opencv学习笔记12 图像轮廓的提取和绘制

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#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);}

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