OpenCV 安装方法--From Ubuntu documentation

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　　INTRODUCTION:

　　OpenCV (open source computer vision) is>
　　OpenCV is the most popular and advanced code library for Computer Vision>　　INSTALLATIONMany people are having problem with installing OpenCV even from Ubuntu Software Centre. Here a simple .sh script file get all dependancy files from internet and compile the source finally install opencv on your system. So that users can easily write their CV files from C,C++, and Python.
　　Step1:
　　Download the latest opencv.sh from https://github.com/jayrambhia/Install-OpenCV/blob/master/Ubuntu/or Copy the following script to gedit and save as opencv.sh
version="$(wget -q -O - http://sourceforge.net/projects/opencvlibrary/files/opencv-unix | egrep -m1 -o '\"[0-9](\.[0-9])+' | cut -c2-)"　　
echo "Installing OpenCV" $version
　　
mkdir OpenCV
　　
cd OpenCV
　　
echo "Removing any pre-installed ffmpeg and x264"
　　
sudo apt-get -qq remove ffmpeg x264 libx264-dev
　　
echo "Installing Dependenices"
　　
sudo apt-get -qq install libopencv-dev build-essential checkinstall cmake pkg-config yasm libtiff4-dev libjpeg-dev libjasper-dev libavcodec-dev libavformat-dev libswscale-dev libdc1394-22-dev libxine-dev libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev libv4l-dev python-dev python-numpy libtbb-dev libqt4-dev libgtk2.0-dev libfaac-dev libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev libtheora-dev libvorbis-dev libxvidcore-dev x264 v4l-utils ffmpeg
　　
echo "Downloading OpenCV" $version
　　
wget -O OpenCV-$version.tar.gz http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/$version/opencv-"$version".tar.gz/download
　　
echo "Installing OpenCV" $version
　　
tar -xvf OpenCV-$version.tar.gz
　　
cd opencv-$version
　　
mkdir build
　　
cd build
　　
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON ..
　　
make -j 4
　　
sudo make install
　　
sudo sh -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'
　　
sudo ldconfig
　　
echo "OpenCV" $version "ready to be used"
Step 2
　　Open terminal. $ chmod +x opencv.sh $ ./opencv.sh
　　This will complete opencv installation
Running OpenCV
Python
Loading an image in Python
切换行号显示 1 fromcv2.cvimport * 2  3 img = LoadImage("/home/USER/Pictures/python.jpg") 4 NamedWindow("opencv") 5 ShowImage("opencv",img) 6 WaitKey(0) 7 　　$ python filename.py
in C
　　=== Loading an image file in C ==
#include　　
#include<opencv2/highgui/highgui.hpp>
　　
int main()
　　
{
　　
    IplImage* img = cvLoadImage("/home/USER/Pictures/python.jpg",CV_LOAD_IMAGE_COLOR);
　　
    cvNamedWindow("opencvtest",CV_WINDOW_AUTOSIZE);
　　
    cvShowImage("opencvtest",img);
　　
    cvWaitKey(0);
　　
    cvReleaseImage(&img);
　　
    return 0;
　　
}
　　To compile C program, Let’s assume the file is opencvtest.c
　　$ gcc -ggdb pkg-config --cflags opencv -o basename opencvtest.c .c opencvtest.c pkg-config --libs opencv$ ./opencvtest
In C++
　　=== Loading an image file in C++ ==
#include<opencv2/highgui/highgui.hpp>　　
using namespace cv;
　　
int main()
　　
{
　　
    Mat img = imread("/home/USER/Pictures/python.jpg",CV_LOAD_IMAGE_COLOR);
　　
    imshow("opencvtest",img);
　　
    waitKey(0);
　　
    return 0;
　　
}
　　to compile in C++ $ g++ -ggdb pkg-config --cflags opencv -o basename opencvtest.cpp .cpp opencvtest.cpp pkg-config --libs opencv$ ./opencvtest
　　Note: Always include OpenCV header files in C and C++ as
#include "opencv2/core/core_c.h"　　
#include "opencv2/core/core.hpp"
　　
#include "opencv2/flann/miniflann.hpp"
　　
#include "opencv2/imgproc/imgproc_c.h"
　　
#include "opencv2/imgproc/imgproc.hpp"
　　
#include "opencv2/video/video.hpp"
　　
#include "opencv2/features2d/features2d.hpp"
　　
#include "opencv2/objdetect/objdetect.hpp"
　　
#include "opencv2/calib3d/calib3d.hpp"
　　
#include "opencv2/ml/ml.hpp"
　　
#include "opencv2/highgui/highgui_c.h"
　　
#include "opencv2/highgui/highgui.hpp"
　　
#include "opencv2/contrib/contrib.hpp"
　　A bash script to compile opencv programs.Making a Bash Script to Compile OpenCV:
　　It’s kind of boring typing all this stuff. So, A bash file to compile OpenCV programs. Name it .compile_opencv.sh and keep it in your home directory.
echo "compiling $1"　　
if [[ $1 == *.c ]]
　　
then
　　
    gcc -ggdb `pkg-config --cflags opencv` -o `basename $1 .c` $1 `pkg-config --libs opencv`;
　　
elif [[ $1 == *.cpp ]]
　　
then
　　
    g++ -ggdb `pkg-config --cflags opencv` -o `basename $1 .cpp` $1 `pkg-config --libs opencv`;
　　
else
　　
    echo "Please compile only .c or .cpp files"
　　
fi
　　
echo "Output file => ${1%.*}
　　Add an alias in .bashrc or .bash_aliases
　　alias opencv="~/.compile_opencv.sh"
　　$ opencv opencvtest.c $ ./opencvtest