How are Faces Encoded for Image Recognition?

[WWGD]

Hi all,
I think I have an idea of how the Mathematical aspects of Face recognition work. But I am curious as to what an eigenvector would be in this respect. I am trying to understand it through finding out how pixels are encoded: What map takes a pixel into a collection of numbers/vector/matrix?
Thanks.

 

[scottdave]

I've heard of this but not tried the process. You might want to check out this article. https://jeremykun.com/2011/07/27/eigenfaces/