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How to install openCv in Qt

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opencvqt 5.4.0path
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    SGaist
    Lifetime Qt Champion
    wrote on 15 May 2016, 21:16 last edited by
    #2

    Hi,

    You must use backslashes when doing multiline assignments like this one.

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      Trav
      wrote on 15 May 2016, 22:14 last edited by
      #3

      Im using he backslashes just essentially replaced what I had above ****** LIBS += -L\usr\local\lib
      -lopencv_core
      -lopencv_imgproc
      -lopencv_features2d
      -lopencv_highgui

      But still am having difficulties is there something I'm missing here? I am using Mac OSX... and have accomplished this is Xcode but just doesn't seem to be working is there anything else to configure etc?

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      • S Offline
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        SGaist
        Lifetime Qt Champion
        wrote on 16 May 2016, 20:23 last edited by
        #4

        I meant: use backslashes when marking a new line. For the paths themselves use forward slashes.

        What error are you getting ?

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        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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          Trav
          wrote on 17 May 2016, 04:15 last edited by
          #5

          @Trav said:

          LIBS += -L/usr/local/lib
          -lopencv_core /
          -lopencv_imgproc /
          -lopencv_features2d/
          -lopencv_highgui

          2 days ago

          sorry for the wait... all I'm getting is opencv.cpp not found... is there solid documentation somewhere on this subject? thank you

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            SGaist
            Lifetime Qt Champion
            wrote on 17 May 2016, 06:50 last edited by
            #6

            opencv.cpp not found ? Where's that file coming from ?

            Not knowing what your current error relates to I can't give you any recommendation.

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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              Trav
              wrote on 17 May 2016, 23:09 last edited by
              #7

              The actual file itself 'openCV ' is located on my desktop... I made a file 'build' inside the folder and then 'lib' where all the files are located ; highgui etc. Is there a crucial step I missed here ? I mean I downloaded openCV installed Cmake by following a tutorial and installed this perfectly fine in Xcode.. But since moving to Qt I have not been able to get the same results.

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                Trav
                wrote on 18 May 2016, 00:23 last edited by
                #8

                Could you please tell me in your case how would you do this if you were using Mac assuming we have Qt installed and openCV...

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                • S Offline
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                  SGaist
                  Lifetime Qt Champion
                  wrote on 18 May 2016, 06:30 last edited by
                  #9

                  There are several possibilities.

                  You can use pkg-config or do it like you do currently and provide the INCLUDEPATH and LIBS with the adequate data.

                  Can you share your complete .pro file ? From the bits you've given, one time you have used the wrong line ending char and the other you are complete missing it.

                  Example:

                  LIBS += \
                      -L/usr/local/lib \
                      -lopencv_core \
                      -lopencv_highgui
                  
                  INCLUDEPATH += \
                      /usr/local/include 
                  

                  You should also post the exact error you are having.

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                    Trav
                    wrote on 19 May 2016, 04:47 last edited by
                    #10

                    Yes please see bottom for code. If it at all has changed I have been modifying it and tuning it according to different tutorials to see if it'll work etc. But essentially the end result is the same ERROR: opencv.h not found' when using ' #include <opencv.h> or something similar; highgui, core ...

                    #-------------------------------------------------

                    Project created by QtCreator 2016-05-15T23:16:25

                    #-------------------------------------------------

                    QT += core gui

                    greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

                    TARGET = cam
                    TEMPLATE = app

                    // new
                    QT += core
                    QT -= gui

                    TARGET = RP_openCV_01
                    CONFIG += console
                    CONFIG -= app_bundle

                    TEMPLATE = app

                    SOURCES += main.cpp
                    mainwindow.cpp

                    LIBS += -L/opt/local/lib
                    -lopencv_highgui.3.1.0
                    -lopencv_core.3.1.0

                    INCLUDEPATH += /opt/local/include

                    HEADERS += mainwindow.h

                    FORMS += mainwindow.ui

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                      Trav
                      wrote on 19 May 2016, 04:54 last edited by
                      #11

                      Only error is the error that is indicating the header files are not found " OPENCV.H not found!'

                      QT += core gui

                      greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

                      TARGET = cam
                      TEMPLATE = app

                      // new
                      QT += core
                      QT -= gui

                      TARGET = RP_openCV_01
                      CONFIG += console
                      CONFIG -= app_bundle

                      TEMPLATE = app

                      SOURCES += main.cpp
                      mainwindow.cpp

                      LIBS += -L/opt/local/lib
                      -lopencv_highgui.3.1.0
                      -lopencv_core.3.1.0

                      INCLUDEPATH += /opt/local/include

                      HEADERS += mainwindow.h

                      FORMS += mainwindow.ui

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                        SGaist
                        Lifetime Qt Champion
                        wrote on 19 May 2016, 21:26 last edited by
                        #12

                        Shouldn't it be #include <opencv2/opencv.hpp> ?

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                          Trav
                          wrote on 20 May 2016, 02:17 last edited by
                          #13

                          Sorry, yes; I have used the #include <opencv2/opencv.hpp> and the error I stated above is still valid

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                            SGaist
                            Lifetime Qt Champion
                            wrote on 20 May 2016, 06:55 last edited by
                            #14

                            Do you mean the opencv.h not found error ?

                            Interested in AI ? www.idiap.ch
                            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                              Trav
                              wrote on 21 May 2016, 21:57 last edited by
                              #15

                              Hey, thanks for your help I actually got it and have reproduced the desired outcome... essentially what happened because I am new to Qt & OpenCV etc. It seems I have placed the code before Sources' in the project.pro file which produced the errors... I did this before as well I don't quite understand why it decides to work now but did not before? but essentially I'm good :) thanks for support

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                                SGaist
                                Lifetime Qt Champion
                                wrote on 21 May 2016, 22:20 last edited by
                                #16

                                Good !

                                In that case, please mark the thread as solved using the "Topic Tool" button so that other forum users may know a solution has been found :)

                                Interested in AI ? www.idiap.ch
                                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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