opencv之求各连通区域内目标的最小外接矩形及其长、宽(共4页)

1、精选优质文档-倾情为你奉上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* file

2、name=argc=2?argv1:"5.jpg"if(!filename)printf("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

3、_BGR2GRAY); hei=gray->height;/注意此处是gray，otsu中要用到hei,wid,已在otsu.h中全局定义；wid=gray->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("imag

4、e4",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);cvFindContours(bw,storage,&contour,sizeof(CvContour),CV_RETR_CCOMP,CV_CHAIN_APPROX_SIMPLE); for(;contour!=0;contour=contour->h_next)CvBox2D rect=cvMinAreaRect2(conto

5、ur,storage);CvPoint2D32f rect_pts04;cvBoxPoints(rect, rect_pts0);/因为cvPolyLine要求点集的输入类型是CvPoint*/所以要把 CvPoint2D32f 型的 rect_pts0 转换为 CvPoint 型的 rect_pts/并赋予一个对应的指针 *ptint 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+)re

6、ct_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-rect_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：

7、%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);/注意此句放的位置，放的不对则。cvDestroyWindow("image");cvDestroyWindow("image2");cvDestroyWindow("image4");cvDestroyWindow("image5")