OpenCV Installation on Ubuntu 16.04 and Integration with Qt

OpenCV Installation on Ubuntu 16.04 and Integration with Qt 

Step 1: Download latest version of OpenCV (OpenCV 3.2.0 is downloaded for this installation)

Step 2: "opencv-3.2.0" folder is extracted from downloaded "opencv-3.2.0.zip".

Step 3: Extracted folder contains sub-folders and files as seen following image. 2 folders named "source" and "build" are created and then all these sub-folders and files are cut and copied to the "source" folder. At this stage, "build" folder remains empty.

 

Step 4: If you do not have Cmake-GUI, you can install it using following code.

sudo apt install cmake-gui

Step 5: Open Cmake-GUI and define your "build" and "source" folders path like following image. Then click "Configure" button.

Step 6: After configuration done, select "WITH_QT" property "ON". 

Step 7: Click "Generate" button and wait until seeing "Generating done" message.

Note: You may encounter following error.

You can solve this issue writing following code.

sudo apt-get install qt5-default

Step 8: Open terminal and go to "build" folder and run following code to complete installation.

sudo make install

 

Step 9: In order to use your OpenCV libraries in Qt Creator, you only need to define OpenCV libraries path in the project (.pro) file as seen following image.

INCLUDEPATH += /home/eyyup/Downloads/opencv-3.2.0/build/include

LIBS += -L"/home/eyyup/Downloads/opencv-3.2.0/build/lib"

LIBS += -lopencv_calib3d

LIBS += -lopencv_core

LIBS += -lopencv_features2d

LIBS += -lopencv_flann

LIBS += -lopencv_highgui

LIBS += -lopencv_imgcodecs

LIBS += -lopencv_imgproc

LIBS += -lopencv_ml

LIBS += -lopencv_objdetect

LIBS += -lopencv_photo

LIBS += -lopencv_shape

LIBS += -lopencv_stitching

LIBS += -lopencv_superres

LIBS += -lopencv_video

LIBS += -lopencv_videoio

LIBS += -lopencv_videostab