opencv 轮廓的凸包，凸缺陷

代码：

#include <cv.h>
#include <cxcore.h>
#include <highgui.h>
#include <cvaux.h>
#include <iostream>
using namespace std;

int main()
{
	IplImage *src = cvLoadImage("f:\\images\\test2.bmp",CV_LOAD_IMAGE_GRAYSCALE);
	IplImage *dst = cvCreateImage(cvGetSize(src),8,3);cvZero(dst);
	CvMemStorage *storage = cvCreateMemStorage();
	CvSeq *contour = NULL , *hull = NULL;

	CvContourScanner scanner = cvStartFindContours(src,storage);
	while((contour = cvFindNextContour(scanner)) != NULL){
		cvDrawContours(dst,contour,CV_RGB(255,0,0),CV_RGB(0,255,0),0);
		
		cout<<cvCheckContourConvexity(contour)<<endl;

		hull = cvConvexHull2(contour,0,CV_CLOCKWISE,0);
		
		CvPoint pt0 = **(CvPoint**)cvGetSeqElem(hull,hull->total - 1);
		for(int i = 0;i<hull->total;++i){
			CvPoint pt1 = **(CvPoint**)cvGetSeqElem(hull,i);
			cvLine(dst,pt0,pt1,CV_RGB(0,0,255));
			pt0 = pt1;
		}

		CvSeq *defect = cvConvexityDefects(contour,hull);
		
		for(int i = 0;i<defect->total;++i){
			CvConvexityDefect df = *(CvConvexityDefect*)cvGetSeqElem(defect,i);
			cvCircle(dst,*df.start,2,CV_RGB(255,255,0),-1);
			cvCircle(dst,*df.end,2,CV_RGB(255,255,0),-1);
			cvCircle(dst,*df.depth_point,2,CV_RGB(0,255,255),-1);
		}
		
		cvShowImage("dst",dst);
		cvWaitKey();
	}
	cvEndFindContours(&scanner);
}