RecognizeMe is the first ever Facial Recognition for iOS. Recognize me works with all iOS 4.x+, and sits on the passcode lock screen. RecognizeMe uses the Front Facing camera on the iPhone 4 and iPod Touch 4th Gen (also, it works well with the iPad 2, when ever a jailbreak is found!) Simply train using the included App, making sure to have even light on your face, configure a lockscreen passcode, and you're good to go! Threshold for verification is adjustable, and you can add/remove biometric sets at any time. (I find 3 sets optimal, with even light on the face in low, medium, and high light conditions)
A Training and Settings app will be added to your home screen.