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#include "cv.h"#include "highgui.h"int slider_pos=70;//阈值IplImage *image02 =0,*image03 = 0,*image04 = 0;void process_image(int h);int main(int argc ,char **argv){    const char *filename ="rice.png";    if ((image03 = cvLoadImage(filename,0))==0)//读入图像为灰度图像    {        return -1;    }    image02 = cvCloneImage(image03);    image04 = cvCloneImage(image03);        cvNamedWindow("Source",1);    cvNamedWindow("Result",1);    cvShowImage("Source",image03);    cvCreateTrackbar("Threshold","Result",&slider_pos,255,process_image);    process_image(0);    cvWaitKey(0);    cvSaveImage("1.jpg",image04);    cvReleaseImage(&image02);    cvReleaseImage(&image03);    cvDestroyWindow("Source");    cvDestroyWindow("Result");    return 0;}//这个函数寻找出轮廓、用椭圆拟合画出void process_image(int h){    CvMemStorage *stor;    CvSeq *cont;    CvBox2D32f *box;    CvPoint *PointArray;    CvPoint2D32f *PointArray2D32f;    stor = cvCreateMemStorage(0);    cont = cvCreateSeq(CV_SEQ_ELTYPE_POINT,sizeof(CvSeq),sizeof(CvPoint),stor);    cvThreshold(image03,image02,slider_pos,255,CV_THRESH_BINARY);    cvFindContours(image02,stor,&cont,sizeof(CvContour),        CV_RETR_LIST,CV_CHAIN_APPROX_NONE,cvPoint(0,0));    cvZero(image02);    cvZero(image04);    //绘制所有轮廓并用椭圆拟合    for (;cont;cont = cont ->h_next)    {        int i;        int count= cont->total;//轮廓个数        CvPoint center;        CvSize size;        /*个数必须大于6，这是cvFitEllipse_32f的要求*/        if (count<6)        {            continue;        }            //分配内存给点集        PointArray = (CvPoint *)malloc(count*sizeof(CvPoint));        PointArray2D32f = (CvPoint2D32f*)malloc(count*sizeof(CvPoint2D32f));            //分配内存给椭圆数据        box = (CvBox2D32f *)malloc(sizeof(CvBox2D32f));        //得到点集（这个方法值得借鉴）        cvCvtSeqToArray(cont,PointArray,CV_WHOLE_SEQ);            //将CvPoint点集转化为CvBox2D32f集合        for (i=0;i
     
      center.x);        center.y = cvRound(box->center.y);        size.width = cvRound(box->size.width*0.5);        size.height = cvRound(box->size.height*0.5);        box->angle = -box->angle;        //画椭圆        cvEllipse(image04,center,size,box->angle,0,360,CV_RGB(0,0,255),1,CV_AA,0);        free(PointArray);        free(PointArray2D32f);        free(box);    }    cvShowImage("Result",image04);}
     

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