opencv学习笔记12 图像轮廓的提取和绘制

#include "highgui.h"
#include "cv.h"
#include <iostream>
#include <iomanip>

using namespace std;

int main(void)
{
int i=0;
int mode = CV_RETR_CCOMP;//设置提取轮廓模式
int contours_num=0;//提取轮廓的数目
CvScalar external_color;//绘制轮廓线的颜色
CvScalar hole_color;
CvMemStorage *storage = cvCreateMemStorage(0);
CvSeq *contours =0;//存储提取的轮廓图像

IplImage *pImg = NULL;
IplImage *pContourImg = NULL;//显示提取的轮廓图像
IplImage *src=cvLoadImage("1.png",1);

pImg = cvCreateImage(cvGetSize(src),src->depth,1);
pContourImg =cvCreateImage(cvGetSize(pImg),IPL_DEPTH_8U,3);
cvCvtColor(src,pImg,CV_BGR2GRAY);//将读取的图像转化为灰度图像
cvNamedWindow("src",1);
cvNamedWindow("contour",1);
cvShowImage("src",src);//显示原图
cvThreshold(pImg,pImg,200,255,CV_THRESH_BINARY);//二值化
mode = CV_RETR_LIST;
contours_num=cvFindContours(pImg,storage,&contours,sizeof(CvContour),mode,CV_CHAIN_APPROX_NONE);
cout<<contours_num<<" "<<endl;//打印找到的轮廓的数目
for (;contours!=0;contours=contours->h_next)
{
hole_color=CV_RGB(rand()&255,rand()&255,rand()&255);
external_color = CV_RGB(rand()&255,rand()&255,rand()&255);
cvDrawContours(pContourImg,contours,external_color,hole_color,1,2,8);
}

cvShowImage("contour",pContourImg);
cvWaitKey(0);
cvReleaseImage(&src);
cvReleaseImage(&pImg);
cvReleaseImage(&pContourImg);
cvReleaseMemStorage(&storage);
}