How to install openCv in Qt
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Hello,
I am looking for context in regards to getting openCv essentially in my application to work. I have managed to do what I would like to accomplish but am taking a learning curve and diving into Qt for lots of obvious reasons and at this point I just am learning and navigating so far what I have found though is to put (see below) into the .pro file but nothing is happening or suggesting when [example ] #include<opencv>
LIBS += -L/usr/local/lib
-lopencv_core /
-lopencv_imgproc /
-lopencv_features2d/
-lopencv_highgui -
Hi,
You must use backslashes when doing multiline assignments like this one.
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Im using he backslashes just essentially replaced what I had above ****** LIBS += -L\usr\local\lib
-lopencv_core
-lopencv_imgproc
-lopencv_features2d
-lopencv_highguiBut 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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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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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.
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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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There are several possibilities.
You can use pkg-config or do it like you do currently and provide the
INCLUDEPATHandLIBSwith 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/includeYou should also post the exact error you are having.
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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 -= guiTARGET = RP_openCV_01
CONFIG += console
CONFIG -= app_bundleTEMPLATE = app
SOURCES += main.cpp
mainwindow.cppLIBS += -L/opt/local/lib
-lopencv_highgui.3.1.0
-lopencv_core.3.1.0INCLUDEPATH += /opt/local/include
HEADERS += mainwindow.h
FORMS += mainwindow.ui
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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 -= guiTARGET = RP_openCV_01
CONFIG += console
CONFIG -= app_bundleTEMPLATE = app
SOURCES += main.cpp
mainwindow.cppLIBS += -L/opt/local/lib
-lopencv_highgui.3.1.0
-lopencv_core.3.1.0INCLUDEPATH += /opt/local/include
HEADERS += mainwindow.h
FORMS += mainwindow.ui
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Shouldn't it be
#include <opencv2/opencv.hpp>? -
Do you mean the opencv.h not found error ?
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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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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 :)
