.2.zip && ippicv_linux_20151201.tgz(search on baidu,which will be used soon)

3. make a new folder named ‘build’ and then cd into it

4. run below command to develop and generate

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

5. just makesudo make -j4

j4 means make by 4 thread,which can accelarates your process.The number of thread takes from your PC’s hardware.

Maybe you will meet problems when you make,if so,please run a step4-alike command:

sudo cmake -D CMAKE_BUILD_TYPE=RELEASE -D WITH_EIGEN=OFF -DCMAKE_INSTALL_PREFIX = /usr/local/opencv/3.20 ..

6. just make install

sudo make install

7. after those above,you have done all of work in thory.Then you can find and test your mechine by a simple example like shown:

#include <opencv2/opencv.hpp>

using namespace cv;
int main()
{
    Mat srcImage = imread("test.png");
    namedWindow("test");
    imshow("test",srcImage);
    waitKey(0);
    return 0;
}

8.compile and run the test

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

9.DeError

if you don’t be warning for errors while compiling but running,then you must follow me

//opoen the configuration file
sudo gedit /etc/ld.so.conf
//add a new line
 /usr/loacal/lib
 //update configuration
 sudo ldconfig
 //open an another anyway file
 sudo gedit /etc/bash.bashrc
 //add lines as below following the present part
 PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
    export PKG_CONFIG_PATH
 //then update the contains
 source /etc/bash.bashrc

then you have done what you can do best and your machine can run normally in most cases