How do the three well-known VR heads are positioned?

As the most popular display technology in the near future, VR virtual reality is sought after by manufacturers and users. Its development prospects and application scope are immeasurable. In VR first year - 2016, the three major VR vendors launched their own desktop virtual reality platforms. Oculus Rift, HTC Vive and Sony PlayStaTIon VR. These three products are of the highest standard in terms of hardware performance, platform size and resources. Recently, people often talked with me about the positioning technology of these three products, so I wanted to use this article to summarize and compare the positioning technologies of the three major products.

VR indoor positioning technology can locate the real-time position of VR devices such as VR head display and controller in space. VR devices with spatial positioning can not only provide better immersion, but also produce a sense of vertigo, and the whole picture can be like reality. The world is really moving according to our movement. Therefore, indoor positioning technology is very important for VR desktop virtual reality devices.

The Lighthouse technology used by HTC vive belongs to laser positioning technology. The positioning technology used by Oculus Rift and Sony PlayStaTIon VR belongs to optical positioning technology. Oculus Rift is infrared active optical technology, and Sony PlayStaTIon VR is visible active optical technology.

| HTC Vive's Lighthouse Indoor Positioning Technology

HTC Vive's laser positioning technology has been described in detail in the previous article, here we briefly review.

HTC's Lighthouse indoor positioning technology is a laser scanning positioning technology that uses lasers and light sensors to determine the position of moving objects. Two laser emitters are placed at opposite corners to form a rectangular area of ​​adjustable size. The laser beam is emitted by two rows of fixed LED lights inside the transmitter, 6 times per second. Each laser emitter has two scanning modules, which respectively rotate the horizontal and vertical directions to emit a laser scanning positioning space to the positioning space.

There are more than 70 photosensors on the HTC Vive head display and handle. The exact position of the sensor position relative to the laser emitter is calculated by calculating the time at which the laser is received, and the position and orientation of the head can be detected by a plurality of photosensors. It should be noted here that the laser positioning technology adopted by HTC Vive, the ID of the photosensitive sensor will be transmitted to the computing unit at the same time as the data received by the HTC Vive, that is, the computing unit can directly distinguish different photosensitive sensors, thereby A three-dimensional model of the head display and the handle is finally constructed based on the position of each photosensitive sensor fixed on the head display and the handle and other information.

Laser positioning technology has the advantages of low cost, high positioning accuracy, and distributed processing. It has almost no delay and is not afraid of occlusion. It can still be captured even if the handle is placed on the back or under the armpit. It can be said that the laser positioning technology avoids the disadvantages of high image processing technology, high equipment cost, slow operation speed, and is more susceptible to natural light, and achieves high-precision, high-reaction speed indoor positioning. In addition, compared to the other two products, HTC Vive allows users to move in a certain space, the user is limited, and can adapt to the game that needs to move. However, because HTC Vive's laser transmitting base station uses mechanical control to control the laser scanning positioning space, the mechanical control itself has the problem of poor stability and durability, because the stability and durability of the HTC Vive are slightly worse.

At present, the domestic Step-VR of G-Wearables adopts laser positioning, and has improved in positioning accuracy, delay or anti-interference.

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