Discussion :

[Vicolaships]

Salut,

Je cherche à compiler un petit projet Qt qui utilise OpenCV. Je suis sous Ubuntu 12.04 (64 bits).

J'ai suivi ce tutoriel et j'ai compilé la version 2.4.3 d'OpenCV.

Code :

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victor@test:~/OpenCV-2.4.3/build$ cmake -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON -D WITH_FFMPEG=ON ..
-- Detected version of GNU GCC: 46 (406)
-- Found OpenEXR: /usr/lib/libIlmImf.so
-- checking for module 'gstreamer-base-0.10'
--   package 'gstreamer-base-0.10' not found
-- Looking for linux/videodev.h
-- Looking for linux/videodev.h - not found
-- Looking for linux/videodev2.h
-- Looking for linux/videodev2.h - found
-- Looking for libavformat/avformat.h
-- Looking for libavformat/avformat.h - found
-- Looking for ffmpeg/avformat.h
-- Looking for ffmpeg/avformat.h - not found
CUDA_TOOLKIT_ROOT_DIR not found or specified
-- Could NOT find CUDA (missing:  CUDA_TOOLKIT_ROOT_DIR CUDA_NVCC_EXECUTABLE CUDA_INCLUDE_DIRS CUDA_CUDART_LIBRARY) (Required is at least version "4.1")
-- Found Sphinx Sphinx v1.1.3: /usr/bin/sphinx-build
-- 
-- General configuration for OpenCV 2.4.3 =====================================
-- 
--   Platform:
--     Host:                        Linux 3.5.0-23-generic x86_64
--     CMake:                       2.8.7
--     CMake generator:             Unix Makefiles
--     CMake build tool:            /usr/bin/make
--     Configuration:               Release
-- 
--   C/C++:
--     Built as dynamic libs?:      YES
--     C++ Compiler:                /usr/bin/c++  (ver 4.6.3)
--     C++ flags (Release):         -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -O3 -DNDEBUG  -DNDEBUG
--     C++ flags (Debug):           -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -g  -O0 -DDEBUG -D_DEBUG -ggdb3
--     C Compiler:                  /usr/bin/gcc
--     C flags (Release):           -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -O3 -DNDEBUG  -DNDEBUG
--     C flags (Debug):             -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -g  -O0 -DDEBUG -D_DEBUG -ggdb3
--     Linker flags (Release):      
--     Linker flags (Debug):        
--     Precompiled headers:         NO
-- 
--   OpenCV modules:
--     To be built:                 core imgproc flann highgui features2d calib3d ml video objdetect contrib nonfree photo legacy gpu python stitching ts videostab
--     Disabled:                    world
--     Disabled by dependency:      -
--     Unavailable:                 androidcamera java ocl
-- 
--   GUI: 
--     QT 4.x:                      YES (ver 4.8.1 EDITION = OpenSource)
--     QT OpenGL support:           YES (/usr/lib/x86_64-linux-gnu/libQtOpenGL.so)
--     OpenGL support:              YES (/usr/lib/x86_64-linux-gnu/libGLU.so /usr/lib/x86_64-linux-gnu/libGL.so /usr/lib/x86_64-linux-gnu/libSM.so /usr/lib/x86_64-linux-gnu/libICE.so /usr/lib/x86_64-linux-gnu/libX11.so /usr/lib/x86_64-linux-gnu/libXext.so)
-- 
--   Media I/O: 
--     ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.3.4)
--     JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver )
--     PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.2.46)
--     TIFF:                        /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 - 3.9.5)
--     JPEG 2000:                   /usr/lib/x86_64-linux-gnu/libjasper.so (ver 1.900.1)
--     OpenEXR:                     /usr/lib/libImath.so /usr/lib/libIlmImf.so /usr/lib/libIex.so /usr/lib/libHalf.so /usr/lib/libIlmThread.so (ver 1.6.1)
-- 
--   Video I/O:
--     DC1394 1.x:                  NO
--     DC1394 2.x:                  YES (ver 2.2.0)
--     FFMPEG:                      YES
--       codec:                     YES (ver 53.35.0)
--       format:                    YES (ver 53.21.1)
--       util:                      YES (ver 51.22.1)
--       swscale:                   YES (ver 2.1.0)
--       gentoo-style:              YES
--     GStreamer:                   NO
--     OpenNI:                      NO
--     OpenNI PrimeSensor Modules:  NO
--     PvAPI:                       NO
--     GigEVisionSDK:               NO
--     UniCap:                      NO
--     UniCap ucil:                 NO
--     V4L/V4L2:                    Using libv4l (ver 0.8.6)
--     XIMEA:                       NO
--     Xine:                        NO
-- 
--   Other third-party libraries:
--     Use IPP:                     NO
--     Use TBB:                     YES (ver 4.0 interface 6000)
--     Use Cuda:                    NO
--     Use OpenCL:                  NO
--     Use Eigen:                   YES (ver 2.0.17)
-- 
--   Python:
--     Interpreter:                 /usr/bin/python (ver 2.7.3)
--     Libraries:                   /usr/lib/libpython2.7.so
--     numpy:                       /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.6.1)
--     packages path:               lib/python2.7/dist-packages
-- 
--   Documentation:
--     Build Documentation:         YES
--     Sphinx:                      /usr/bin/sphinx-build (ver Sphinx v1.1.3)
--     PdfLaTeX compiler:           /usr/bin/pdflatex
-- 
--   Tests and samples:
--     Tests:                       YES
--     Performance tests:           YES
--     Examples:                    YES
-- 
--   Install path:                  /usr/local
-- 
--   cvconfig.h is in:              /home/victor/OpenCV-2.4.3/build
-- -----------------------------------------------------------------
-- 
-- Configuring done
-- Generating done
-- Build files have been written to: /home/victor/OpenCV-2.4.3/build

Le projet Qt est assez simple, je l'ai trouvé ici

Voilà le fichier .PRO adapté pour Linux :

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#-------------------------------------------------
#
# Project created by QtCreator 2013-03-24T11:56:13
#
#-------------------------------------------------
 
QT       += core gui
 
TARGET = OpenCV_Webcam
TEMPLATE = app
 
INCLUDEPATH += /usr/local/include/opencv
 
LIBS += -L/usr/local/lib -lopencv_ffmpeg -llibopencv_gpu -lopencv_calib3d -lopencv_contrib -lopencv_core -lopencv_features2d  -opencv_flann -lopencv_highgui -lopencv_imgproc -lopencv_legacy -lopencv_ml -lopencv_objdetect -lopencv_video
 
SOURCES += main.cpp\
        mainwindow.cpp
 
HEADERS  += mainwindow.h
 
FORMS    += mainwindow.ui

A la compilation j'ai ces deux erreurs :

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erreur : cannot find -lopencv_ffmpeg 
erreur : cannot find -llibopencv_gpu

Voilà ma question : comment compiler OpenCV pour que ça marche ?
Merci d'avance