How to fix linker error when working with openCV?

Question

Im trying to set up openCV on my mac and work with it in Eclipse with C++. But I think somthing is wrong with the linker. I included all libraries as described here: http://docs.opencv.org/doc/tutorials/introduction/linux_eclipse/linux_eclipse.html

I tried the linker commands g++ and g++ -std=c++11 but get always the same error message:

g++ -L/usr/local/lib -o camera src/Camera.o -lopencv_core -lopencv_ml -
lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_flann -lopencv_imgproc -lopencv_highgui 
Undefined symbols for architecture x86_64:
  "cv::imread(cv::String const&, int)", referenced from:
      _main in Camera.o
ld: symbol(s) not found for architecture x86_64

for the following code:

#include "/usr/local/include/opencv/cv.hpp"
#include "/usr/local/include/opencv2/highgui/highgui.hpp"
#include <iostream>

using namespace cv;
using namespace std;

int main( int argc, char** argv )
{
  Mat image;
  image = imread( argv[1], 1 );

  if( argc != 2 || !image.data )
    {
      printf( "No image data \n" );
      return -1;
    }

  namedWindow( "Display Image", CV_WINDOW_AUTOSIZE );
  imshow( "Display Image", image );

  waitKey(0);

  return 0;
}

if that is opencv3.0, you will need -lopencv_imgcodecs for imread(). also, please do not use absolute path, but #include<opencv2/opencv.hpp> — berak
– berak, Commented May 28, 2015 at 11:13

cedrou · Accepted Answer · 2015-05-28 11:14:54Z

7

imread has been moved in the opencv_imgcodecs library.

Try to add -lopencv_imgcodecs to your linker flags.

answered May 28, 2015 at 11:14

cedrou

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1 Comment

Professor_Dodo Over a year ago

Thanks, somehow I missed this one!

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