OpenCV

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Denne side giver en bl?d introduktion til OpenCV, som er et kraftigt bibliotek til billedbehandling og Computer Vision udviklet i C. OpenCV's hjemmeside kan ses [http://www.intel.com/technology/computing/opencv/index.htm her]. Projektet har desuden en god [http://opencvlibrary.sourceforge.net/ wiki].
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OpenCV's hjemmeside kan ses [http://www.intel.com/technology/computing/opencv/index.htm her]. Projektet har desuden en god [http://opencvlibrary.sourceforge.net/ wiki].
Generelt er OpenCV yderst veldokumenteret, s denne side giver kun et par simple eksempler p anvendelse. Et problem ved OpenCV's dokumentation er dog at der er s meget af den, hvilket kan g?re det hele noget uoverskueligt. Man skal derfor vide hvad man leder efter -- men bare rolig, det l?rer man med tiden.
Generelt er OpenCV yderst veldokumenteret, s denne side giver kun et par simple eksempler p anvendelse. Et problem ved OpenCV's dokumentation er dog at der er s meget af den, hvilket kan g?re det hele noget uoverskueligt. Man skal derfor vide hvad man leder efter -- men bare rolig, det l?rer man med tiden.

Revision as of 21:17, 13 June 2007

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Generelt er OpenCV yderst veldokumenteret, s� denne side giver kun et par simple eksempler p� anvendelse. Et problem ved OpenCV's dokumentation er dog at der er s� meget af den, hvilket kan g?re det hele noget uoverskueligt. Man skal derfor vide hvad man leder efter -- men bare rolig, det l?rer man med tiden.

Strukturen af OpenCV

OpenCV best?r af tre dele

  • cxcore stiller diverse basale strukturer til r?dighed. Dette inkluderer strukturer til billeder, matricer, punkter, o.lign. Desuden indeholder cxcore basale grafiske funktioner, s� som tegning af linier, cirkler, firkanter, osv.
  • cv indeholder funktioner til billedbehandling, Computer Vision og m?nstergenkendelse. Det vil sige funktioner til kantdetektion, kamerakalibrering, beregning af motion flow, klyngeanalyse og s� videre.
  • highgui indeholder funktioner til opbygning af simple grafiske brugergr?nseflader og til indl?sning af billeder. Dvs. at highgui prim?rt bruges til at hente billeder (fra kamera og filer) og derefter vise dem.

Hvordan benyttes OpenCV p� Linux?

En af OpenCV's styrker er at det er let at benytte. Hver af de tre dele af OpenCV stiller en header-fil til r?dighed der blot skal inkluderes i dit C/C program. Dvs. f?lgende tre header-filer er interessante: "cxcore.h", "cv.h" og "highgui.h".

For at overs?tte programmer der benytter OpenCV, benyttes programmet pkg-config. Dette program fort?ller blot hvilke argumenter der skal gives til overs?tteren for at OpenCV kan benyttes. Kommandoen

pkg-config --cflags opencv

udskriver de argumenter der skal gives til overs?tteren for at den kan finde OpenCV, mens kommandoen

pkg-config --libs opencv

udskriver de argumenter der skal gives til overs?tteren for at den kan linke til OpenCV. Dette g?r det yderst nemt at skrive en passende Makefile. Her gives et mindre eksempel, som du selv m� tilpasse til dit eget projekt.

# Compile and link flags
CXX      =  g  
CXXFLAGS = `pkg-config opencv --cflags` -Wall
LIBS     = `pkg-config opencv --libs`

# Name of executable
EXECUTABLE = myprogram

# Files
SOURCES = myprogram.cc myauxilaryfunction.cc
OBJECTS = $(patsubst %.cc, %.o, $(SOURCES))

# Linking
all: $(OBJECTS)
	$(CXX) $(LIBS) $(OBJECTS) -o $(EXECUTABLE)

# Compilation
%.o : %.cc
	$(CXX) $(CXXFLAGS) -c $^

Eksempel 1

Det f?rste eksempel vi ser p� tager billeder fra et kamera og viser dem i et vindue. Det er formentlig det mest simple og alligevel nyttige program der kan skrives i OpenCV. Programmet kan findes i Robot Eksperimentariums SVN under Examples/opencv/Eksempel1 og best?r af filen eksempel1.cc og en tilh?rende Makefile.

#include "highgui.h"

int main() 
{
    // Get an OpenCV camera handle
    CvCapture *cam = cvCaptureFromCAM(-1);

    // Initialise the GUI
    const char *window = "Eksempel 1";
    cvNamedWindow(window, CV_WINDOW_AUTOSIZE);

    // The main loop
    while (cvWaitKey(4) == -1) {
        IplImage *im = cvQueryFrame(cam);
        cvShowImage(window, im);
    }

    // Clean up
    cvDestroyAllWindows();
    cvReleaseCapture(
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