Computer Scientists from Freie
Universität Berlin Present Novelty at IFA
(September 2, 2011) Computer scientists from Freie Universität
Berlin demonstrated a new type of wheelchair at IFA, an international trade
fair for home electronics. The wheelchair, on loan from the Otto Bock company,
makes it significantly easier to navigate inside buildings. It is equipped with
laser and camera sensors and a computer under the seat. Laser sensors detect
the position of walls and obstacles and prevent collisions. A so-called Kinect,
developed for Microsoft Xbox 360 game consoles, is also mounted on the
wheelchair. The sensor detects the three-dimensional structure of the
environment and can, for example, prevent the collision of the wheelchair with
people. Demonstrations and explanations are available in videos on YouTube.
A camera is installed for
steering using eye movements. To cause the wheelchair go to the right or left,
the user needs only to glance toward the right or left. Accelerating and
braking are triggered by looking upward or downward. For steering by thought,
the wheelchair user wears a cap with 16 sensors that continuously measure brain
activation. The system is trained to distinguish four brain patterns: drive
left, drive right, accelerate, and brake. After a training period, the user
should be able to steer the wheelchair just by thinking. A great deal of
concentration is required, as ideally the user should think of only the four
practiced patterns the entire time. Since obstacles automatically cause the
wheelchair to stop, the person remains accident-free in any case. Previously,
the group had demonstrated steering a car using only brain power.