Opencv Linux

1. Get sourcecode download OpenCV_xx.tar

   tar xvf ~/Downloads/OpenCV-2.3.1a.tar.bz2

   cd  OpenCV-2.3.1

 #sudo apt-get installbuild-essential libgtk2.0-dev libavcodec-dev libavformat-dev libjpeg62-dev libtiff4-dev cmake libswscale-dev libjasper-dev

 #./configure在opencv 2.1之后不再采用，可以使用cmake去配置config

 # svn co https://code.ros.org/svn/opencv/trunk 

2. configure opencv Cmake&&GCC

For example, if you downloaded the project to ~/projects/opencv, you can do the following:

•    cd ~/projects/opencv # the directory containing INSTALL, CMakeLists.txt etc.
     mkdir release
     cd release
     cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_PYTHON_SUPPORT=ON ..

Note： ..上一级目录

3. compile using gcc

 cd release

 make install

    notes:

       3.1 download ffmpeg and build

             svn co svn://svn.mplayerhq.hu//ffmpeg/trunk ffmpeg

             ./configure --enable-shared --disable-yasm

              make

             sudo make install

Now you have to configure the library. First, open the opencv.conf file with the following code:

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

Add the following line at the end of the file(it may be an empty file, that is ok) and then save it:

/usr/local/lib

Run the following code to configure the library:

sudo ldconfig

Now you have to open another file:

sudo gedit /etc/bash.bashrc

Add these two lines at the end of the file and save it:

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

export PKG_CONFIG_PATH

4. Test example

  g++ `pkg-config opencv --libs --cflags opencv` drawing.c -o drawing
Note: 1.  ``这里不是分号，而是数字1键左边的符合。

          2.   sudo apt-get install libgtk2.0-dev pkg-config

build_all.sh

#!/bin/sh


if [ $# -gt 0 ] ; then
        base=`basename $1 .c`
        echo "compiling $base"
        gcc -ggdb `pkg-config opencv --cflags --libs` $base.c -o $base
else
        for i in *.c; do
            echo "compiling $i"
            gcc -ggdb `pkg-config --cflags opencv` -o `basename $i .c` $i `pkg-config --libs opencv`;
        done
        for i in *.cpp; do
            echo "compiling $i"
            g++ -ggdb `pkg-config --cflags opencv` -o `basename $i .cpp` $i `pkg-config --libs opencv`;
        done
fi

 

（原）error while loading shared libraries解决方法

撰写于 2012 年 04 月 01 日 | 分类 :Opencv | 7 条评论

今天第二次在ubuntu下配置opencv的开发环境，编译程序时出现error while loading shared libraries: libopencv_core.so.2.3: cannot open shared object file: No such file or directory的错误。

原因：出现这类错误表示，系统不知道xxx.so放在哪个目录下，这时候就要在/etc/ld.so.conf中加入xxx.so所在的目录。

解决方法：在/etc/ld.so.conf中加入/usr/local/lib这一行，保存之后，再运行：/sbin/ldconfig –v更新一下配置即可。

终端里运行：sudo vi /etc/ld.so.conf
加入：/usr/local/lib这一行
保存，退出，终端里运行：sudo /sbin/ldconfig -v

这样，就可以编译了！