title: how to hash facial recognition eigenvalues and store in a database to compare with later
body: <p>I'm grabbing face images from a camera, and storing each face frame until there are enough images to train the eigenface object in opencv. I'm able to get a mean eigenface, but i'm wondering how i could store this into a database on a server so that later when a person comes back, i could get another mean eigenface, send that to the server and find the closest match. I was thinking of either hashing that eigenface and comparing hashes, but i could just store that mean eigenface itself in the database, but i don't know how i would compare the eigenface on the client with all the eigenfaces in a database without pulling every single record down from the database.</p>
  
  <p>Does anybody have any idea how i might turn the eigenvalues or mean eigenface into a string or number of some kind which i could compare the mean eigenface value with the values in the database on the server?</p>