Ask Your Question
0

[Ubuntu 18.04] how add opencv built from source to QT applications

asked 2019-01-15 04:55:41 -0500

mikeitexpert gravatar image

updated 2019-01-15 04:56:15 -0500

I have built opencv 4 from source and I would like to add it to my QT5 application.

source folder: /home/mike/opencv-4.0.1/ build folder: /home/mike/opencv-4.0.1/build/

I tried to define the below opencv.pri file to keep things organized but I get so many no such file or directory for included files in the source.

Any clue is much appreciate it.

here is the pri file:

INCLUDEPATH += -I/home/mike/opencv-4.0.1/include
LIBS += -L/home/mike/opencv-4.0.1/build -lopencv_core -lopencv_imgcodecs -lopencv_highgui -lopencv_shape -lopencv_videoio -lopencv_calib3d -lopencv_face

and here is the pro file.

#-------------------------------------------------
#
# Project created by QtCreator 2019-01-01T16:34:40
#
#-------------------------------------------------

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets


include(/home/mike/opencv-4.0.1/opencv.pri)

TARGET = OpticalMeasure
TEMPLATE = app

QT += core gui xml xmlpatterns
QT += multimedia multimediawidgets
QT += concurrent widgets



# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

CONFIG += c++11

LD_LIBRARY_PATH=/home/mike/Qt5.12.0/5.12.0/gcc_64/lib

#INCLUDEPATH += /usr/include/opencv

#LIBS += -L/usr/lib/x86_64-linux-gnu/ -lopencv_core -lopencv_imgcodecs -lopencv_highgui
#LIBS += -L/usr/local/lib -lopencv_shape -lopencv_videoio
#-lopencv_core -lopencv_imgcodecs -lopencv_highgui -lopencv_shape -lopencv_videoio -lopencv_calib3d -lopencv_face
LIBS += -L/home/mike/Qt5.12.0/5.12.0/gcc_64/lib


SOURCES += \
        main.cpp \
        mainwindow.cpp \
    utils/settings.cpp \
    utils/utils.cpp \
    workerthread.cpp \
    camera_calibration.cpp

HEADERS += \
        mainwindow.h \
    utils/constants.h \
    utils/settings.h \
    utils/utils.h \
    workerthread.h

FORMS += \
        mainwindow.ui \
    videosettings.ui \
    imagesettings.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

RESOURCES += \
    resources.qrc \
    camera.qrc



QT+=widgets


DISTFILES += \
    resources/calibration.xml \
    resources/calibration.xml \
    resources/calibration.json \
    test
edit retag flag offensive close merge delete

2 answers

Sort by ยป oldest newest most voted
0

answered 2019-01-15 05:03:38 -0500

berak gravatar image

assuming you installed it correctly, for opencv4, you have to use:

INCLUDEPATH += -I/usr/local/include/opencv4

and

LIBS += -L/usr/local/lib

(yes, the include path was changed, recently, and it's admittedly not very intuitive)

edit flag offensive delete link more

Comments

thanks but can't I just use the source and build folders for include and libraries respectively?

mikeitexpert gravatar imagemikeitexpert ( 2019-01-15 06:22:24 -0500 )edit

no, you can't. neither the src/include nor the build/include folder contain the nessecary headers, look it up.

you can use the libs from the build folder though.

berak gravatar imageberak ( 2019-01-15 06:28:28 -0500 )edit

ok thanks but my includes getting ugly like : #include <opencv4/opencv2/opencv.hpp> Is it ok??

mikeitexpert gravatar imagemikeitexpert ( 2019-01-15 06:38:40 -0500 )edit

no, not ok. try NOT to deviate from the rules, please.

#include <opencv2/opencv.hpp>

(the opencv4 is already in the include path)

berak gravatar imageberak ( 2019-01-15 06:50:20 -0500 )edit

sorry my bad I had to restart the QT

mikeitexpert gravatar imagemikeitexpert ( 2019-01-15 06:56:45 -0500 )edit

@berak thanks for the comments ... let say I want to add more libraries to my build (eg. java bindings etc) how can I install extra those? can I just run sudo make install

mikeitexpert gravatar imagemikeitexpert ( 2019-01-15 13:29:43 -0500 )edit
1

answered 2019-01-15 05:10:04 -0500

kbarni gravatar image

updated 2019-01-15 05:11:28 -0500

First, it's good to install the library. After make, do a sudo make install to copy the library files to the system folders (/usr/local/...)

Then, add to the QT .pro file:

# OpenCV
INCLUDEPATH += /usr/local/include/opencv4
LIBS += $(shell pkg-config opencv --libs)

That's all!

I think there are several problems with your pri file (the paths are not always correct). It's better to use the cleaner method described above.

edit flag offensive delete link more

Comments

@ can you please let me know where in the .pro file I should add the the two lines you mentioned? at the top ? in the middle ? thank you

mikeitexpert gravatar imagemikeitexpert ( 2019-01-15 13:34:12 -0500 )edit

It doesn't matter. I put it generally before the SOURCES/HEADERS part.

kbarni gravatar imagekbarni ( 2019-01-16 10:22:11 -0500 )edit
Login/Signup to Answer

Question Tools

1 follower

Stats

Asked: 2019-01-15 04:55:41 -0500

Seen: 1,691 times

Last updated: Jan 15