In this video, I implemented Person Authentication using Face detection and recognition using C# and Emgu (OpenCV wrapper for .NET) and PIC microcontroller or Arduino connected to serial port.
The tutorials that help me to do this project :
See this channel "best channel to learn opencv" :
and see my videos about serial communications with c#:
How to make a C# program sends data from PC to PIC via Serial Port ?
How to make a C# program receives data from PIC to PC via Serial Port ?