1. Installing OpenCV2.3.1 with Qt Luigi De RussisPolitecnico di TorinoDipartimento di Automatica e Informatica (DAUIN)Torino - Italyluigi.derussis@polito.itThis work is licensed under the Creative Commons (CC BY-SA) License. To view a copy of this license, visithttp://creativecommons.org/licenses/by-sa/3.0/

2. 0. Getting startedOfficial installation guide: http://opencv.willowgarage.com/wiki/InstallGuidePrerequisites: [Mac OS X] Xcode 3.2 or later [Linux] GCC 4.3 or later11/11/2011 Luigi De Russis - Computer Vision - OpenCV 2 3. 1. Qt SDK (I)Download and install Qt SDK from http://qt.nokia.com/downloads, using the offline installer (current release 4.7.4)[Windows-only] Perform a custom installation, installing all the mingw32 stuff. Components about Meego, Symbian, etc. are not necessary for our purpose (see next slide)11/11/2011 Luigi De Russis - Computer Vision - OpenCV 3 4. 1. Qt SDK (II) - Windows11/11/2011 Luigi De Russis - Computer Vision - OpenCV 4 5. 1. Qt SDK (II) - WindowsAt the end, check if the folder C:QtSDKmingwbin (or similar) is included in the PATH variable11/11/2011 Luigi De Russis - Computer Vision - OpenCV 5 6. 2. OpenCV 2.3.1Download and unpack OpenCV 2.3.1 from http://opencv.willowgarage.com/wiki11/11/2011 Luigi De Russis - Computer Vision - OpenCV 6 7. 3. Cmake (I)Download and install Cmake from http://www.cmake.org/11/11/2011Luigi De Russis - Computer Vision - OpenCV 7 8. 3. Cmake (II)Create a folder named builds_with_Qt (or similar) wherever you want (suggested location: inside the opencv folder)Create two new folders named debug and release inside the builds_with_Qt folder[Mac-only] Warning: choose carefully where you put the builds_with_Qt folder. To move the folder, thus maintaining the compiled opencv library working, may require a little bit effort (by using install_name_tool).11/11/2011 Luigi De Russis - Computer Vision - OpenCV 8 9. 3. Cmake (II)Create a folder named builds_with_Qt (or similar) wherever you want (suggested location: inside the opencv folder)Create two new folders named debug and It is not strongly mandatory release inside the builds_with_Qt folderonly a best practice![Mac-only] Warning: choose carefully where you put the builds_with_Qt folder. To move the folder, thus maintaining the compiled opencv library working, may require a little bit effort (by using install_name_tool).11/11/2011 Luigi De Russis - Computer Vision - OpenCV 9 10. 3. Cmake (III)Run Cmake11/11/2011 Luigi De Russis - Computer Vision - OpenCV 10 11. 3. Cmake (III)Where is the source code field requires the location of the opencv folderWhere to build the binaries field requires the location of the debug folder, previously createdNow press the button Configure11/11/2011Luigi De Russis - Computer Vision - OpenCV 11 12. 3. Cmake (IV)In the next window, select MingGW Makefiles under Windows, Unix Makefiles otherwiseThen, press Finish11/11/2011 Luigi De Russis - Computer Vision - OpenCV 12 13. 3. Cmake (V)The Cmake window should appear in this way:11/11/2011Luigi De Russis - Computer Vision - OpenCV 13 14. 3. Cmake (VI)Open the CMAKE entry and assign the value DEBUG to the CMAKE_BUILD_TYPE variable11/11/2011 Luigi De Russis - Computer Vision - OpenCV 14 15. 3. Cmake (VII)Open the WITH entry: uncheck WITH_CUDA and WITH_EIGEN check WITH_QT Press Configure, again11/11/2011 Luigi De Russis - Computer Vision - OpenCV 15 16. 3. Cmake (VIII)Open the QT entry with a red background and add the location of qmake to the variable QT_QMAKE_EXECUTABLE (qmake is in /Desktop/Qt/4.7.4/mingw/bin inside the folder where Qt SDK has been installed)11/11/2011 Luigi De Russis - Computer Vision - OpenCV 16 17. 3. Cmake (IX)Click again on Configure (until the entries background becomes totally white)11/11/2011Luigi De Russis - Computer Vision - OpenCV 17 18. 3. Cmake (X)Press GenerateRepeat the steps reported on slides 11 - 18, changing: the build destination folder from debug to release the value of the CMAKE_BUILD_TYPE variable (in the CMAKE entry) to RELEASE11/09/2011Luigi De Russis - Computer Vision - OpenCV 18 19. 4a. Final steps, on Linux/Mac(I)Open the terminal, move to the debug folder, type make -jN, where N is the number of threads to use (typically, dual core processor can efficiently handle 4 threads), and press enterWaitRepeat the previous two steps for the release folderCopy the include folder (the one inside the build folder) from the WINDOWS version of opencv in your builds_with_Qt folder11/09/2011Luigi De Russis - Computer Vision - OpenCV 19 20. 4a. Final steps, on Linux/Mac(II)Copy the file opencv.hpp from /include/opencv2 to include (in your builds_with_Qt folder)Done: you can start to use OpenCV with Qt!11/09/2011 Luigi De Russis - Computer Vision - OpenCV 20 21. 4b. Final steps, on Windows (I)Open the command prompt, move to the debug folder, type mingw32-make and press enterWaitRepeat the previous two steps for the release folder11/09/2011 Luigi De Russis - Computer Vision - OpenCV 21 22. 4b. Final steps, on Windows(II)Add to the PATH environment variable the location of the following folders: bin folder inside debug bin folder inside release QtSDK/Desktop/Qt/4.7.4/mingw/binHow do I set the PATH variable? Read here.11/11/2011Luigi De Russis - Computer Vision - OpenCV 22 23. 4b. Final steps, on Windows(III)Copy the include folder (the one inside the build folder in the opencv folder) in your builds_with_Qt folderCopy the file opencv.hpp from /include/opencv2 to include (in your builds_with_Qt folder)Done: you can start to use OpenCV with Qt!11/11/2011Luigi De Russis - Computer Vision - OpenCV 23