Problem with OpenCV on Ubuntu

[Creatorczyk]

Hi,

I want to add library Open CV to my qt project so in the pro file I added:

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = ClientApp
TEMPLATE = app

DEFINES += QT_DEPRECATED_WARNINGS

CONFIG += c++11 \
          opencv

INCLUDEPATH += -I/usr/local/include/opencv4
LIBS += -L/usr/local/lib -lopencv_core -lopencv_imgcodecs -lopencv_highgui

SOURCES += \
        main.cpp \
        mainwindow.cpp

HEADERS += \
        mainwindow.h

FORMS += \
        mainwindow.ui

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

But when I try to include in mainwindow.h:

#include <opencv4/opencv2/core/core.hpp>

I get error :

/usr/local/include/opencv4/opencv2/core/core.hpp:48: error: opencv2/core.hpp: No such file or directory
 #include "opencv2/core.hpp"
          ^~~~~~~~~~~~~~~~~~

I checked the core.hpp file in this path and it is. What could I do?

[Pl45m4]

@Creatorczyk said in Problem with OpenCV on Ubuntu:

#include <opencv4/opencv2/core/core.hpp>

Remove opencv4 and try just #include <opencv2/core/core.hpp>
Your *.pro file looks correct.

What version of OCV do you have installed?

[SGaist]

Hi,

@Creatorczyk said in Problem with OpenCV on Ubuntu:

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

You are providing the include path up to opencv4. Either remove it here, or as @Pl45m4 remove it from your includes.

Note that you do not need to add the -I with INCLUDEPATH.

[Creatorczyk]

@SGaist I removed -I from include and it's works. Thanks!