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Asked: 2026-06-04T15:41:13+00:00

I’ve been working on a simple Qt C++ OpenCV app and I want to

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I’ve been working on a simple Qt C++ OpenCV app and I want to integrate a Kalman filter.
I include:

opencv/cv.h;opencv/highgui.h and opencv/cxcore.h;

in my .pro file I have:

INCLUDEPATH += -I/usr/include/opencv LIBS += -lopencv_core \
-lopencv_highgui \
-lopencv_imgproc

However, when I do this CvKalman* kalman = cvCreateKalman(8,4,0); I just get undefined reference to cvCreateKalman and collect2: ld returned 1 exit status. Compile output doesn’t provide additional info.

I tried finding help online but Google wasn’t really helpful. I also tried to include additional OpenCV libs like ml or object tracking but nothing happened.

It seems a bit weird to me that CvKalman and cvCreateKalman are available in the autocomplete since right after loading the original libs…

Any help would be greatly appreciated!
Thanks.

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1 Answer

  1. Editorial Team

    In INCLUDEPATH, Specify your library like this,

    INCLUDEPATH += /usr/include/opencv

    And add the modules to LIBS vaiable like this,

    LIBS += -L/usr/lib -lopencv_core -lopencv_highgui  -lopencv_imgproc

    This should work.

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