integration d'opencv dans QT sous ubuntu.

bnj,

j'ai compiler mon programme pour l'acquisition d'un video a partir de webcam en utilisant opencv sous QT sous Ubuntu 12.04 voila mon code:

Code :

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 #include <opencv/cv.h>
#include <opencv/highgui.h>
using namespace std;
using namespace cv;

// initialize global variables
int g_slider_position = 0; // trackbar position
CvCapture* g_capture = NULL; // structure to create a video input

// routine to be called when user moves a trackbar slider
void onTrackbarSlide(int pos) {
  cvSetCaptureProperty(
  g_capture,
  CV_CAP_PROP_POS_FRAMES,

  pos
  );
}

int main( int argc, char** argv ) {

// create a window with appropriate size. Windows name is determined by file name
// supplied as an argument
cvNamedWindow( argv[1], CV_WINDOW_AUTOSIZE );
// open video
g_capture = cvCreateFileCapture( argv[1] );
// set read position in units of frames and retrieve total number of frames
int frames = (int) cvGetCaptureProperty(

  g_capture,
  CV_CAP_PROP_FRAME_COUNT
);


// do not create treackbar if video does not include an information
// about number of frames
if( frames!=0 ) {

  cvCreateTrackbar(
  "Position",
  argv[1],
  &g_slider_position,
  frames,

  onTrackbarSlide
  );
}

// display video frame by frame
IplImage* frame;
while(1) {

frame = cvQueryFrame( g_capture );
if( !frame ) break;
cvShowImage( argv[1], frame );
// set trackbar to a current frame position
cvSetTrackbarPos("Position", argv[1], g_slider_position);

g_slider_position++;

char c = cvWaitKey(33);
// quit if ESC is pressed
if( c == 27 ) break;

}
// free memory
cvReleaseCapture( &g_capture );
cvDestroyWindow( argv[1] );
return(0);
}

et voila les lignes de fichier .pro

Code :

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TEMPLATE = app
CONFIG += console
CONFIG -= qt

SOURCES += \webcam.cpp
INCLUDEPATH += /usr/local/include/

LIBS += -L/usr/local/lib\
-lopencv_core \
-lopencv_imgproc \
-lopencv_highgui \
-lopencv_ml \
-lopencv_video \
-lopencv_features2d \
-lopencv_calib3d \
-lopencv_objdetect \
-lopencv_contrib \
-lopencv_legacy \
-lopencv_flann

lorsque je compile, je trouve 22 erreurs . voila:

Code :

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16:48:12: Exécution des étapes de compilation pour le projet exemple1...
16:48:12: Configuration inchangée, étape QMake sautée.
16:48:12: Débute : "/usr/bin/make" -w
make: Entering directory `/home/rafik/traitement_image_opencv/exemple1'
/usr/bin/qmake-qt4 -spec /usr/share/qt4/mkspecs/linux-g++ -o Makefile exemple1.pro
WARNING: /home/rafik/traitement_image_opencv/exemple1/exemple1.pro:5: Unescaped backslashes are deprecated.
WARNING: Failure to find: \webcam.cpp
make: Leaving directory `/home/rafik/traitement_image_opencv/exemple1'
make: Entering directory `/home/rafik/traitement_image_opencv/exemple1'
g++ -Wl,-O1 -o exemple1 webcam.o     -L/usr/local/lib -lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_contrib -lopencv_legacy -lopencv_flann 
/usr/local/lib/libavcodec.so.54: undefined reference to `av_bprint_finalize@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_timecode_make_smpte_tc_string@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_timecode_make_string@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_realloc_f@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_timecode_get_smpte_from_framenum@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_timecode_init@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_samples_set_silence@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_calloc@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_get_media_type_string@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_dynarray_add@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_bprint_init@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_asprintf@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_timecode_make_mpeg_tc_string@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_rescale_q_rnd@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_bprintf@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_samples_copy@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_get_default_channel_layout@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_timecode_init_from_string@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_bprint_chars@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_timecode_adjust_ntsc_framenum@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_tempfile@LIBAVUTIL_51'
make: Leaving directory `/home/rafik/traitement_image_opencv/exemple1'
collect2: ld returned 1 exit status
make: *** [exemple1] Error 1
16:48:12: Le processus "/usr/bin/make" s'est terminé avec le code 2.
Erreur à la compilation du projet exemple1 (cible : Desktop)
Lors de l'exécution de l'étape "Make"

merci de m'aider c'est la premiere fois que j'utilse opencv.

Note: j'ai installer opencv sous /usr/local

ok, j'ai trouve moi meme la solution. Je veux bien le publier.
il faut ajouter dans le fichier .pro les lignes suivantes et verifier bien tous les packages sont bien installees.

Code :

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INCLUDEPATH += /usr/local/include/opencv
LIBS += -L/usr/local/lib \
-lopencv_core \
-lopencv_imgproc \
-lopencv_highgui \
-lopencv_ml \
-lopencv_video \
-lopencv_features2d \
-lopencv_calib3d \
-lopencv_objdetect \
-lopencv_contrib \
-lopencv_legacy \
-lopencv_flann\
-lavutil

[diabolos29]

Bonjour,

Le sujet date de quelques mois mais il m'a bien dépanné. Merci !