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  Ubuntu 12.04 installation OpenCV2.4.1 and compile test
  Add Date : 2018-11-21      
  Write on Ubuntu OpenCV application, does have many advantages, although initially configure the environment a little trouble. Now, I OpenCV2.4.1 in Ubuntu 12.04 LTS on environment configuration summarized as follows.

First, the Ubuntu system must first ensure that the system software is up to date for each. Just so

sudo apt-get update
sudo apt-get upgrade

Second, OpenCv will depend on a variety of packages, you need to install the next.

sudo apt-get install build-essential libgtk2.0-dev libjpeg-dev libtiff4-dev libjasper-dev libopenexr-dev cmake python-dev python-numpy python-tk libtbb-dev libeigen2-dev yasm libfaac-dev libopencore-amrnb-dev libopencore-amrwb-dev libtheora-dev libvorbis-dev libxvidcore-dev libx264-dev libqt4-dev libqt4-opengl-dev sphinx-common texlive-latex-extra libv4l-dev libdc1394-22-dev libavcodec-dev libavformat-dev libswscale-dev

Third, it is to download and unzip followed OpenCv

wget http://downloads.sourceforge.net/project/opencvlibrary/opencv-unix/2.4.1/OpenCV-2.4.1.tar.bz2
tar -xvf OpenCV-2.4.1.tar.bz2
cd OpenCV-2.4.1

Of course there are other methods. For example, download the .zip, unzip it directly.

Fourth, then, the new folder and use cmake to compile.

mkdir build
cd build

This ready to compile and install OpenCv

sudo make install

Fifth, the configuration OpenCv.

sudo gedit /etc/ld.so.conf.d/opencv.conf

In the end of the file add / usr / local / lib, and execute

sudo ldconfig

Then open another file and add these lines at the end of

sudo gedit /etc/bash.bashrc

Add Content

PKG_CONFIG_PATH = $ PKG_CONFIG_PATH: / usr / local / lib / pkgconfig

Sixth, and finally you need to restart or log out, to validate the configuration.

Next, the operation of several examples, test OpenCv

Before running the following example, we need to prepare for the next

cd ~ / OpenCV-2.4.1 / samples / c
chmod + x build_all.sh

cd ~ / OpenCV-2.4.1 / samples / c
chmod + x build_all.sh

./facedetect --cascade = "/ usr / local / share / OpenCV / haarcascades / haarcascade_frontalface_alt.xml" --scale = 1.5 lena.jpg

./facedetect --cascade = "/ usr / local / share / OpenCV / haarcascades / haarcascade_frontalface_alt.xml" --nested-cascade = "/ usr / local / share / OpenCV / haarcascades / haarcascade_eye.xml" --scale = 1.5 lena.jpg

The most important thing is how we write OpenCv compiled program.

Below, an example is given. Directly on the code

#include < highgui.h>
#include < iostream>
using namespace std;

int main (int argc, char ** argv)
  IplImage * image = cvLoadImage ( "lena.jpg");
  // If (argc < 2 || image == NULL)
  // {
  // Cout < < "No image data \ n";
  // Return -1;
  cvNamedWindow ( "Display Image", CV_WINDOW_AUTOSIZE);
  cvShowImage ( "Display Image", image);
  cvWaitKey (0);
  cvReleaseImage (& image);
  cvDestroyWindow ( "Display Image");
  return 0;

A brief explanation, pkg-config command requires .pc with a file. opencv is / usr / lib / pkgconfig folder following file is called Oh opencv.pc.

--cflags specified for compilation header files where to look, --libs indicating the connection process so the file where to look.
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