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Using OpenCV with gcc and CMake {#tutorial_linux_gcc_cmake}
===============================
@prev_tutorial{tutorial_linux_gdb_pretty_printer}
@next_tutorial{tutorial_linux_eclipse}
| | |
| -: | :- |
| Original author | Ana Huamán |
| Compatibility | OpenCV >= 3.0 |
@warning
This tutorial can contain obsolete information.
@note We assume that you have successfully installed OpenCV in your workstation.
- The easiest way of using OpenCV in your code is to use [CMake](http://www.cmake.org/). A few
advantages (taken from the Wiki):
-# No need to change anything when porting between Linux and Windows
-# Can easily be combined with other tools by CMake( i.e. Qt, ITK and VTK )
- If you are not familiar with CMake, checkout the
[tutorial](http://www.cmake.org/cmake/help/cmake_tutorial.html) on its website.
Steps
-----
### Create a program using OpenCV
Let's use a simple program such as DisplayImage.cpp shown below.
@code{.cpp}
#include <stdio.h>
#include <opencv2/opencv.hpp>
using namespace cv;
int main(int argc, char** argv )
{
if ( argc != 2 )
{
printf("usage: DisplayImage.out <Image_Path>\n");
return -1;
}
Mat image;
image = imread( argv[1], 1 );
if ( !image.data )
{
printf("No image data \n");
return -1;
}
namedWindow("Display Image", WINDOW_AUTOSIZE );
imshow("Display Image", image);
waitKey(0);
return 0;
}
@endcode
### Create a CMake file
Now you have to create your CMakeLists.txt file. It should look like this:
@code{.cmake}
cmake_minimum_required(VERSION 2.8)
project( DisplayImage )
find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )
add_executable( DisplayImage DisplayImage.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBS} )
@endcode
### Generate the executable
This part is easy, just proceed as with any other project using CMake:
@code{.bash}
cd <DisplayImage_directory>
cmake .
make
@endcode
### Result
By now you should have an executable (called DisplayImage in this case). You just have to run it
giving an image location as an argument, i.e.:
@code{.bash}
./DisplayImage lena.jpg
@endcode
You should get a nice window as the one shown below:
|
