First of all, a basic concept, if the difficulty of VR hardware manufacturing is equivalent to making a car, then the difficulty of making AR hardware is equivalent to building a spaceship. And listen to Weibo Jun slowly said ~
The main core of VR is three
1. Virtual view of full view. This is like taking a panoramic view with IPHONE. To create a real-time dynamic 360-degree visible world, the so-called virtual world is such a foundation. This is currently easy to implement with an existing 3D game engine.
2. Synchronization of the virtual world and the real world. This thing sounds more mysterious, but the principle is not difficult. First, understand the rotation of the user's head or eyes. If there is detection of walking, you need to detect the walking distance and then quickly and accurately respond to the virtual world. For example, if the head turns a half circle, then the picture in the virtual world should also be turned to the corresponding angle. This is the most important aspect in the current VR field. People often say that when wearing a VR helmet and glasses, there is a sense of dizziness. This vertigo comes from being out of sync. But technology is not a high-tech, comprehensively speaking, is the nine-axis motion sensor and the corresponding algorithm, the difficulty is fast and accurate.
3. Control. This family has various roads, some are game controllers, some are somatosensory handles, don’t elaborate~
Of course, there are some display parts, screen resolution and magnifying glass, but because there is no need to consider too many real-world constraints, there is no big difference between the families. There are also some physical sizes that restrict what. I won't talk about it.
Head-mounted VR glasses
Going to AR is a huge technology pit, and AR's focus is on superimposed display with the real world. Then
STEP1:
To perceive and analyze the real world, to display the right content in the right position, it involves computer vision, depth sensor, GPS, etc. The purpose is to let the machine understand most of the environment you see. This is the sagacity of Microsoft Hololens and Magic Leap than the earliest google glass.
STEP2:
Based on the near-eye reality overlay after the first step, there are two points, and the AR device cannot be as big as the VR device. Then it brings a series of problems and realizes virtual pictures in the shortest distance.
Optical reflection, the early Google glass is based on optical reflection, a little mixed with the principle of projection, reflective telescope, basically can achieve a picture of about 40 meters away from 40 meters, but only in this size and distance, then it can not really The information is superimposed to the right position. This is currently the only mass-produced technology, and this is also the starting point for optical display of OSG open source smart glasses.
Grating diffraction, this is Lumus's technology, which achieves a thinner and smaller display by splitting the image multiple times. However, manufacturing precision is high. There is no mass production so far.
Light field technology, light field technology is simple and popular, is to calculate images of different depth of field. Through the analysis of the focal length of the human eye, the virtual image that the user sees through projection is visually consistent with the real image. Simply put, it is an imaging method similar to insect compound eyes. Currently only nvidia's research project pinlights display has been demonstrated.
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