Just a quick follow-up on Diminished Reality,
Rover just announced a prototype featuring an ‘invisible bonnet’: http://www.telegraph.co.uk/motoring/car-manufacturers/land-rover/10752488/Land-Rovers-invisible-bonnet-technology.html which allows the driver to see the road or track conditions through the hood of his car.
This reminded me of the next-generation HMDs in fighter jets, such as the F-35. Northrop Grumman developed a ‘Distributed Aperture System‘, which provides full 360 degree (or more correctly: full hemispherical) vision through distributed cameras. The images are displayed on the helmet’s visor and depend on the pilot’s head position, so the pilot is able to see through the floor of the aircraft. However, integrating this system is quite complex and it has been named as one of the major risk factors for success in this already way-over-budget project.