Concert organisers in Japan have started using face recognition to ensure that tickets aren't resold on for profits.The managers of pop group Momoiro Clover Z have been using the technology at venues such as Seibu Prince Dome in Saitama Prefecture, reports the Japan Times.The system is only available for members of the group's fan club. Members must add their photo beforehand to a membership card equipped with an integrated circuit.After paying for a ticket, they need only present their card to get into the venue.The technology was developed by NEC Corp. and is being tested for use at Narita airport.