'Help me find my Doppelganger'
6 March 2013 Last updated at 00:28 GMT
Sophie Robehmed is on a personal quest to find her doppelganger, the person in the world who most closely resembles her.
She has been using a blog and other internet forums in her endeavour.
With BBC News she visited Aurora, a British firm that specialises in facial recognition software, to see how it could help her.
Video Journalist: Dougal Shaw