Installing OpenCV 2.3.1 with Qt

Installing OpenCV 2.3.1 with Qt

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  Installing OpenCV 2.3.1 with Qt Luigi De Russis Politecnico di Torino Dipartimento di Automatica e Informatica (DAUIN) Torino - Italy luigi.derussis@polito.it This work is licensed under the Creative Commons (CC BY-SA) License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/3.0/
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  0. Getting started…  Official installation guide: http://opencv.willowgarage.com/wiki/InstallGuide  Prerequisites:  [Mac OS X] Xcode 3.2 or later  [Linux] GCC 4.3 or later 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 2
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  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
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  1. Qt SDK(II) - Windows 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 4
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  1. Qt SDK(II) - Windows At the end, check if the folder C:QtSDKmingwbin (or similar) is included in the PATH variable 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 5
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  2. OpenCV 2.3.1  Download and unpack OpenCV 2.3.1 from http://opencv.willowgarage.com/wiki 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 6
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  3. Cmake (I)  Download and install Cmake from http://www.cmake.org/ 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 7
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  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
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  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” folder only 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
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  3. Cmake (III)  Run Cmake 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 10
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  3. Cmake (III)  “Where is the source code” field requires the location of the opencv folder  “Where to build the binaries” field requires the location of the “debug” folder, previously created  Now press the button “Configure”… 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 11
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  3. Cmake (IV)  In the next window, select “MingGW Makefiles” under Windows, “Unix Makefiles” otherwise  Then, press “Finish” 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 12
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  3. Cmake (V)  The Cmake window should appear in this way: 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 13
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  3. Cmake (VI)  Open the CMAKE entry and assign the value DEBUG to the CMAKE_BUILD_TYPE variable 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 14
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  3. Cmake (VII)  Open the WITH entry:  uncheck WITH_CUDA and WITH_EIGEN  check WITH_QT  Press “Configure”, again 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 15
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  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
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  3. Cmake (IX)  Click again on “Configure” (until the entries background becomes totally white) 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 17
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  3. Cmake (X)  Press “Generate”  Repeat 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 RELEASE 11/09/2011 Luigi De Russis - Computer Vision - OpenCV 18
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  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 enter  Wait…  Repeat the previous two steps for the “release” folder  Copy the “include” folder (the one inside the “build” folder) from the WINDOWS version of opencv in your “builds_with_Qt” folder 11/09/2011 Luigi De Russis - Computer Vision - OpenCV 19
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  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
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  4b. Final steps,on Windows (I)  Open the command prompt, move to the “debug” folder, type “mingw32-make” and press enter  Wait…  Repeat the previous two steps for the “release” folder 11/09/2011 Luigi De Russis - Computer Vision - OpenCV 21
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  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/bin  How do I set the PATH variable? Read here. 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 22
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  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” folder  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! 11/11/2011 Luigi De Russis - Computer Vision - OpenCV 23