Key technologies for augmented reality

1. Tracking registration technology

In order to realize the seamless superposition of virtual information and real scene, it requires the registration of virtual information and real environment in the three-dimensional space.This includes users' spatial location tracking and virtual object positioning in real space.The location of mobile device cameras and virtual information needs to be corresponding, which needs to be achieved through tracking technology.The tracking registration technology first detects the object feature points and contours that need to be 'enhanced', and automatically generates 2d or 3d coordinate information by tracking the object feature points.The quality of tracking registration technology directly determines the success of the augmented reality system. There are four common tracking registration methods: registration based on tracker, registration based on machine vision tracking, and hybrid tracking registration based on wireless network

2. Display technology

Augmented reality display system is the important content, in order to be able to obtain a true combination of virtual system, makes the actual application convenience, use more colorful display is the important foundation, on the basis of this, the display contains the helmet and the helmet display equipment and other related content, the perspective of type of helmet can provide users with relevant reverse together situation, these systems in the process of concrete operation, the principle of operation and immersion in the field of virtual reality helmet similar degree between the content such as more advanced.Its interact with the user interface and image together, such as using more real and effective environment for its application in the form of miniature cameras, photographs of the external environment, make the computer image in the process of effectively, can and the virtual and real environment together, and between the two images are also able to stack.On this basis, the optical perspective helmet display can make use of the semi-transparent and semi-reflective optical synthesizer installed in front of the user, fully integrated with the real environment. The real scene can provide support for the user on the basis of semi-lens, and meet the user's relevant operational needs.

3. Virtual object generation technology

When the application of augmented reality technology, its goal is to make the relevant content of the virtual world get superimposed processing in the real world, and effectively realize the dynamic operation of objects on the basis of the application of algorithm programs.At present, the generation of virtual objects is realized on the basis of 3d modeling technology, which can fully reflect the reality of virtual objects. In the process of research and development of the dynamic model of augmented reality, it is necessary to display objects in an all-round and collectivized way.Virtual object in the process of generation, natural interaction is one of the important technical content, the specific implementation, for the effective implementation of the reality technology effective auxiliary, make information registration better implementation, using the image tag real-time monitoring external input information content, makes the augmented reality to enhance the operation efficiency of information, and the user at the time of information processing, can effectively achieve the contents of the information processing, the extraction of useful information.

4. Interactive technology

Different from real life, augmented reality is to present virtual things in reality, while interaction is to help virtual things to better present in reality. Therefore, if we want to wait for better AR experience, interaction is the most important thing.

The interaction modes of AR devices are mainly divided into the following three types:

(1) spot selection in the real world is the most common way of interaction. For example, AR greeting CARDS and graduation albums are recently popular, which are interactive through picture location. 

(2) judge the specific postures or states of one or more objects in space, and these postures correspond to different commands.Users can interact by changing and using commands at will, such as using different gestures to represent different commands.

(3) use special tools for interaction.For example, Google earth USES something similar to a mouse to perform a series of operations to meet users' requirements for AR interaction.

5. Merge technologies

The goal of augmented reality is the reality of the virtual information input scene seamlessly combine together, in order to increase the reality of the AR user experience, require AR has a strong sense of reality, in order to achieve this goal is not only consider the positioning of the virtual things, also need to consider virtual things and real things and meet four conditions: the shade of relationship between the geometric model is consistent, true, consistent light and tonal and consistent, these four short of one cannot, the lack of any a kind of can cause AR effect is not stable, which seriously influence the experience of AR.