Augmented reality (AR) is a live direct or indirect view of a physical, real-world environment whose elements are augmented (or supplemented) by computer-generated sensory input such as sound, video, graphics or GPS data. It is related to a more general concept called mediated reality, in which a view of reality is modified (possibly even diminished rather than augmented) by a computer. As a result, the technology functions by enhancing one’s current perception of reality. By contrast, virtual reality replaces the real world with a simulated one. Augmentation is conventionally in real-time and in semantic context with environmental elements, such as sports scores on TV during a match. With the help of advanced AR technology (e.g. adding computer vision and object recognition) the information about the surrounding real world of the user becomes interactive and digitally manipulable. Artificial information about the environment and its objects can be overlaid on the real world.
- 1 Technology
- 2 Applications
- 2.1 Archaeology
- 2.2 Architecture
- 2.3 Art
- 2.4 Commerce
- 2.5 Construction
- 2.6 Education
- 2.7 Emergency management / search and rescue
- 2.8 Everyday
- 2.9 Gaming
- 2.10 Industrial design
- 2.11 Medical
- 2.12 Beauty
- 2.13 Spatial immersion and interaction
- 2.14 Military
- 2.15 Navigation
- 2.16 Office workplace
- 2.17 Sports and entertainment
- 2.18 Task support
- 2.19 Television
- 2.20 Tourism and sightseeing
- 2.21 Translation
- 3 Notable researchers
- 4 History
- 5 See also
- 6 References
- 7 External links
Hardware components for augmented reality are: processor, display, sensors and input devices. Modern mobile computing devices like smartphones and tablet computers contain these elements which often include a camera and MEMS sensors such as accelerometer, GPS, and solid state compass, making them suitable AR platforms.
Various technologies are used in Augmented Reality rendering including optical projection systems, monitors, hand held devices, and display systems worn on one's person.
A head-mounted display (HMD) is a display device paired to a headset such as a harness or helmet. HMDs place images of both the physical world and virtual objects over the user's field of view. Modern HMDs often employ sensors for six degrees of freedom monitoring that allow the system to align virtual information to the physical world and adjust accordingly with the user's head movements. HMDs can provide users immersive, mobile and collaborative AR experiences.
AR displays can be rendered on devices resembling eyeglasses. Versions include eyewear that employ cameras to intercept the real world view and re-display its augmented view through the eye pieces and devices in which the AR imagery is projected through or reflected off the surfaces of the eyewear lens pieces.
Devices that can augment only part of ones field of view like Google Glass is are intended for an AR experience. After the debut of Google Glass many other HUD devices emerged as alternatives.
CrowdOptic, an existing app for smartphones, applies algorithms and triangulation techniques to photo metadata including GPS position, compass heading, and a time stamp to arrive at a relative significance value for photo objects. CrowdOptic technology can be used by Google Glass users to learn where to look at a given point in time.
In January 2015, Microsoft introduced HoloLens, which is an independent smartglasses unit. Brian Blau, research director of consumer technology and markets at Gartner, said that "Out of all the head-mounted displays that I've tried in the past couple of decades, the HoloLens was the best in its class.". First impressions and opinions have been generally that HoloLens is superior device to Google Glass, and manages to do several things "right" in which Glass failed.
Contact lenses that display AR imaging are in development. These bionic contact lenses might contain the elements for display embedded into the lens including integrated circuitry, LEDs and an antenna for wireless communication. Another version of contact lenses, in development for the U.S. Military, is designed to function with AR spectacles, allowing soldiers to focus on close-to-the-eye AR images on the spectacles and distant real world objects at the same time. In 2013, at the Augmented World Expo Conference, a futuristic video named Sight featuring the potential of having augmented reality through contact lenses received the best futuristic augmented reality video award.
Virtual retinal display
A virtual retinal display (VRD) is a personal display device under development at the University of Washington's Human Interface Technology Laboratory. With this technology, a display is scanned directly onto the retina of a viewer's eye. The viewer sees what appears to be a conventional display floating in space in front of them.
The EyeTap (also known as Generation-2 Glass) captures rays of light that would otherwise pass through the center of a lens of an eye of the wearer, and substitutes synthetic computer-controlled light for each ray of real light. The Generation-4 Glass (Laser EyeTap) is similar to the VRD (i.e. it uses a computer controlled laser light source) except that it also has infinite depth of focus and causes the eye itself to, in effect, function as both a camera and a display, by way of exact alignment with the eye, and resynthesis (in laser light) of rays of light entering the eye.
Handheld displays employ a small display that fits in a user's hand. All handheld AR solutions to date opt for video see-through. Initially handheld AR employed fiducial markers, and later GPS units and MEMS sensors such as digital compasses and six degrees of freedom accelerometer–gyroscope. Today SLAM markerless trackers such as PTAM are starting to come into use. Handheld display AR promises to be the first commercial success for AR technologies. The two main advantages of handheld AR is the portable nature of handheld devices and ubiquitous nature of camera phones. The disadvantages are the physical constraints of the user having to hold the handheld device out in front of them at all times as well as distorting effect of classically wide-angled mobile phone cameras when compared to the real world as viewed through the eye.
Spatial Augmented Reality (SAR) augments real world objects and scenes without the use of special displays such as monitors, head mounted displays or hand-held devices. SAR makes use of digital projectors to display graphical information onto physical objects. The key difference in SAR is that the display is separated from the users of the system. Because the displays are not associated with each user, SAR scales naturally up to groups of users, thus allowing for collocated collaboration between users.
Examples include shader lamps, mobile projectors, virtual tables, and smart projectors. Shader lamps mimic and augment reality by projecting imagery onto neutral objects, providing the opportunity to enhance the object’s appearance with materials of a simple unit- a projector, camera, and sensor.
Other applications include table and wall projections. One innovation, the Extended Virtual Table, separates the virtual from the real by including beam-splitter mirrors attached to the ceiling at an adjustable angle. Virtual showcases, which employ beam-splitter mirrors together with multiple graphics displays, provide an interactive means of simultaneously engaging with the virtual and the real. Many more implementations and configurations make spatial augmented reality display an increasingly attractive interactive alternative.
A SAR system can display on any number of surfaces of an indoor setting at once. SAR supports both a graphical visualisation and passive haptic sensation for the end users. Users are able to touch physical objects in a process that provides passive haptic sensation.
Modern mobile augmented reality systems use one or more of the following tracking technologies: digital cameras and/or other optical sensors, accelerometers, GPS, gyroscopes, solid state compasses, RFID and wireless sensors. These technologies offer varying levels of accuracy and precision. Most important is the position and orientation of the user's head. Tracking the user's hand(s) or a handheld input device can provide a 6DOF interaction technique. 
Techniques include speech recognition systems that translate a user's spoken words into computer instructions and gesture recognition systems that can interpret a user's body movements by visual detection or from sensors embedded in a peripheral device such as a wand, stylus, pointer, glove or other body wear.
The computer analyzes the sensed visual and other data to synthesize and position augmentations.
Software and algorithms
A key measure of AR systems is how realistically they integrate augmentations with the real world. The software must derive real world coordinates, independent from the camera, from camera images. That process is called image registration which uses different methods of computer vision, mostly related to video tracking. Many computer vision methods of augmented reality are inherited from visual odometry. Usually those methods consist of two parts.
First detect interest points, or fiducial markers, or optical flow in the camera images. First stage can use feature detection methods like corner detection, blob detection, edge detection or thresholding and/or other image processing methods. The second stage restores a real world coordinate system from the data obtained in the first stage. Some methods assume objects with known geometry (or fiducial markers) present in the scene. In some of those cases the scene 3D structure should be precalculated beforehand. If part of the scene is unknown simultaneous localization and mapping (SLAM) can map relative positions. If no information about scene geometry is available, structure from motion methods like bundle adjustment are used. Mathematical methods used in the second stage include projective (epipolar) geometry, geometric algebra, rotation representation with exponential map, kalman and particle filters, nonlinear optimization, robust statistics.
Augmented Reality Markup Language (ARML) is a data standard developed within the Open Geospatial Consortium (OGC), which consists of an XML grammar to describe the location and appearance of virtual objects in the scene, as well as ECMAScript bindings to allow dynamic access to properties of virtual objects.
To enable rapid development of Augmented Reality Application, some software development kits (SDK) have emerged. A few SDK such as CloudRidAR  leverage cloud computing for performance improvement. Some of the well known AR SDKs are offered by Metaio, Vuforia, Mobinett AR, Wikitude, Blippar and Layar.
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Augmented reality has many applications. First used for military, industrial, and medical applications, it has also been applied to commercial and entertainment areas.
AR can be used to aid archaeological research, by augmenting archaeological features onto the modern landscape, enabling archaeologists to formulate conclusions about site placement and configuration.
AR can aid in visualizing building projects. Computer-generated images of a structure can be superimposed into a real life local view of a property before the physical building is constructed there; this was demonstrated publicly by Trimble Navigation in 2004. AR can also be employed within an architect's work space, rendering into their view animated 3D visualizations of their 2D drawings. Architecture sight-seeing can be enhanced with AR applications allowing users viewing a building's exterior to virtually see through its walls, viewing its interior objects and layout.
AR technology has helped disabled individuals create art by using eye tracking to translate a user's eye movements into drawings on a screen. An item such as a commemorative coin can be designed so that when scanned by an AR-enabled device it displays additional objects and layers of information that were not visible in a real world view of it. In 2013, L'Oreal used CrowdOptic technology to create an augmented reality at the seventh annual Luminato Festival in Toronto, Canada.
AR can enhance product previews such as allowing a customer to view what's inside a product's packaging without opening it. AR can also be used as an aid in selecting products from a catalog or through a kiosk. Scanned images of products can activate views of additional content such as customization options and additional images of the product in its use. AR is used to integrate print and video marketing. Printed marketing material can be designed with certain "trigger" images that, when scanned by an AR enabled device using image recognition, activate a video version of the promotional material. A major difference between Augmented Reality and straight forward image recognition is that you can overlay multiple media at the same time in the view screen, such as social media share buttons, in-page video even audio and 3D objects. Traditional print only publications are using Augmented Reality to connect many different types of media.
With the continual improvements to GPS accuracy, businesses are able to use augmented reality to visualize georeferenced models of construction sites, underground structures, cables and pipes using mobile devices. Following the Christchurch earthquake, the University of Canterbury released, CityViewAR, which enabled city planners and engineers to visualize buildings that were destroyed in the earthquake. Not only did this provide planners with tools to reference the previous cityscape, but it also served as a reminder to the magnitude of the devastation caused, as entire buildings were demolished.
Augmented reality applications can complement a standard curriculum. Text, graphics, video and audio can be superimposed into a student’s real time environment. Textbooks, flashcards and other educational reading material can contain embedded “markers” that, when scanned by an AR device, produce supplementary information to the student rendered in a multimedia format. Students can participate interactively with computer generated simulations of historical events, exploring and learning details of each significant area of the event site. On higher education, there are some applications that can be used. For instance, Construct3D, a Studierstube system, allows students to learn mechanical engineering concepts, math or geometry. This is an active learning process in which students learn to learn with technology. AR can aid students in understanding chemistry by allowing them to visualize the spatial structure of a molecule and interact with a virtual model of it that appears, in a camera image, positioned at a marker held in their hand. It can also enable students of physiology to visualize different systems of the human body in three dimensions. Augmented reality technology also permits learning via remote collaboration, in which students and instructors not at the same physical location can share a common virtual learning environment populated by virtual objects and learning materials and interact with another within that setting .
This resource could also take of advantage in Primary School. Students learn through experiences, besides when children are so young, they need see to learn. For instance, they can learn new knowledge about Astronomy, which is usually difficult to acquire to them, with this device children can understand better The Solar System because they would see it in 3D; even children under 6 years old could understand it following that method. In addition, learners could change the pictures of their Science Book for using this resource. On the other hand to teach bones or organs, they could also stick one paper on their body and that paper contains an embedded “markers” about a bones or an organ that existed under the paper, and the teacher would only need to press a button when children would change the place of the paper, in this way, we would use the same embedded “markers” in order to teach another part of the body.
Children have been seen to show improvement by engagement of the use of augmented Reality. Educational leaders in the industry have explained that they have used platforms like Aurasma www.aurasma.com, Augthat www.augthat.com, daqri www.daqri.com and others to make the learning environment more "real Life".
Emergency management / search and rescue
Augmented reality systems are used in public safety situations - from super storms to suspects at large. Two interesting articles from Emergency Management magazine discuss the power of the technology for emergency management. The first is "Augmented Reality--Emerging Technology for Emergency Management" by Gerald Baron. Per Adam Crowe: "Technologies like augmented reality (ex: Google Glass) and the growing expectation of the public will continue to force professional emergency managers to radically shift when, where, and how technology is deployed before, during, and after disasters.".
Another example, a search aircraft is looking for a lost hiker in rugged mountain terrain. Augmented reality systems provide aerial camera operators with a geographic awareness of forest road names and locations blended with the camera video. As a result, the camera operator is better able to search for the hiker knowing the geographic context of the camera image. Once found, the operator can more efficiently direct rescuers to the hiker's location.
Since the 1970s and early 1980s, Steve Mann has been developing technologies meant for everyday use i.e. "horizontal" across all applications rather than a specific "vertical" market. Examples include Mann's "EyeTap Digital Eye Glass", a general-purpose seeing aid that does dynamic-range management (HDR vision) and overlays, underlays, simultaneous augmentation and diminishment (e.g. diminishing the electric arc while looking at a welding torch).
Augmented reality allows gamers to experience digital game play in a real world environment. In the last 10 years there has been a lot of improvements of technology, resulting in better movement detection and the possibility for the Wii to exist, but also direct detection of the player's movements.
AR can help industrial designers experience a product's design and operation before completion. Volkswagen uses AR for comparing calculated and actual crash test imagery. AR can be used to visualize and modify a car body structure and engine layout. AR can also be used to compare digital mock-ups with physical mock-ups for finding discrepancies between them.
Augmented Reality can provide the surgeon with information, which are otherwise hidden, such as showing the heartbeat rate, the blood pressure, the state of the patient’s organ, etc. AR can be used to let a doctor look inside a patient by combining one source of images such as an X-ray with another such as video.
Examples include a virtual X-ray view based on prior tomography or on real time images from ultrasound and confocal microscopy probes, visualizing the position of a tumor in the video of an endoscope, or radiation exposure risks from X-ray imaging devices. AR can enhance viewing a fetus inside a mother's womb. It has been also used for cockroach phobia treatment. Also, patients wearing Google Glass can be reminded to take medications.
In 2014 the company L'Oreal Paris started developing a smartphone and tablet application called "Makeup Genius", which lets users try out make-up and beauty styles utilising the front-facing camera of the endpoint and its display.
Spatial immersion and interaction
Augmented reality applications, running on handheld devices utilised as virtual reality headsets, can also digitalise human presence in space and provide a computer generated model of them, in a virtual space where they can interact and perform various actions. Such capabilities are demonstrated by "project Anywhere" developed by a post graduate student at ETH Zurich, which was dubbed as an "out-of-body experience" .
In combat, AR can serve as a networked communication system that renders useful battlefield data onto a soldier's goggles in real time. From the soldier's viewpoint, people and various objects can be marked with special indicators to warn of potential dangers. Virtual maps and 360° view camera imaging can also be rendered to aid a soldier's navigation and battlefield perspective, and this can be transmitted to military leaders at a remote command center.
An interesting application of AR occurred when Rockwell International created video map overlays of satellite and orbital debris tracks to aid in space observations at Air Force Maui Optical System. In their 1993 paper "Debris Correlation Using the Rockwell WorldView System" the authors describe the use of map overlays applied to video from space surveillance telescopes. The map overlays indicated the trajectories of various objects in geographic coordinates. This allowed telescope operators to identify satellites, and also to identify - and catalog - potentially dangerous space debris.
Starting in 2003 the US Army integrated the SmartCam3D augmented reality system into the Shadow Unmanned Aerial System to aid sensor operators using telescopic cameras to locate people or points of interest. The system combined both fixed geographic information including street names, points of interest, airports and railroads with live video from the camera system. The system offered "picture in picture" mode that allows the system to show a synthetic view of the area surrounding the camera's field of view. This helps solve a problem in which the field of view is so narrow that it excludes important context, as if "looking through a soda straw". The system displays real-time friend/foe/neutral location markers blended with live video, providing the operator with improved situation awareness.
Researchers at USAF Research Lab (Calhoun, Draper et al.) found an approximately two-fold increase in the speed at which UAV sensor operators found points of interest using this technology. This ability to maintain geographic awareness quantitatively enhances mission efficiency. The system is in use on the US Army RQ-7 Shadow and the MQ-1C Gray Eagle Unmanned Aerial Systems.
AR can augment the effectiveness of navigation devices. Information can be displayed on an automobile's windshield indicating destination directions and meter, weather, terrain, road conditions and traffic information as well as alerts to potential hazards in their path. Aboard maritime vessels, AR can allow bridge watch-standers to continuously monitor important information such as a ship's heading and speed while moving throughout the bridge or performing other tasks.
The NASA X-38 was flown using a Hybrid Synthetic Vision system that overlaid map data on video to provide enhanced navigation for the spacecraft during flight tests from 1998 to 2002. It used the LandForm software and was useful for times of limited visibility, including an instance when the video camera window frosted over leaving astronauts to rely on the map overlays. The LandForm software was also test flown at the Army Yuma Proving Ground in 1999. In the photo at right one can see the map markers indicating runways, air traffic control tower, taxiways, and hangars overlaid on the video.
AR can help facilitate collaboration among distributed team members in a work force via conferences with real and virtual participants. AR tasks can include brainstorming and discussion meetings utilizing common visualization via touch screen tables, interactive digital whiteboards, shared design spaces, and distributed control rooms.
Sports and entertainment
AR has become common in sports telecasting. Sports and entertainment venues are provided with see-through and overlay augmentation through tracked camera feeds for enhanced viewing by the audience. Examples include the yellow "first down" line seen in television broadcasts of American football games showing the line the offensive team must cross to receive a first down. AR is also used in association with football and other sporting events to show commercial advertisements overlaid onto the view of the playing area. Sections of rugby fields and cricket pitches also display sponsored images. Swimming telecasts often add a line across the lanes to indicate the position of the current record holder as a race proceeds to allow viewers to compare the current race to the best performance. Other examples include hockey puck tracking and annotations of racing car performance and snooker ball trajectories. 
AR can enhance concert and theater performances. For example, artists can allow listeners to augment their listening experience by adding their performance to that of other bands/groups of users.
The gaming industry has benefited a lot from the development of this technology. A number of games have been developed for prepared indoor environments. Early AR games also include AR air hockey, collaborative combat against virtual enemies, and an AR-enhanced pool games. A significant number of games incorporate AR in them and the introduction of the smartphone has made a bigger impact.
Complex tasks such as assembly, maintenance, and surgery can be simplified by inserting additional information into the field of view. For example, labels can be displayed on parts of a system to clarify operating instructions for a mechanic who is performing maintenance on the system. Assembly lines gain many benefits from the usage of AR. In addition to Boeing, BMW and Volkswagen are known for incorporating this technology in their assembly line to improve their manufacturing and assembly processes. Big machines are difficult to maintain because of the multiple layers or structures they have. With the use of AR the workers can complete their job in a much easier way because AR permits them to look through the machine as if it was with x-ray, pointing them to the problem right away.
Weather visualizations were the first application of Augmented Reality to television. It has now become common in weathercasting to display full motion video of images captured in real-time from multiple cameras and other imaging devices. Coupled with 3D graphics symbols and mapped to a common virtual geospace model, these animated visualizations constitute the first true application of AR to TV.
Augmented reality has also become common in sports telecasting. Sports and entertainment venues are provided with see-through and overlay augmentation through tracked camera feeds for enhanced viewing by the audience. Examples include the yellow "first down" line seen in television broadcasts of American football games showing the line the offensive team must cross to receive a first down. AR is also used in association with football and other sporting events to show commercial advertisements overlaid onto the view of the playing area. Sections of rugby fields and cricket pitches also display sponsored images. Swimming telecasts often add a line across the lanes to indicate the position of the current record holder as a race proceeds to allow viewers to compare the current race to the best performance. Other examples include hockey puck tracking and annotations of racing car performance and snooker ball trajectories.
Augmented reality is starting to allow Next Generation TV viewers to interact with the programs they are watching. They can place objects into an existing program and interact with these objects, such as moving them around. Avatars of real persons in real time who are also watching the same program.
Tourism and sightseeing
Augmented reality applications can enhance a user's experience when traveling by providing real time informational displays regarding a location and its features, including comments made by previous visitors of the site. AR applications allow tourists to experience simulations of historical events, places and objects by rendering them into their current view of a landscape. AR applications can also present location information by audio, announcing features of interest at a particular site as they become visible to the user.
AR systems can interpret foreign text on signs and menus and, in a user's augmented view, re-display the text in the user's language. Spoken words of a foreign language can be translated and displayed in a user's view as printed subtitles.
- Ivan Sutherland invented the first AR head-mounted display at Harvard University.
- Steven Feiner, Professor at Columbia University, is a leading pioneer of augmented reality, and author of the first paper on an AR system prototype, KARMA (the Knowledge-based Augmented Reality Maintenance Assistant), along with Blair MacIntyre and Doree Seligmann.
- Steve Mann formulated an earlier concept of Mediated reality in the 1970s and 1980s, using cameras, processors, and display systems to modify visual reality to help people see better (dynamic range management), building computerized welding helmets, as well as "Augmediated Reality" vision systems for use in everyday life.
- Louis Rosenberg developed one of the first known AR systems, called Virtual Fixtures, while working at the U.S. Air Force Armstrong Labs in 1991, and published the first study of how an AR system can enhance human performance. Rosenberg's subsequent work at Stanford University in the early 90's, was the first proof that virtual overlays, when registered and presented over a user's direct view of the real physical world, could significantly enhance human performance.
- Mike Abernathy pioneered one of the first successful augmented reality applications of video overlay using map data for space debris in 1993, while at Rockwell International. He co-founded Rapid Imaging Software, Inc. and was the primary author of the LandForm system in 1995, and the SmartCam3D system. LandForm augmented reality was successfully flight tested in 1999 aboard a helicopter and SmartCam3D was used to fly the NASA X-38 from 1999-2002. He and NASA colleague Francisco Delgado received the National Defense Industries Association Top5 awards in 2004.
- Francisco “Frank” Delgado is a NASA engineer and project manager specializing in human interface research and development. Starting 1998 he conducted research into displays that combined video with synthetic vision systems (called hybrid synthetic vision at the time) that we recognize today as augmented reality systems for the control of aircraft and spacecraft. In 1999 he and colleague Mike Abernathy flight-tested the LandForm system aboard a US Army helicopter. Delgado oversaw integration of the LandForm and SmartCam3D systems into the X-38 Crew Return Vehicle. In 2001, Aviation Week reported NASA astronaut’s successful use of hybrid synthetic vision (augmented reality) to fly the X-38 during a flight test at Dryden Flight Research Center. The technology was used in all subsequent flights of the X-38. Delgado was co-recipient of the National Defense Industries Association 2004 Top 5 software of the year award for SmartCam3D.
- Dieter Schmalstieg and Daniel Wagner jump started the field of AR on mobile phones. They developed the first marker tracking systems for mobile phones and PDAs.
- Bruce H. Thomas and Wayne Piekarski develop the Tinmith system in 1998. They along with Steve Feiner with his MARS system pioneer outdoor augmented reality.
- Dr. Mark Billinghurst is one of the world’s leading augmented reality researchers, focusing on innovative computer interfaces that explore how virtual and real worlds can be merged. Director of the HIT Lab New Zealand (HIT Lab NZ) at the University of Canterbury in New Zealand, he has produced over 250 technical publications and presented demonstrations and courses at a wide variety of conferences.
- Reinhold Behringer performed important early work in image registration for augmented reality, and prototype wearable testbeds for augmented reality. He also co-organized the First IEEE International Symposium on Augmented Reality in 1998 (IWAR'98), and co-edited one of the first books on augmented reality.
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- 1901: L. Frank Baum, an author, first mentions the idea of an electronic display/spectacles that overlays data onto real life (in this case 'people'), it is named a 'character marker'.
- 1957–62: Morton Heilig, a cinematographer, creates and patents a simulator called Sensorama with visuals, sound, vibration, and smell.
- 1968: Ivan Sutherland invents the head-mounted display and positions it as a window into a virtual world.
- 1975: Myron Krueger creates Videoplace to allow users to interact with virtual objects for the first time.
- 1980: Steve Mann creates the first wearable computer, a computer vision system with text and graphical overlays on a photographically mediated reality, or Augmediated Reality. See EyeTap.
- 1981: Dan Reitan geospatially maps multiple weather radar images and space-based and studio cameras to virtual reality Earth maps and abstract symbols for television weather broadcasts, bringing Augmented Reality to TV.
- 1989: Jaron Lanier coins the phrase Virtual Reality and creates the first commercial business around virtual worlds.
- 1990: The term 'Augmented Reality' is attributed to Thomas P. Caudell, a former Boeing researcher.
- 1992: Louis Rosenberg develops one of the first functioning AR systems, called Virtual Fixtures, at the U.S. Air Force Research Laboratory—Armstrong, and demonstrates benefits to human performance.
- 1992: Steven Feiner, Blair MacIntyre and Doree Seligmann present the first major paper on an AR system prototype, KARMA, at the Graphics Interface conference.
- 1993: Mike Abernathy, et al., report the first use of augmented reality in identifying space debris using Rockwell WorldView by overlaying satellite geographic trajectories on live telescope video.
- 1993 A widely cited version of the paper above is published in Communications of the ACM – Special issue on computer augmented environments, edited by Pierre Wellner, Wendy Mackay, and Rich Gold.
- 1993: Loral WDL, with sponsorship from STRICOM, performed the first demonstration combining live AR-equipped vehicles and manned simulators. Unpublished paper, J. Barrilleaux, "Experiences and Observations in Applying Augmented Reality to Live Training", 1999.
- 1994: Julie Martin creates first 'Augmented Reality Theater production', Dancing In Cyberspace, funded by the Australia Council for the Arts, features dancers and acrobats manipulating body–sized virtual object in real time, projected into the same physical space and performance plane. The acrobats appeared immersed within the virtual object and environments. The installation used Silicon Graphics computers and Polhemus sensing system.
- 1998: Spatial Augmented Reality introduced at University of North Carolina at Chapel Hill by Ramesh Raskar, Welch, Henry Fuchs.
- 1999: Frank Delgado, Mike Abernathy et al. report successful flight test of LandForm software video map overlay from a helicopter at Army Yuma Proving Ground overlaying video with runways, taxiways, roads and road names.
- 1999: The US Naval Research Laboratory engage on a decade long research program called the Battlefield Augmented Reality System (BARS) to prototype some of the early wearable systems for dismounted soldier operating in urban environment for situation awareness and training NRL BARS Web page
- 1999: Hirokazu Kato (加藤 博一) created ARToolKit at HITLab, where AR later was further developed by other HITLab scientists, demonstrating it at SIGGRAPH.
- 2000: Bruce H. Thomas develops ARQuake, the first outdoor mobile AR game, demonstrating it in the International Symposium on Wearable Computers.
- 2001: NASA X-38 flown using LandForm software video map overlays at Dryden Flight Research Center.
- 2004: High-accurate Outdoor helmet-mounted AR system demonstrated by Trimble Navigation and the Human Interface Technology Laboratory.
- 2008: Wikitude AR Travel Guide launches on 20 Oct 2008 with the G1 Android phone.
- 2009: ARToolkit was ported to Adobe Flash (FLARToolkit) by Saqoosha, bringing augmented reality to the web browser.
- 2013: Google announces an open beta test of its Google Glass augmented reality glasses. The glasses reach the Internet through Bluetooth, which connects to the wireless service on a user’s cellphone. The glasses respond when a user speaks, touches the frame or moves the head.
- 2015: Microsoft announces Windows Holographic and the HoloLens augmented reality headset. The headset utilises various sensors and a processing unit to blend high definition "holograms" with the real world.
- Alternate reality game
- Augmented browsing
- Augmented reality-based testing
- Augmented web
- Automotive head-up display
- Bionic contact lens
- Brain in a vat
- Computer-mediated reality
- Head-mounted display
- Lifelike experience
- List of augmented reality software
- Mixed reality
- Optical head-mounted display
- Simulated reality
- Transreality gaming
- Video mapping
- Visuo-Haptic Mixed Reality
- Virtual reality
- Wearable computing
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