问题描述
- opencv初学者 为什么调用摄像头 怎么出现捕获源什么框框的。。。
-
这是调用的那个cpp代码
/*打开摄像头,通过摄像头进行实时人数统计*/#include "peoplecounting.h"
#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
#include "cvaux.h"
#include "cxcore.h"#include
#include
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using namespace std;void peoplecounting::SelectTheCamera()
{
//初始化内存及分类器
static CvMemStorage* storage = 0;
static CvHaarClassifierCascade* cascade = 0;//加载分类器,名称为"xml.xml" const char* cascade_name="C:/Users/kjyszylkj/Desktop/460518377Count/Count/Count/xml.xml"; cascade = (CvHaarClassifierCascade*)cvLoad( cascade_name, 0, 0, 0 ); if( !cascade ) { QMessageBox::information( 0, "错误", "不能加载分类器", QMessageBox::Ok); } //定义某一帧的图片、灰度图及haar图 IplImage* pFrame = NULL; IplImage* pHaarImg = NULL; IplImage* pGrayImg = NULL; int nFrmNum = 0; cvNamedWindow("camera",1); cvMoveWindow("camera",30,0); //打开自带摄像头 CvCapture* pCapture = cvCreateCameraCapture(-1); if(!(pCapture)) { QMessageBox::information( 0, "错误", "不能打开摄像头", QMessageBox::Ok); } else { while(pFrame = cvQueryFrame(pCapture)) //如果能够捕获到视频 { nFrmNum++; //如果这是第一帧视频,需要申请内存并初始化 if(nFrmNum == 1) { pGrayImg = cvCreateImage(cvSize(pFrame->width,pFrame->height),8,1); pHaarImg = cvCreateImage(cvSize(cvRound(pFrame->width/1.1),cvRound(pFrame->height/1.1)),8,1); //转化为灰度图像再处理 cvCvtColor(pFrame, pGrayImg,CV_BGR2GRAY); //缩放灰度图像 cvResize(pGrayImg,pHaarImg,CV_INTER_LINEAR); } else { cvGrabFrame(pCapture); //抓取一帧 pFrame = cvRetrieveFrame(pCapture); //将图像从缓存中转换为IplImage存在pFrame中 //转化为灰度图像 cvCvtColor(pFrame,pGrayImg,CV_BGR2GRAY); //缩放灰度图像 cvResize(pGrayImg, pHaarImg,CV_INTER_LINEAR); //直方图均衡化 cvEqualizeHist(pHaarImg,pHaarImg); //分配内存空间 storage = cvCreateMemStorage(0); //人数统计 if(cascade) { //检测窗口每次放大1.1倍 double scale = 1.1; int i; //使用分类器进行人脸检测 CvSeq* PeopleCounting = cvHaarDetectObjects( pHaarImg, cascade, storage, scale, 2, 0/*"CV_HAAR_DO_CANNY_PRUNING"*/, cvSize(30,30) ); //在检测到的人脸上画出红色圆圈标记 for(i=0;i<(PeopleCounting?PeopleCounting->total:0);i++) { CvRect* r = (CvRect*)cvGetSeqElem(PeopleCounting,i); //返回矩形的信息 CvPoint center; int radius; center.x = cvRound((r->x + r->width*0.5)*scale); //圆心横坐标 center.y = cvRound((r->y + r->height*0.5)*scale); //圆心纵坐标 radius = cvRound((r->width + r->height)*0.25*scale); //半径 cvCircle(pFrame, center, radius, CV_RGB(255,0,0), 3, 8, 0 ); //(图像,圆心,半径,颜色,粗细,线条类型,小数点位数) } //将人数的个数显示到主窗口 int number; number = PeopleCounting->total; QString tmp; tmp = QString("副窗口画面中一共有%1个人").arg(number); //文字信息 ui->textEdit->setText(QString(tmp)); //设置文字信息 ui->textEdit->setAlignment( Qt::AlignCenter ); //设置文字居中 } //显示每一帧的图像 cvShowImage("camera",pFrame); char key = cvWaitKey(1000); } } //释放图像 cvReleaseImage(&pFrame); cvReleaseImage(&pHaarImg); cvReleaseImage(&pGrayImg); cvWaitKey(0); //销毁窗口 cvDestroyWindow("camera"); //释放摄像头 cvReleaseCapture(&pCapture); }
}
各位大侠求救!!!
解决方案
http://blog.csdn.net/augusdi/article/details/8762961
解决方案二:
使用OpenCV在开启摄像头前,是有方法可以获得当前计算机中可用摄像头的,每个摄像头都有一个编号和一个对应的名字,而在连接的时候,是通过编号来打开对应的摄像头的,默认是第0个
时间: 2024-10-31 21:32:44