OpenCV学习之由点集序列或者数组创建凸外形

由点集序列或者数组创建凸外形

#include "cv.h"#include "highgui.h"  #define ARRAY 0  int main(){    IplImage* img = cvCreateImage(cvSize(500, 500), 8, 3);    cvNamedWindow("hull", 1);#if ! ARRAY      CvMemStorage* storage = cvCreateMemStorage(0);#endif      int i;    int contour = rand() % 100 + 1;    int hullcontour;    CvPoint pt0;#if ! ARRAY      CvSeq* ptseq = cvCreateSeq(CV_SEQ_KIND_GENERIC | CV_32SC2, sizeof(CvContour), sizeof(CvPoint), storage);    CvSeq* hull;    for (i = 0; i < contour; i++)    {        pt0.x = rand() % (img->width / 2) + img->width / 4;        pt0.y = rand() % (img->height / 2) + img->height / 4;        cvSeqPush(ptseq, &pt0);    }    hull = cvConvexHull2(ptseq, 0, CV_CLOCKWISE, 0);    /*hull = cvConvexHull2 (ptseq, 0, CV_CLOCKWISE, 1);*/    hullcontour = hull->total;#else      CvPoint* points = (CvPoint*)malloc(contour * sizeof(points[0]));    int* hull = (int*)malloc(contour * sizeof(hull[0]));    CvMat point_mat = cvMat(1, contour, CV_32SC2, points);    CvMat hull_mat = cvMat(1, contour, CV_32SC1, hull);    for (i = 0; i < contour; i++)    {        pt0.x = rand() % (img->width / 2) + img->width / 4;        pt0.y = rand() % (img->height / 2) + img->height / 4;        points[i] = pt0;    }    cvConvexHull2(&point_mat, &hull_mat, CV_CLOCKWISE, 0);    hullcontour = hull_mat.cols;#endif      cvZero(img);    for (i = 0; i < contour; i++)    {#if ! ARRAY          pt0 = *CV_GET_SEQ_ELEM(CvPoint, ptseq, i);        /*pt0 = ** CV_GET_SEQ_ELEM(CvPoint*, ptseq, i);*/#else          pt0 = points[i];#endif          cvCircle(img, pt0, 2, CV_RGB(255, 0, 0), CV_FILLED);    }#if ! ARRAY      pt0 = ** CV_GET_SEQ_ELEM(CvPoint*, hull, hullcontour - 1);    /*pt0 = * CV_GET_SEQ_ELEM(CvPoint, hull, hullcontour - 1);*/#else      pt0 = points[hull[hullcontour - 1]];#endif      for (i = 0; i < hullcontour; i++)    {#if ! ARRAY          CvPoint pt = **CV_GET_SEQ_ELEM(CvPoint*, hull, i);        /*CvPoint pt = *CV_GET_SEQ_ELEM(CvPoint, hull, i);*/#else          CvPoint pt = points[hull[i]];#endif          cvLine(img, pt0, pt, CV_RGB(255, 0, 0));        pt0 = pt;    }    cvShowImage("hull", img);    cvWaitKey(0);#if ! ARRAY       cvClearMemStorage(storage);#else      free(points);    free(hull);#endif      return 0;}