I’m surprised that someone finally decided to make something like this. Students at Digital Media Design Dept at Hongik University in Korea have made what they call an Emotion mask.
This mask will project facial expressions in the similar emoticons computer users use. After some digging, it doesn’t seem like the mask translates the facial expression of the wearer. But now that I think about it, that would defeat the purpose of a mask like this. The user chooses from a preset 7 different emotions.