- N this research we are concerned with one way communication in which a human commands a machine through gestures. The machine recognizes and responds to the gesture carrying out some defined action. Our gesture control vocabularies are in contrast other forms such as sign language for human human communication. Thus, our domain of application is human machine communication, as opposed to human human communication. There are two major aspects of human machine communication through the use of gestures. The first is human based, and the second is machine based. Human based aspects are learnability and memorability of the gestures  while the machine based aspect involves pattern recognition algorithms. Gestures good for one may not be good for the other.