What are the core technologies behind virtual reality (VR) and augmented Reality (AR)?

AR and VR are two different concepts. The theme of Magic Leap himself to mention an HR or Mr Concept, is mixed reality. Personally thought--"Don't think I don't know you if you change your vest." "In essence, it is ar.

first of all, say a basic concept, if the difficulty of VR hardware is equivalent to making a car, then the difficulty of making AR hardware is equivalent to making a spacecraft. Why wait for me to elaborate

The main core point of VR is three
1. Full view of the virtual screen. This is just like when you use the iphone to shoot Panorama, to generate a real-time dynamic 360-degree visible world, the so-called virtual world is such a foundation. This is now easy to implement with the existing 3D game engine.

2. The virtual world and the real world synchronization. This thing sounds very mysterious, in fact, the principle is not difficult. First understand the user's head or eye rotation, if the detection of walking, but also need to detect walking distance, and then quickly and accurately respond to the virtual world. For example, the head has turned half a circle, then the virtual world of the picture should also be transferred to the corresponding angle, this is the most important VR field. It is often said that wearing a VR helmet, glasses with dizziness, this vertigo comes from the different steps. But technology is not a tall technology, in general, is the nine-axis action sensor and the corresponding algorithm, the difficulty is fast, quasi.

3. Control. This each family has each road, some is the game handle, some is the body feeling handle, does not elaborate ~

Of course there are some display parts, screen resolution and magnifying glass, but because there is no need to consider too many real environmental constraints, the home is not a big difference. There are some physical size constraints or something. Will not talk about it.

Go to AR, is a technology giant pit, AR focus on and the real world superimposed display. So

STEP1:
To perceive and analyze the real world, to display the right content in the right place, it involves computer vision, depth sensor, GPS, etc., so that the machine can understand most of the environment you see. This is Microsoft HoloLens and Magic Leap than the first Google Glass smart place.

STEP2:
Based on the near-eye reality overlay After the first step, there are two points where the AR device does not mind the size of a VR device as well. Then bring a series of problems, in the shortest distance to achieve virtual screen.

Optical Reflection,Early Google Glass is based on optical reflection, a bit of a mix of projection, reflective telescope principle, basically can achieve 3 meters outside the 40-inch screen, but also only in this size and distance, that can not really stack information to the right position. This is the only production of the current technology, this is also O.S.G open source smart glasses, the optical display starting point.

grating diffraction,This is a lumus technique that enables a thinner and smaller display by splitting the screen over multiple reflections. But the manufacturing precision is high. There is no mass production yet.

optical field Technology,Light field technology is simple and popular. Is through the calculation of different depth of the image. Through the analysis of the focal length of the human eye, the visual appearance of the virtual picture is consistent with the real picture by the way of projection. In simple terms, it is a way of imaging similar to the compound eye of insects. Currently, only Nvidia's research project, pinlights display, has been demonstrated.

There are some other techniques that don't go into the details.
Author: Rocky