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2 Related Work

2.1 Development and Application of Augmented Reality Definition of the Augmented Reality

Augmented reality is a form of virtual reality. Virtual reality allows users to fully integrate into the computer-generated virtual environment. We cannot see the reality of its surrounding environment. Augmented Reality allows the user to see the reality of the environment, as well as the synthesis of virtual objects in the real environment superimposed or contrasted with virtual reality. Therefore, Augmented Reality augments real environment rather than completely replaces real environment. Augmented reality has the following three characteristics: combination of real and virtual, realtime interactivity, and three-dimensions [1].

Principle of the Augmented Reality

Real and virtual images are combined and displayed to the user on the small screen inside the helmet [1, 2]. The equipment and technology, coupled with immaturity, high cost, inconvenience to carry, cannot be accepted for general users. But the popularity of PC and network cameras makes a new way to achieve augmented reality. Use a webcam to identify the real environment. The video is output to PC monitors. Hardware price in this mode of operation is quite cheap. Therefore the popularity of augmented reality increases [3]. Another paper describes an RF-based approach to mobile augmented reality [4].

Because of the rapid development of mobile devices, augmented reality has extended from personal computers to mobile devices. The highly interactive nature of augmented reality with its user has given rise to various augmented reality applications for mobile devices [5]. AR can be used in handheld games, it has more novel play experience for people [6]. After integrating the virtual and real world, it can improve the convenience for people. AR can be used in classroom as teaching tool. A study analysis by the use of the AR book in classroom indicates that the interaction can strengthen the study result for all ages [7]. The authors research how augmented reality can increase the selective and sustained attention of children with autism during object discrimination therapies and elicit more positive emotions [8].

There are several SDKs and platforms to realize augmented reality. Qualcomm Vuforia [9] is a software platform for Android, iOS, and package for Unity3d [23] that enables app to recognize mark from a Vuforia target database or in the Vuforia Cloud Recognition Service. It allows users to track objects such as two-dimensional planar mark, three-dimensional cube, and cylinder-shape object. It also supports realtime text recognition. ARtag and ARtoolkit are C/C++ open source platforms which support tracking 2D mark and displaying openGL [10]. BazAR is a computer vision library based on matching and feature point detection. In particular, it is able to quickly detect and register known planar objects in images [11].

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