public IObservable <IplImage> Process(IObservable <IplImage> source)
{
return(source.Select(input =>
{
var offset = Offset;
var copyOffset = new Point(Math.Max(0, offset.X), Math.Max(0, offset.Y));
var size = new Size(input.Width + Math.Abs(offset.X), input.Height + Math.Abs(offset.Y));
Arr output = new IplImage(size, input.Depth, input.Channels);
CV.CopyMakeBorder(input, output, copyOffset, BorderType, FillValue);
output = output.GetSubRect(new Rect(
Math.Max(0, -offset.X),
Math.Max(0, -offset.Y),
input.Width,
input.Height));
return output.GetImage();
}));
}