The head-mounted display used in augmented reality systems will enable the user to view superimposed graphics and text created by the system. As of today, the technology nearest to augmented reality head mounts is one that is being used in virtual reality applications.
There are two basic head mount design concepts that are being researched for augmented reality systems and these are the video see-through systems and optical see-through systems.
The video see-through systems block out the user's view of the outside environment and play the image real time through a camera mounted on the head gear. The main problem with this type of system is the delay in image adjustment whenever the user moves his head.
Optical see-through systems, on the other hand, make use of technology that "paints" the images directly onto the user's retina through rapid movement of the light source. Though this system has its drawbacks, particularly its high price, researchers are confident that this system will be a lot more portable and less inconspicuous for future augmented reality systems.
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