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while (b_scanning)
{
cap >> frame;
cvtColor(frame, imageGray, CV_RGB2GRAY);//这是转换
ret = QRCode::GetQR(imageGray);//这是识别二维码
if (!ret.empty())
{
b_scanning = FALSE;
}
imshow("view", frame);//这个是显示
waitKey(30);
}