OPENCV外接矩形及长宽的求法

#include "cv.h"

#include "highgui.h"

#include

int main()

{

CvMemStorage* storage=cvCreateMemStorage(0);

CvSeq* contour=0;

//获取连通区域指针存储在contour

cvFindContours(img,storage,&contour,sizeof(CvContour),CV_RETR_CCOM P,CV_CHAIN_APPROX_SIMPLE);

//遍历每个连通区域

for(;contour!=0;contour=contour->h_next)

{

//求连通区域最小外接矩形的四个顶点

CvBox2D rect=cvMinAreaRect2(contour,storage);

CvPoint2D32f rect_pts0[4];

cvBoxPoints(rect, rect_pts0);

intnpts = 4;

CvPointrect_pts[4], *pt = rect_pts;

for (int i=0; i<4; i++)

{

rect_pts[i]= cvPointFrom32f(rect_pts0[i]);

}

//在图像中绘制

cvPolyLine( img, &pt, &npts, 1, 1, CV_RGB(255,255,255), 1);

}

}

//以下是获取连通区域的水平外接矩形，不一定是最小的

CvRect r = ((CvContour*)(contour))->rect;

cvRectangle(image,cvPoint(r.x,r.y),cvPoint(r.x+r.width,r.y+r.height), CV_RGB(255,255,255),0);