I’m not certain if you are aware of this, but Singapore’s Agency for Science, Technology, and Research (A*Star) has developed gender recognition system.
This picture here from CommunicAsia 2009 gives you an idea of the technology with the webcam and the mirror. You will note the surprise on this guys face as the computer knows that “You Got Male”.
The tech is some sort sophisticated algorithm in order to differentiate facial features between males and females. So its not looking at any anatomy below the neck or anything, otherwise Robert Paulson from Fight Club would be mislabeled. This is probably a good time for a joke about how this new technology would label an individual who has received a sex-change operation.
Unfortunately, this tech only works if someone is actually facing the camera. However, this gender recognition system is still in beta testing, but A*Star hopes to have a better version out soon.
Some may wonder what use this technology is. Apparently, someone wants to design billboards that can detect your gender. This way they know how to market to you. So if you are a man, you will see ads for male performance enhancements. And if you are female, you will see ads for female performance enhancements, I guess.