[ame=http://www.youtube.com/watch?v=NBpsK89e8h0]YouTube - ‪REAL Facial Recognition For iPhone & iPod Touch With RecognizeMe - iOS Vlog 408‬‏[/ame]
RecognizeMe is a tweak that will allow you to access your iDevice with only your face and its contents. You start off by training your face by having the app scan your features with the front facing camera, and save them within the app. Afterwards you can change some settings like the sensitivity / threshold and you can also delete sets that you don't need. When you get to your Slide To Unlock screen, you can either put in the passcode or tap the RecognizeMe button at the top. This will enable scanning and your front facing camera so DON'T MOVE! After a few seconds, it will either let you enter your device or lock you back out. This is a great start for facial recognition software, hopefully it will get even better with updates! Check out RecognizeMe in Cydia for $6.99.