Začetniški problem pri klicanju funkcij

void markEdges(IplImage* image,IplImage* edge)
{
CvMemStorage* storage = cvCreateMemStorage(0);
CvSeq* lines = 0;
lines = cvHoughLines2( edge, storage, CV_HOUGH_PROBABILISTIC, 1, 3*CV_PI/180, 75, 10, 20 );
    for( int i = 0; i < lines->total; i++ )
    {
        CvPoint* line = (CvPoint*)cvGetSeqElem(lines,i);
        cvLine( image, line[0], line[1], CV_RGB(255,0,0), 3, 8 );
    }
}

file: imageutil.h
#include <cv_stuff.h>

// prototype
void markEdge(...);


file: imageutil.cpp
#include "imageutil.h"

// implementation
void markEdge(...)
{
   // do stuff
}


file: main.cpp
#include "imageutil.h"

// usage
int main()
{
   // bla bla
   // prepare image data
   markEdge(...);
}