Hi Berezkin,
Thank you for your update.
We have already implemented the method called ToImage() and ToImage(Size) for SfBarcode. You can use this method to convert the barcode as image.
Please find the below code snippet,
QRBarcode barcode = new QRBarcode();
System.Windows.Media.Imaging.BitmapSource image = barcode.ToImage();
Please find the sample here,
Please let us know if you need any further assistance.
With Regards,
Gayathri R