opencv之求各连通区域内目标的最小外接矩形及其长、宽

1、10、最小外接矩形及长宽的求法liuqingjie2#include “cv.h“ #include “highgui.h“ #include <stdio.h> #include <math.h> #include “otsu.h“int main(int argc,char* argv)iplimage *src,*gray,*bw,*dst;cvmemstorage* storage=cvcreatememstorage(0); cvseq* contour=0;char* filename=argc=2?argv1:“5.jpg“; if(!filename)p

2、rintf(“can”t open the file:%dn“,filename);src=cvloadimage(filename,1);cvnamedwindow(“image“,1); cvshowimage(“image“,src);gray=cvcreateimage(cvsize(src->width,src->height),src->depth,1); cvcvtcolor(src,gray,cv_bgr2gray);hei=gray->height;/留意此处是 gray，otsu 中要用到 hei,wid,已在otsu.h 中全局定义；wid=gra

3、y->width;printf(“图像的高为：%d,宽为：%dnn“,hei,wid);cvnamedwindow(“image2“,1); cvshowimage(“image2“,gray);bw=cvcreateimage(cvgetsize(src),ipl_depth_8u,1); otsu(gray,bw);cvnamedwindow(“image4“,1); cvshowimage(“image4“,bw);/wb=cvcloneimage(bw);/cvnot(bw,wb);只有当目标区域为黑色背景时候，才对其取反。dst=cvcloneimage(src); cvfin

4、dcontours(bw,storage,&contour,sizeof(cvcontour),cv_retr_ccomp,cv_chain_approx_simple);for(;contour!=0;contour=contour->h_next)cvbox2d rect=cvminarearect2(contour,storage); cvpoint2d32f rect_pts04;cvboxpoints(rect, rect_pts0);/由于cvpolyline 要求点集的输入类型是cvpoint*/ 所以要把 cvpoint2d32f 型的 rect_pts0转换为

5、cvpoint型的rect_pts/并赐予一个对应的指针 *pt int npts = 4,k=0;int aaa=0,bbb=0;cvpoint rect_pts4, *pt = rect_pts;printf(“连通区域最小外接矩形顶点坐标分别为:n“); for (int i=0; i<4; i+)rect_ptsi= cvpointfrom32f(rect_pts0i); printf(“%d %dn“,rect_ptsi.x,rect_ptsi.y);aaa=(int)sqrt(pow(rect_pts0.x-rect_pts1.x),2)+pow(rect_pts0.y-re

6、ct_pts1.y),2);bbb=(int)sqrt(pow(rect_pts0.x-rect_pts3.x),2)+pow(rect_pts0. y-rect_pts3.y),2);if(aaa<bbb)k=aaa; aaa=bbb; bbb=k;printf(“最小外接矩形的长为：%d，宽为：%d。nn“,aaa,bbb);/chang=rect_pts0-rect_pts3;/kuan=rect_pts0-rect_pts1;/printf(“最小外接矩形的长为：%d,宽为：%dn“,chang,kuan);/画出boxcvpolyline(dst, &pt, &npts, 1, 1, cv_rgb(255,0,0), 1);cvnamedwindow(“image5“,1); cvshowimage(“image5“,dst);cvwaitkey(0);/留意此句放的位置，放的不对则。cvdestroywindow(“image“); cvdestroywindow(“image2“); cvdestroywindow(“image4“); cvdestroywindow(“image5“);cvrele