Integrating QT and OpenCV?

Question

I tried integrating QT and OpenCV with the following .pro but I still get errors about linking.

######################################################################
# Automatically generated by qmake (2.01a) Wed Apr 6 17:34:22 2011
######################################################################

TEMPLATE = app
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .
QT+=opengl
# Input
HEADERS += glwidget.h mainwindow.h ui_info.h ui_information.h
FORMS += mainwindow.ui
SOURCES += glwidget.cpp main.cpp mainwindow.cpp
RESOURCES += res.qrc

INCLUDEPATH += /usr/local/include/opencv 
LIBS += /Library/Frameworks/OpenCV/lib

any idea what I can do?

Can you post the errors?

fabmilo
– fabmilo

2011-04-09 18:24:56 +00:00
Commented Apr 9, 2011 at 18:24 — fabmilo
– fabmilo, Commented Apr 9, 2011 at 18:24

Muhammad Anjum Kaiser · Accepted Answer · 2011-04-11 07:38:35Z

1

you are missing library name in this configuration, specify the libs names as following:

LIBS += -L/usr/local/lib -lcv -lhighgui

Library names can change with versions of OpenCV, so you have to look at OpenCV documentation. A simpler method will be to use pkg-config by replacing INCLUDEPATH and LIBS with the following in your project .pro file:

CONFIG += link_pkgconfig
PKGCONFIG += opencv

answered Apr 11, 2011 at 7:38

Muhammad Anjum Kaiser

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newDelete · Accepted Answer · 2012-03-05 23:51:26Z

1

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edited Mar 5, 2012 at 23:51

answered Apr 19, 2011 at 6:08

newDelete

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user152508 · Accepted Answer · 2011-04-07 09:09:35Z

0

try to add the filename of the lib to the path. LIBS += /Library/Frameworks/OpenCV/lib/opencv.lib

answered Apr 7, 2011 at 9:09

user152508

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1 Comment

newDelete Over a year ago

you mean add each of the lib files? e.g. libopencv_highgui.2.2.0.dylib.

IntenseCorona · Accepted Answer · 2018-08-19 05:54:42Z

The EASIEST and most SURE way to link an external library like OpenCV is to use the "Add Library" wizard inside Qt Creator.

The steps listed below are found in the Qt5 documentation: [http://doc.qt.io/qtcreator/creator-project-qmake-libraries.html][1] under the "To Add Library" section.

Right click on the project file located in the 'project pane' on the left side of the creator... and select "Add Library..."
Follow the instructions of the wizard

Let me add some specificity from here...

Select "External Library"
For the "Library File" navigate to your opencv_worldXXX.lib file (or opencv_worldXXXd.lib file, you will notice that by specifying only one or the other the wizard has a checkbox which includes the other automatically) [ex. ...\opencv\build\x64\vc12\lib\opncv_world.lib]
For the "Include Folder" navigate to the "include" folder within the build. [ex. ...\opencv\build\include]
Select your operating system, dynamic/static library (whichever is appropriate)
Hit NEXT, CLEAN UP, and RUN!

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