In order to realize the immersive characteristics of a virtual display, it is necessary to have the sensory characteristics of the human body, including vision, hearing, touch, taste, smell, and so on. This section focuses on visual display systems.
VR is actually an acronym for VirtualReality, which translates into Chinese as virtual reality. As the name suggests, it is to create a realistic virtual reality effect through technical means. The history of the development of virtual reality technology is actually not short, but really will play out this technology and let people experience a very realistic reality effect.
(1) virtual reality helmet
Virtual reality helmet is the use of human left and right eyes to obtain information differences, guide the user to produce a sense of being in a virtual environment of a helmet stereo display. The display principle is that the left and right eye screens display images of the left and right eyes, the human eye to obtain this information with differences in the mind to produce a sense of three-dimensional. Virtual reality helmet helmet as a virtual reality display device, with small and closed strong characteristics, in military training, virtual driving, virtual city and other projects have a wide range of applications.
(2) Binocular Omni-directional Display
Binocular Omni-directional Display (BOOM) is a kind of stereoscopic display device coupled to the head, which is a special kind of head display device. The use of BOOM is more similar to the use of a telescope, it bar two independent CRT monitors bundled together by two mutually perpendicular mechanical arm title, which not only allows the user to freely manipulate the position of the display by hand in a radius of 2m of the sphere of the space, but also the weight of the display to be able to drop a clever balance but refers to the always maintain the level of the platform movement is not affected. There are position trackers at each node on the support arm, so BOOM has the same real-time observation and interaction capabilities as an HMD.
(3) CRT Terminal-LCD Light Gate Glasses
The working principle of CRT Terminal-LCD Light Gate Glasses stereoscopic vision system is that there is a computer that generates two images of the left and right eyes respectively, and after synthesizing and processing them, they are displayed on the CRT terminal in time-sharing and alternating ways. The user wears a pair of liquid crystal light gate glasses connected to the computer, the glasses lens in the driving signal, will be synchronized with the image display rate alternately open and close, that is, when the computer displays the image of the left eye, there is an eye lens will be shielded, the display of the image of the right eye, the left eye lens is shielded. According to the relationship between binocular inspection and depth distance is proportional, the human visual physiological system can automatically synthesize these two inspection images into a stereo image.
(4) large screen projection - LCD light gate glasses
Large screen projection - LCD light gate glasses stereoscopic vision system principle and CRT display the same only time-sharing image CRT display to a large screen display, for the projection of CRT or digital projector requires very high brightness and resolution, it is suitable for a larger use within the application needs to produce a projected image.
Cave VR system is a projection-based surround screen cave automated virtual environment CAVE (Cave Automatic Virtual Environment). People are in a computer-generated world, and can walk back and forth in it, from different angles to observe him, touch it, change his shape. Large screen projection system out of CAVE and cylindrical projection screen and rectangular splicing of the projection screen.
(5) CAVE cavernous virtual reality display system
CAVE projection system is composed of more than 3 faces (including 3 faces) rigid back projection wall composed of a high degree of immersion in the virtual demonstration environment, with the three-dimensional tracker, the user can be surrounded by the projection wall of the system of close contact with the virtual three-dimensional objects, or feel free to roam the "real" virtual environment. "CAVE systems are generally used in high-standard virtual reality systems. To New York University in 94 years since the establishment of the first CAVE system, CAVE has been in the world's more than 600 colleges and universities, national science and technology centers, various research institutions for a wide range of applications.
The VR-PLATFORM CAVE system is a room-based projection visual collaborative environment based on multi-channel view synchronization technology and stereoscopic display technology, which provides a room-sized minimum of three or maximum of seventy (2004) cubic projection display space for multiple participants, all of whom are fully immersed in an advanced virtual reality environment surrounded by stereoscopic projection images. All participants are fully immersed in an advanced virtual simulation environment surrounded by three-dimensional projection images, with the help of the corresponding virtual reality interaction equipment (such as data gloves, position trackers, etc.), so as to obtain an immersive high-resolution three-dimensional audio-visual images and 6 degrees of freedom interaction. Because the projection surface can cover all of the user's field of view, the VR-PLATFORM CAVE system can provide the user with an unprecedented immersive experience with a shocking immersive feeling.
(6) Smart Glasses
Smart glasses are a very creative product that can directly free your hands, so that you do not need to hold the device with your hands all the time, and you do not need to use your hands to continuously click on the screen input. Smart glasses with a natural interactive interface, equivalent to the image interface of the current handheld terminal, do not need to click, but only need to use the human instinctive behavior, such as: shaking head, speech, eye roll, etc., you can interact with the smart glasses. As a result, this approach improves the user experience and operates more naturally and casually.
Sound Devices
(1) Three-dimensional Stereo Sound
Three-dimensional sound is not the concept of stereo sound, but rather a synthetic sound that is computer-generated and capable of artificially setting the three-dimensional position of the sound source in space. This sound technology not only takes into account the human head, torso on the sound reflection of the impact, but also on the human head for real-time tracking, is the virtual sound can be with the human head movement accordingly, so as to be able to get a realistic three-dimensional auditory effect.
(2) Speech Recognition
VR's speech recognition system allows computers to have human auditory function, is human-machine to language, the most natural way for humans to exchange information. According to the human mechanism and hearing mechanism, the computer must be equipped with "vocal organs" and "auditory nerve". When a participant speaks into a microphone, the computer converts what is said into a stream of commands, just as if it were typing a command from a keyboard, and the most powerful and difficult aspect of a VR system is speech recognition.
Speech recognition devices in VR systems are mainly used to merge the sensory tracts (auditory tracts, visual tracts) of other participants. Speech recognition systems can be processed and adjusted when a large amount of data is input, like humans will temporarily shut down the auditory tracts when they have a heavy workload. In this case, however, the normal use of speech recognition technology will be affected.