opencv 读取视频以及灰度化

int main( int argc, char** argv ) { 	//声明IplImage指针 	IplImage* pFrame = NULL;  	IplImage* pFrImg = NULL;  	CvMat* pFrameMat = NULL; 	CvMat* pFrMat = NULL; 	CvMat* pBkMat = NULL; 	CvCapture* pCapture = NULL;  	int nFrmNum = 0;  	//创建窗口 	cvNamedWindow("video", 1); 	cvNamedWindow("foreground",1); 	//使窗口有序排列 	cvMoveWindow("video", 30, 0); 	cvMoveWindow("foreground", 690, 0);   	if( !(pCapture = cvCaptureFromAVI(".\\test.avi"))) 	{ 		//pCapture = cvCaptureFromCAM(-1)) 		fprintf(stderr, "Can not open camera.\n"); 		return -2; 	}   	//逐帧读取视频 	while(pFrame = cvQueryFrame( pCapture )) 	{ 		nFrmNum++;  		//如果是第一帧，需要申请内存，并初始化 		if(nFrmNum == 1) 		{ 		 			pFrImg = cvCreateImage(cvSize(pFrame->width, pFrame->height),  IPL_DEPTH_8U,1);  		 			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, pFrImg, CV_BGR2GRAY);  			cvConvert(pFrImg, pFrameMat); 			cvConvert(pFrImg, pFrMat); 	 		} 		else 		{ 			cvCvtColor(pFrame, pFrImg, CV_BGR2GRAY); 			cvConvert(pFrImg, pFrameMat); 			//高斯滤波先，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);  			//进行形态学滤波，去掉噪音   			//cvErode(pFrImg, pFrImg, 0, 1); 			//cvDilate(pFrImg, pFrImg, 0, 1);  			//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);  			//显示图像 			pFrImg=RGBtoGRAYTmax(pFrImg,pFrame/*IplImage *out  */); 			//break; 			cvShowImage("video", pFrame); 			//cvShowImage("background", pBkImg); 			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(20) >= 0 ) 			{ 				break; 			} 		} 	} 	cvWaitKey();  	//销毁窗口 	cvDestroyWindow("video");  	cvDestroyWindow("foreground");  	//释放图像和矩阵 	cvReleaseImage(&pFrImg);   	cvReleaseMat(&pFrameMat); 	cvReleaseMat(&pFrMat);   	cvReleaseCapture(&pCapture);  	return 0; }