How to install two versions of OpenCV under ubuntu?
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Foreword
As in the development and research process of many vision projects, the installation of different versions of OpenCV under the ubuntu system is often involved. Therefore, Xiaofan briefly summarizes the steps of the two versions of OpenCV under the ubuntu system for quick reference when reinstalling the system in the future. If there are any shortcomings, please criticize and correct.
A download of OpenCV source code
The OpenCV version we chose to install in this article is OpenCV3.3.1. The source code download link can be obtained by following the WeChat official account "3D Vision Workshop" and replying to "OpenCV3.3.1_linux" in the background to get the download link of the installation package.
Second, check the currently installed OpenCV version
Open the terminal and enter the following command to view the currently installed version of OpenCV.
$ pkg-config --modversion opencv
It can be found that the path of our current version of OpenCV installation is: /usr/local/include
Next, we want to install OpenCV3.3.1 in our own newly created folder directory /home/yongqi/workspace/2_ProgramFiles/OpenCV3.3.1, so how do we operate?
Three start to install OpenCV
In the preface, we explained how to obtain the source code installation package of OpenCV3.3.1. After downloading and decompressing, we can install it as follows:
step-1：$ cd ***/opencv-3.3.1//To opencv-3.3.Step under the unzipped directory of 1-2：$ mkdir buildstep-3：$ cmake -D CMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/home/yongqi/workspace/2_ProgramFiles/OpenCV3.3.1 .. //Note here..Don't forget step-4：$ make -j8step-5：sudo make install -j6
In this way, opencv3.3.1 will be installed in the directory you specify.
Four configure OpenCV environment
Next, we also need to configure some environment variables of OpenCV.
step-1:gedit ~/.bashrcstep-2:Write it down and add the following at the end of the above opened file: export PKG_CONFIG_PATH=/home/yongqi/workspace/2_ProgramFiles/OpenCV3.3.1/lib/pkgconfigexport LD_LIBRARY_PATH=/home/yongqi/workspace/2_ProgramFiles/OpenCV3.3.1/After lib is saved and executed: step-3:$ source ~/.bashrc
Next, configure the lib path of OpenCV
step-1: $ cd /etc/ld.so.conf.dstep-2: $ sudo gedit opencv.confstep-3:Opencv opened above.Write opencv3 in conf.3.1 lib path/home/yongqi/workspace/2_ProgramFiles/OpenCV3.3.1/libstep-4: $ sudo ldconfig
Five test the current version of OpenCV
step-1: $ pkg-config --modversion opencvstep-2: $ pkg-config --cflags opencvstep-3: $ pkg-config --libs opencv
Through the above, we can see that OpenCV in the system has become OpenCV 3.3.1 version.
**Remarks: **
If you still want to use the original OpenCV2.4.9, just modify the fourth step to the pkgconfig path of OpenCV2.4.9.
Reference blog post:
https://blog.csdn.net/c20081052/article/details/87911559
If the above content infringes copyright, please contact the author and the article will be deleted.
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