We resented a new approach for Optical HMT (Head Motion Tracker) past years (Proc. SPIE 6955, 69550A, 2008, Proc.
SPIE 7326, 732607/73260L, 2009) -. In existing Magnetic HMT, it is inevitable to conduct pre-mapping in order to
obtain sufficient accuracy because of magnetic field's distortion caused by metallic material around HMT, such as
cockpit and helmet. Optical HMT is commonly known as mapping-free tracker; however, it has some disadvantages on
accuracy, stability against sunlight conditions, in terms of comparison with Magnetic HMT. We had succeeded to
develop new Optical HMT, which can overcome particular disadvantages by integration with two area cameras, LED
markers, image processing techniques and inertial sensors with simple algorithm in laboratory level environment (2007).
We have also reported some experimental results conducted in flight test, which proves good accuracy even in the
sunlight condition (2008).
Shimadzu Corp. and JAXA (Japan Aerospace Exploration Agency) are conducting joint research named SAVERH
(Situation Awareness and Visual Enhancer for Rescue Helicopter)
- that aims at inventing method of presenting
suitable information to the pilot to support search and rescue missions by helicopters. The Optical HMT has been
evaluated through a series of flight evaluation in SAVERH and demonstrated the operation concept. Through 16 flights
including night flights, the potential capability of the system was demonstrated and issues for further improvement were