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读取usb摄像头并按帧保存
说明:
1.运行后在“usb video”窗口中按“s”开始按帧保存图像,按“q”结束。
2.设备编号根据实际情况设定,我的电脑默认摄像头为0,usb摄像头为3。
3.由于usb摄像头初始化较电脑默认摄像头慢,所以在循环前加入了Sleep()语句,不然有可能出现“usb video”窗口灰屏无法读取的情况。使用Sleep()语句需要包含头文件windows.h。
void videoCap()
{
VideoCapture usbCap(3);
if (!usbCap.isOpened())
{
cout << "Cannot open the camera" << endl;
}
int i = 0;
char imgName[100];
namedWindow("usb video", WINDOW_NORMAL);
bool start = false;
bool stop = false;
Sleep(1000);
while (!stop)
{
Mat frame;
usbCap >> frame;
imshow("usb video", frame);
if ((waitKey(30) == 's') || start)
{
start = true;
sprintf(imgName, "%s%d%s", "img", ++i, ".jpg");
imwrite(imgName, frame);
if (waitKey(30) == 'q')
stop = true;
}
}
}
读取视频并按帧保存
void videoRead()
{
VideoCapture capture("1.avi");
if (!capture.isOpened())
cout << "error reading" << endl;
char imgName [100];
int i = 0;
Mat frame;
cvNamedWindow("video", CV_WINDOW_NORMAL);
bool stop = false;
while (!stop)
{
if (!capture.read(frame))
break;
imshow("video", frame);
int key = waitKey(30);
sprintf(imgName, "%s%d%s", "img", ++i, ".jpg");
imwrite(imgName, frame);
}
}