main.cpp:-1: error: undefined reference to `cvLoadImage'

Question

I want to compile easy programm in qt creator, but I have problems with opencv. Os- ubuntu 16.04 .pro file qt

LIBS += -lopencv_core -lopencv_imgproc -lopencv_highgui

Main program

#include <opencv/cv.h>
#include <opencv/highgui.h>
#include <stdlib.h>
#include <stdio.h>

IplImage* image = 0;
IplImage* src = 0;

int main()
{
    char* filename = "Image0.jpg";
    image = cvLoadImage(filename,1);
    src = cvCloneImage(image);
    return 0;
}

Compilation error main.cpp:-1: error: undefined reference to `cvLoadImage'. What I am doing wrong?

What if you replace LIBS += ... with PKGCONFIG += opencv? — jpnurmi
– jpnurmi, Commented Jul 11, 2016 at 21:15
Since this is a QtCreator issue and has nothing at all to do with the Qt framework (not sure Qt is even used), I changed the tags. — drescherjm
– drescherjm, Commented Jul 11, 2016 at 21:18
PKGCONFIG += opencv didnt help. There is problem only with "cvLoadImage". Program compile normal,if i have remove this comand: char* filename = "Image0.jpg"; src = cvCloneImage(image) — djkah11
– djkah11, Commented Jul 11, 2016 at 21:23

Community · Accepted Answer · 2017-05-23 11:44:10Z

1

It seems you're not linking against the OpenCV libraries correctly (or for some reason the linking is not working), the code itself is compiling.

Take a look at the answers to a similar question, that will most probably help you.

And by the way, cvLoadImage and IplImage are from the old C-API, avoid those. Use cv::Mat img=cv::imread("img.png"), instead.

edited May 23, 2017 at 11:44

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answered Jul 11, 2016 at 22:09

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