C++实现视频流转换为图片方式

/*  avi2jpg 函数，将摄像头当前帧保存为jpg格式照片 */ void Video_to_image(CvCapture* capture){	//初始化一个视频文件捕捉器	//CvCapture* capture = cvCaptureFromAVI(filename);	//获取视频信息	cvQueryFrame(capture);	/*	int frameH  = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT);	int frameW  = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH);	int fps    = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);	int numFrames = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_COUNT);	//printf("tvideo height : %dntvideo width : %dntfps : %dntframe numbers : %dn", frameH, frameW, fps, numFrames);	*/	//定义和初始化变量	int i = 0;	IplImage* img = 0;	char image_name[13] = "1";	//读取和显示	while(1)	{		img = cvQueryFrame(capture); //获取一帧图片		char key = cvWaitKey(20);		sprintf(image_name, "%s%d%s", "image", ++i, ".jpg");//保存的图片名		cvSaveImage( image_name, img);  //保存一帧图片		if(i == NUM_FRAME) break;	}}