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How to compile basic opencv program in C++ in ubuntu

asked 2013-12-18 09:18:13 -0500

kchaitu gravatar image

updated 2013-12-18 23:26:20 -0500

I have installed opencv in ubuntu 12.04. I have written a basic program in c++. How to compile this basic program in C++ using opencv libraries.

#include <cv.h>
#include <highgui.h>


int main(){

    Mat image;
    image = imread("google.jpg", CV_LOAD_IMAGE_UNCHANGED);   // Read the file

    if(! image.data )                              // Check for invalid input
    {
        cout <<  "Could not open or find the image" << std::endl ;
        return -1;
    }

    namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display.
    imshow( "Display window", image );                   // Show our image inside it.

    waitKey(0);   

      return 0;
}
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answered 2013-12-19 07:04:32 -0500

Haris gravatar image
  • Using command line

Use below command to build binary from your source file directory.

g++ -I/usr/local/include/opencv -I/usr/local/include/opencv2 -L/usr/local/lib/ -g -o binary  main.cpp -lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_contrib -lopencv_legacy -lopencv_stitching

where

binary -> The binary file to be created.

main.cpp -> Source file.

Note: Instead for running all these command every time, just create a file named build.sh , put the above command to it and change the file permission to executable by running chmod 777 build.sh, and from next time run this file instead of running the whole command.

  • Using Camke

See OpenCV Documentation about OpenCV with gcc and CMake

  • Using Eclipse

See OpenCV Documentation about OpenCV with Eclipse (plugin CDT)

  • Using CodeBlocks
  1. Open CodeBlocks and create new C++ project.

  2. Now right click on your project->Buid Options.

  3. On the po-up window select Search directories tab

    -> In that select Compiler tab and add OpenCV include directory, usually /usr/local/include

Screen shot:-

image description

-> Now open Linker tab and set OpenCV bin directory, usually /usr/local/bin

Screen shot:-

image description

4.Finally Open Linker setting tab and on Other linker options add below libraries

-lopencv_calib3d
-lopencv_contrib
-lopencv_core
-lopencv_features2d
-lopencv_flann
-lopencv_highgui
-lopencv_imgproc
-lopencv_legacy
-lopencv_ml
-lopencv_nonfree
-lopencv_objdetect
-lopencv_photo
-lopencv_stitching
-lopencv_superres
-lopencv_ts
-lopencv_video
-lopencv_videostab

Screen shot:-

image description

Done !

Now click ok and build your project.

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Comments

Say I have a C++ class defined in example.h and example.cpp that uses opencv. How do I generate a .o file for this class so I can use it together with other .o files to generate an executable file?

pauloeddias gravatar imagepauloeddias ( 2015-12-09 15:20:40 -0500 )edit
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Asked: 2013-12-18 09:18:13 -0500

Seen: 82,689 times

Last updated: Dec 19 '13