Characteristics
of Augmented Reality
1)
Combines real and virtual;
2)
Interactive in real time; and
3)
Registered in 3-D.
AR
Components
Scene
Generator
The scene
generator is the device or software responsible for rendering the scene.
Rendering is not currently one of the major problems in AR, because a few
virtual objects need to be drawn, and they often do not necessarily have to be
realistically rendered in order to serve the purposes of the application.
Tracking
System
The
tracking system is one of the most important problems on AR systems mostly
because of the registration problem. The objects in the real and virtual worlds
must be properly aligned with respect to each other, or the illusion that the
two worlds coexist will be compromised. For the industry, many applications
demand accurate registration, specially on medical systems.
Display
The
technology for AR is still in development and solutions depend on design decisions.
Most of the Displays devices for AR are HMD (Head Mounted Display). When
combining the real and virtual world two basic choices are available: optical
and video technology. Each of them has some tradeoffs depending on factors like
resolution, flexibility, field-of-view, registration strategies, among others.
Display technology continues to be a limiting factor in the development of AR
systems. There are still no see-through displays that have sufficient
brightness, resolution, field of view, and contrast to seamlessly blend a wide
range of real and virtual imagery. Furthermore, many technologies that begin to
approach these goals are not yet sufficiently small, lightweight and low-cost.
Nevertheless, the past few years have seen a number of advances in see-through
display technology, as we shall see next.
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