Facial recognition technology has many applications such as providing alerts in driving, enabling feedback systems for e-learning, and aiding in medical practices and psychological research. It works by detecting emotion signatures - unique patterns in facial action units like eyebrows, eyes, nose and lips that indicate specific emotions. Consumers are demanding more interactive systems, and facial recognition meets this need by allowing analysis of real-time facial expressions to provide feedback. The budget for developing such a system would be approximately $50,000.