关于cvSetImageROI()函数的,用了程序会有错
逄123 2014-08-08 11:12:18 具体的代码如下
#include "cv.h"
#include "highgui.h"
IplImage* pFrame = NULL;
IplImage* pFrImg = NULL;
IplImage* pBkImg = NULL;
CvMat* pFrameMat = NULL;
CvMat* pFrMat = NULL;
CvMat* pBkMat = NULL;
CvCapture* pCapture = NULL;
int nFrmNum = 0;
void main()//创建窗口
{
cvNamedWindow("video",1);
cvNamedWindow("background",1);
cvNamedWindow("foreground",1);
//使窗口有序排列
cvMoveWindow("video", 30, 0);
cvMoveWindow("background", 360, 0);
cvMoveWindow("foreground", 690, 0);
pCapture = cvCaptureFromAVI("2.avi"); //读入已有视频用此句
//pCapture = cvCaptureFromCAM(0); //从摄像头读入视频用此
while(pFrame = cvQueryFrame( pCapture ))
{
cvSetImageROI(pFrame,cvRect(50,50,100,100));
nFrmNum++;
//如果是第一帧,需要申请内存,并初始化
if(nFrmNum == 1)
{
pBkImg = cvCreateImage(cvSize(pFrame->width, pFrame->height),IPL_DEPTH_8U,1);
pFrImg = cvCreateImage(cvSize(pFrame->width, pFrame->height), IPL_DEPTH_8U,1);
pBkMat = cvCreateMat(pFrame->height, pFrame->width, CV_32FC1);
pFrMat = cvCreateMat(pFrame->height, pFrame->width, CV_32FC1);
pFrameMat = cvCreateMat(pFrame->height, pFrame->width, CV_32FC1);
//转化成单通道图像再处理
cvCvtColor(pFrame, pBkImg, CV_BGR2GRAY);
cvCvtColor(pFrame, pFrImg, CV_BGR2GRAY);
cvConvert(pFrImg, pFrameMat);
cvConvert(pFrImg, pFrMat);
cvConvert(pFrImg, pBkMat);
}
else
{
cvCvtColor(pFrame, pFrImg, CV_BGR2GRAY);
cvConvert(pFrImg, pFrameMat);
//先做高斯滤波,以平滑图像
cvSmooth(pFrameMat, pFrameMat, CV_GAUSSIAN, 3, 0, 0);
//当前帧跟背景图相减
cvAbsDiff(pFrameMat, pBkMat, pFrMat);
//二值化前景图
cvThreshold(pFrMat, pFrImg, 60, 255.0, CV_THRESH_BINARY); //改阈值
//更新背景
cvRunningAvg(pFrameMat, pBkMat, 0.003, 0);
//将背景转化为图像格式,用以显示
cvConvert(pBkMat, pBkImg);
pFrame->origin = IPL_ORIGIN_BL;
pFrImg->origin = IPL_ORIGIN_BL;
pBkImg->origin = IPL_ORIGIN_BL;
cvRectangle(pFrame,cvPoint(130,100),cvPoint(180,200),cvScalar(0,0,255),1);
cvFlip(pFrame, NULL, 0);
cvShowImage("video", pFrame);
cvFlip(pBkImg, NULL, 0);
cvShowImage("background", pBkImg);
cvFlip(pFrImg, NULL, 0);
cvShowImage("foreground", pFrImg);
//如果有按键事件,则跳出循环
//此等待也为cvShowImage函数提供时间完成显示
//等待时间可以根据CPU速度调整
if( cvWaitKey(2) >= 0 )
break;
}
}
//销毁窗口
cvDestroyWindow("video");
cvDestroyWindow("background");
cvDestroyWindow("foreground");
//释放图像和矩阵
cvReleaseImage(&pBkImg);
cvReleaseImage(&pFrImg);
cvReleaseMat(&pFrameMat);
cvReleaseMat(&pFrMat);
cvReleaseMat(&pBkMat);
cvReleaseCapture(&pCapture);
}
没用cvSetImageROI()一切正常,用了之后就会出现
yidongshibie.exe 中的 0x74df812f 处有未经处理的异常: Microsoft C++ 异常: 内存位置 0x0029f6a4 处的 cv::Exception。
求大神赐教!