No! this post is not about the dragon from the animated movie (although it's one of my favourite). However this picture explains almost everything there is about the topic. For those of you who have seen this movie, computer vision machines can be thought to be like the dragon which can not fly. You have to train it about every single incident and how it should react to each one of them in order to fly.
Yup! that's right, this post is about training. Training a computer!