I'm new to Qt and I have a project that needs to configure OpenCV in Qt , I tried to run a simple code in Qt but I got this error "undefined reference to cv::imread(std::string const&, int)
" and here is my code...
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
using namespace cv;
int main(){
Mat src,gray;
src=imread("C:/Users/user/Desktop/wood-pattern.png",1);
imshow("gg",src);
cvWaitKey(0);
return 0;
}
and my source.pro is
#-------------------------------------------------
#
# Project created by QtCreator 2014-08-24T20:38:56
#
#-------------------------------------------------
INCLUDEPATH += C:\opencv\opencv2.4.9\build\include\
CONFIG(release,debug|release)
{
LIBS += C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_calib3d249.lib \
C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_contrib249.lib \
C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_core249.lib \
C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_features2d249.lib \
C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_flann249.lib \
C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_gpu249.lib \
C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_highgui249.lib \
C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_imgproc249.lib \
C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_legacy249.lib \
C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_ml249.lib \
C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_objdetect249.lib \
C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_ts249.lib \
C:\opencv\opencv2.4.9\build\x86\vc11\lib\opencv_video249.lib
}
CONFIG(debug,debug|release)
{
LIBS += C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_calib3d249.lib \
C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_contrib249.lib \
C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_core249.lib \
C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_features2d249.lib \
C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_flann249.lib \
C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_gpu249.lib \
C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_highgui249.lib \
C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_imgproc249.lib \
C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_legacy249.lib \
C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_ml249.lib \
C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_objdetect249.lib \
C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_ts249.lib \
C:\opencv\opencv2.4.9\build\x64\vc11\lib\opencv_video249.lib \
}
QT += core
QT -= gui
TARGET = Source
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp
I saw all the answers about but they didn't work. my Qt is 32bit and my Windows is 64bit. I think my configuration is wrong. I followed many tutorial but they weren't for OpenCV 2.4.9 so please help me ...
See output of pkg-config opencv --libs
to find out what libraries you're missing, then add them to your config.
For me, the full list of libraries is
/usr/lib64/libopencv_calib3d.so.2.4.8
/usr/lib64/libopencv_contrib.so.2.4.8
/usr/lib64/libopencv_core.so.2.4.8
/usr/lib64/libopencv_features2d.so.2.4.8
/usr/lib64/libopencv_flann.so.2.4.8
/usr/lib64/libopencv_gpu.so.2.4.8
/usr/lib64/libopencv_highgui.so.2.4.8
/usr/lib64/libopencv_imgproc.so.2.4.8
/usr/lib64/libopencv_legacy.so.2.4.8
/usr/lib64/libopencv_ml.so.2.4.8
/usr/lib64/libopencv_nonfree.so.2.4.8 # you don't have this one
/usr/lib64/libopencv_objdetect.so.2.4.8
/usr/lib64/libopencv_photo.so.2.4.8 # this one
/usr/lib64/libopencv_stitching.so.2.4.8 # this one
/usr/lib64/libopencv_superres.so.2.4.8 # and this one
/usr/lib64/libopencv_ts.a
/usr/lib64/libopencv_video.so.2.4.8
No idea about Windows, but if it has pkg-config
, you should be able to get QMake to use it automatically by adding
PKGCONFIG += opencv
to your project file (assuming that your OpenCV installs the correct package-config files as it does on sane platforms).
In my case it was solely the order of parameters, note that
g++ main.cpp -o main `pkg-config --libs --cflags opencv`
works while
g++ -o main `pkg-config --libs --cflags opencv` main.cpp
doesn't since the latter defines what main.cpp
needs before main.cpp
is referenced.
I don't use the Qt-creator , I use Vim instead .So i created my own commands that work just fine . this is my cv2run custom command content :
#!/bin/bash
file=$@
if [ "${file: -4}" = ".cpp" ]; then
g++ $file -I/opt/robots/pepper/ctc-linux64-atom-2.5.10.7/opencv2/include/ -L/opt/robots/pepper/ctc-linux64-atom-2.5.10.7/opencv2/lib -lopencv_core -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_videoio
if $status ; then
./a.out && rm -rf a.out
fi
else
echo "This Command should be used only with cpp files that uses the opencv library !!"
fi
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