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Using OpenCV with gcc and CMake {#tutorial_linux_gcc_cmake}
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===============================
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@note We assume that you have successfully installed OpenCV in your workstation.
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- The easiest way of using OpenCV in your code is to use [CMake](http://www.cmake.org/). A few
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advantages (taken from the Wiki):
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-# No need to change anything when porting between Linux and Windows
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-# Can easily be combined with other tools by CMake( i.e. Qt, ITK and VTK )
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- If you are not familiar with CMake, checkout the
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[tutorial](http://www.cmake.org/cmake/help/cmake_tutorial.html) on its website.
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### Create a program using OpenCV
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Let's use a simple program such as DisplayImage.cpp shown below.
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#include <opencv2/opencv.hpp>
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int main(int argc, char** argv )
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printf("usage: DisplayImage.out <Image_Path>\n");
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image = imread( argv[1], 1 );
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printf("No image data \n");
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namedWindow("Display Image", WINDOW_AUTOSIZE );
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imshow("Display Image", image);
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### Create a CMake file
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Now you have to create your CMakeLists.txt file. It should look like this:
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cmake_minimum_required(VERSION 2.8)
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project( DisplayImage )
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find_package( OpenCV REQUIRED )
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include_directories( ${OpenCV_INCLUDE_DIRS} )
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add_executable( DisplayImage DisplayImage.cpp )
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target_link_libraries( DisplayImage ${OpenCV_LIBS} )
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### Generate the executable
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This part is easy, just proceed as with any other project using CMake:
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cd <DisplayImage_directory>
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By now you should have an executable (called DisplayImage in this case). You just have to run it
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giving an image location as an argument, i.e.:
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./DisplayImage lena.jpg
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You should get a nice window as the one shown below:
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![](images/GCC_CMake_Example_Tutorial.jpg)