作者CRAZYFAN (why so serious)
看板C_and_CPP
標題[問題] opencv convexhull
時間Sun Apr 12 21:07:59 2009
最近要弄一個手勢辨識的作業
所以想說用opencv的convexhull來試試看
但是結果都會怪怪的cvConvexHull2出來的結果都會有
(-858993460,-858993460)這個點
因為會抓到這個點，所以會有一些其他的點抓不到
這是在測試一些簡單contour的情況下
若是直接丟幾個點進去跑得結果倒是會正確 囧
#include "stdafx.h"
#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
#include <iostream>
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
IplImage *pImg = cvLoadImage("多邊形1.bmp", 1);
IplImage *pTmp = cvCreateImage(cvGetSize(pImg), IPL_DEPTH_8U, 1);
IplImage *pContourImg = cvCreateImage(cvGetSize(pImg), IPL_DEPTH_8U, 1);
CvMemStorage * storage = cvCreateMemStorage(0);
CvSeq *contour = cvCreateSeq(CV_SEQ_KIND_GENERIC|CV_32SC2, sizeof(CvContour), sizeof(CvPoint), storage);
// CvSeq *contour2 = cvCreateSeq(CV_SEQ_KIND_GENERIC|CV_32SC2, sizeof(CvContour), sizeof(CvPoint), storage);
CvPoint pt;
cvCvtColor( pImg, pTmp, CV_BGR2GRAY);
cvCanny(pTmp, pContourImg, 50, 150, 3);
// cvFindContours(pContourImg, storage, &contour, sizeof(CvContour), CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);
cvNamedWindow("AAA:", 1);
cvShowImage("AAA:", pContourImg);
int count = 0;
for(int i = 0; i < pContourImg->width; i++)
{
for(int j = 0; j < pContourImg->height; j++)
{
int itensity;
itensity = ((uchar*)(pContourImg->imageData + pContourImg->widthStep * i))[j];
if(itensity == 255 && j < pContourImg->width && i< pContourImg->height)
{
pt.x = j;
pt.y = i;
cout<<"("<<pt.x<<","<<pt.y<<")";
// count = count + 1;
}
cvSeqPush(contour, &pt);
}
}
/* CvPoint pt1,pt2,pt3,pt4,pt5,pt6,pt7;
pt1.x = 300;
pt1.y = 150;
cvSeqPush(contour, &pt1);
pt2.x = 240;
pt2.y = 240;
cvSeqPush(contour, &pt2);
pt3.x = 360;
pt3.y = 240;
cvSeqPush(contour, &pt3);
pt4.x = 300;
pt4.y = 200;
cvSeqPush(contour, &pt4);
pt5.x = 386;
pt5.y = 153;
cvSeqPush(contour, &pt5);
pt6.x = 440;
pt6.y = 110;
cvSeqPush(contour, &pt6);
pt7.x = 280;
pt7.y = 280;
cvSeqPush(contour, &pt7);*/
CvSeq * seq = cvConvexHull2(contour, 0, CV_CLOCKWISE, 0);
// CvSeq * seq2 = cvConvexityDefects(contour, seq1, NULL);
cout<<seq->total;
for(int i = 0; i < seq->total; i++)
{
CvPoint pt1 = **CV_GET_SEQ_ELEM(CvPoint*, seq, i);
CvPoint pt2 = **CV_GET_SEQ_ELEM(CvPoint*, seq, i+1);
cvLine(pContourImg, pt1, pt2, CV_RGB(255, 255, 255));
// pt = pt1;
cout<<"("<<pt1.x<<","<<pt1.y<<")"<<endl;
// cout<<"("<<pt0.x<<","<<pt0.y<<")"<<endl;
}
cvNamedWindow("source:", 1);
cvNamedWindow("contour:", 1);
// cvDrawContours(pContourImg, contour, CV_RGB(0,0,255), CV_RGB(255, 255, 255), 1, 1, 8);
cvShowImage("source:", pImg);
cvShowImage("contour:", pContourImg);
cvWaitKey(0);
cvDestroyWindow("source:");
cvDestroyWindow("contour:");
cvReleaseImage(&pImg);
cvReleaseImage(&pContourImg);
cvReleaseMemStorage(&storage);
system("pause");
return -1;
}
--
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