Discussion :

[jean_pierr]

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

[jean_pierr]

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

[Invité]

Bonjour,

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