opencv——阈值分割图像

#include "stdafx.h"
#include "opencv2\opencv.hpp"

using namespace cv;
IplImage* g_image=NULL;
IplImage* g_gray=NULL;

int g_thresh=;
CvMemStorage* g_storage=NULL;
void on_trackbar(int)
{
    if(g_storage==NULL)
    {
        g_gray=cvCreateImage(cvGetSize(g_image),,);
        g_storage=cvCreateMemStorage();

    }
    else
        cvClearMemStorage(g_storage);

    CvSeq* contours = NULL;
    cvCvtColor(g_image,g_gray,CV_BGR2GRAY);
    cvThreshold(g_gray,g_gray,g_thresh,,CV_THRESH_BINARY);
    cvFindContours(g_gray,g_storage,&contours);
    cvZero(g_gray);
    if(contours)
    {
        cvDrawContours(g_gray,
            contours,
            cvScalarAll(),
            cvScalarAll(),
            );
    }
    cvShowImage("Contours",g_gray);
}
int main(int argc,char** argv)
{

  g_image = cvLoadImage("lena.jpg");
  cvNamedWindow("Contours",);
  cvCreateTrackbar("Threshold","Contours",&g_thresh,,on_trackbar);
  on_trackbar();
  cvWaitKey();
  return ;
}