| private cvQueryFrame ( IntPtr capture ) : IntPtr | ||
| capture | IntPtr | |
| Результат | IntPtr | |
/// <summary>
/// Capture a Gray image frame
/// </summary>
/// <returns> A Gray image frame</returns>
public virtual Image <Gray, Byte> QueryGrayFrame()
{
IntPtr img = CvInvoke.cvQueryFrame(Ptr);
MIplImage iplImage = (MIplImage)Marshal.PtrToStructure(img, typeof(MIplImage));
Image <Gray, Byte> res;
if (iplImage.nChannels == 3)
{ //if the image captured is Bgr, convert it to Grayscale
res = new Image <Gray, Byte>(iplImage.width, iplImage.height);
CvInvoke.cvCvtColor(img, res.Ptr, Emgu.CV.CvEnum.COLOR_CONVERSION.CV_BGR2GRAY);
}
else
{
res = new Image <Gray, byte>(iplImage.width, iplImage.height, iplImage.widthStep, iplImage.imageData);
}
//inplace flip the image if necessary
res._Flip(FlipType);
return(res);
}
/// <summary>
/// Capture a Bgr image frame
/// </summary>
/// <returns> A Bgr image frame</returns>
public virtual Image <Bgr, Byte> QueryFrame()
{
#if TEST_CAPTURE
Image <Bgr, Byte> tmp = new Image <Bgr, Byte>(320, 240, new Bgr());
MCvFont font = new MCvFont(CvEnum.FONT.CV_FONT_HERSHEY_PLAIN, 1.0, 1.0);
tmp.Draw(System.DateTime.Now.Ticks.ToString(),
ref font,
new Point(10, 50),
new Bgr(255.0, 255.0, 255.0));
IntPtr img = tmp;
#else
IntPtr img = CvInvoke.cvQueryFrame(Ptr);
#endif
if (img == IntPtr.Zero)
{
return(null);
}
MIplImage iplImage = (MIplImage)Marshal.PtrToStructure(img, typeof(MIplImage));
Image <Bgr, Byte> res;
if (iplImage.nChannels == 1)
{ //if the image captured is Grayscale, convert it to BGR
res = new Image <Bgr, Byte>(iplImage.width, iplImage.height);
CvInvoke.cvCvtColor(img, res.Ptr, Emgu.CV.CvEnum.COLOR_CONVERSION.CV_GRAY2BGR);
}
else
{
res = new Image <Bgr, byte>(iplImage.width, iplImage.height, iplImage.widthStep, iplImage.imageData);
}
//inplace flip the image if necessary
res._Flip(FlipType);
return(res);
}
