Configuration process of Qt + OpenCV in Ubuntu

Configuration process of Qt + OpenCV in Ubuntu
1: opencv download source codeSelect AllCopyPut in notes

Download the source code of the linux version at the following URL: http://opencv.org/downloads.htmlqtenvironment, which is self-assembled (see section 7th of this blog post)

2: decompress and compile the source code Select All Copy Put in notes

Cd opencv-2.1.0mkdir release & cd releasecmake-D CMAKE_BUILD_TYPE = RELEASE-D CMAKE_INSTALL_PREFIX =/usr/local-DWITH_FFMPEG = OFF .. make sudo make install the library file in the/usr/localopencv installation directory is under the/usr/local/lib directory.

3: Common compilation error Solutions Select All Copy Put in notes

1: error 'ptrdiff _ t' does not name a type opencv solution: In/include/opencv/cxcore. add the following row in the hpp file: using std: vector; using std: string; + using std: ptrdiff_t; // This is the added row in 56 rows 2: error: 'unlink' was not declared in this scope solution: in src/highgui/loadsave. add the following line in cpp # include <unistd. h> 3: error: 'codec _ id_h264' was not declared in this scope solution: Method 1: sudo apt-get install libopencv-dev and re-compile ffmpeg using the following methods :. /configure -- enable-shared -- disable-staticmakesudo make install method 2: disable ffmpeg when using cmake without using FFMPEG.-DWITH_FFMPEG = OFF4: undefined reference to 'cvcreatecameracapture _ V4L (int) 'vim opencv-2.1.0/src/highgui/cvcap_v4l.cpp 217 # ifdef HAVE_CAMV4L 218 # include <linux/videodev. h> 219 # endifvim opencv-2.1.0/src/highgui/cvcap. cpp changes 164 # if defined (HAVE_CAMV4L) | defined (HAVE_CAMV4L2) to 164 # if defined (HAVE_CAMV4L) 5: The other errors are unlike and no declare is found, only the unistd must be added to the corresponding source file. the h header file can be resolved and finally compiled through: Linking CXX shared library .. /.. /lib/cv. so [100%] Built target cvpy

4: add the path of the self-generated Dynamic Link Library to the path that can be found by the system. Select All Copy Put in notes

sudo -secho "/usr/local/lib" > /etc/ld.so.conf.d/opencv.confsudo ldconfig

5. Before compiling the Qt + opencv project, add the following content to the. pro file: Select All Copy Put in notes

// Add the header file path to compile with INCLUDEPATH + = ../opencv-2.1.0/include/opencv2 // Add the library to be used, the link uses unix :! Macx: LIBS + =-lcvunix :! Macx: LIBS + =-lcvauxunix :! Macx: LIBS + =-lcxcoreunix :! Macx: LIBS + =-lhighguiunix :! Macx: LIBS + =-lml

6: The previous shadow removal program Graph

7. install and configure the Qt Environment Select All Copy Put in notes

1: Download the official qt-creator file qt-creator-opensource-linux-x86_64-3.2.0.run2: install qt4 or qt5sudo apt-get install qt4-defaultsudo apt-get install qt5-defaultsudo apt-get install qtcreator3 from the source: use qt-creator to create a new qt project in kits --> Qt Versions, add/usr/bin/qmake-qt4.

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