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Vergence-Accommodation Conflict
Vergence-accommodation conflict (VAC), also known as accommodation-vergence conflict, is a visual phenomenon that occurs when the brain receives mismatching cues between vergence and accommodation of the eye. This commonly occurs in virtual reality devices, augmented reality devices, 3D movies, and other types of stereoscopic displays and autostereoscopic displays. The effect can be unpleasant and cause eye strain. Two main ocular responses can be distinguished: vergence of eyes, and accommodation. Both of these mechanisms are crucial in stereoscopic vision. Vergence or independent inward/outward rotation of eyes is engaged to fixate on objects and perceive them as single. Incorrect vergence response can cause double vision. Accommodation is the eye’s focusing mechanism and it is engaged to produce a sharp image on a retina. Both of these mechanisms are neurally linked forming the accommodation-convergence reflex of eyes. One can distinguish vergence a distance of a point t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oculus Quest 2
Quest 2 is a standalone virtual reality headset developed by Reality Labs, a division of Meta Platforms. It was unveiled on September 16, 2020, and released on October 13, 2020 as the Oculus Quest 2. It was then rebranded as the Meta Quest 2 in 2022, as part of a company-wide phase-out of the Oculus brand following the rebranding of Facebook, Inc. as Meta. It is an evolution of the original Oculus Quest with a similar design, but with a lighter weight, updated internal specifications, a display with a higher refresh rate and per-eye resolution, and updated Oculus Touch controllers with improved battery life. As with its predecessor, the Quest 2 can run as either a standalone headset with an internal, Android-based operating system, or with Oculus Rift-compatible VR software running on a personal computer. The Quest 2 received mostly positive reviews as an incremental update to the Quest, but some of its changes faced criticism, including its stock head strap, reduced int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eye Tracking
Eye tracking is the process of measuring either the point of gaze (where one is looking) or the motion of an eye relative to the head. An eye tracker is a device for measuring eye positions and eye movement. Eye trackers are used in research on the visual system, in psychology, in psycholinguistics, marketing, as an input device for human-computer interaction, and in product design. In addition, eye trackers are increasingly being used for assistive and rehabilitative applications such as controlling wheelchairs, robotic arms, and prostheses. Recently, eye tracking has been examined as a tool for the early detection of autism spectrum disorder. There are several methods for measuring eye movement, with the most popular variant using video images to extract eye position. Other methods use search coils or are based on the electrooculogram. History In the 1800s, studies of eye movement were made using direct observations. For example, Louis Émile Javal observed in 187 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of 3D-enabled Mobile Phones
This is a list of 3D-enabled mobile phones, which typically use autostereoscopic displays. Some devices may use other kinds of display technology, like holographic displays or multiscopic displays. Some devices employ eye tracking in aiming the 3D effect to the viewer's eye. List of 3D-enabled mobile phones List of 3D Video Players See also * List of mobile phone games with 3D display support *Nintendo 3DS The is a foldable dual-screen handheld game console produced by Nintendo. Announced in March 2010 as the successor to the Nintendo DS, the console was released originally on February 26, 2011 and went through various revisions in its lifetime, ... * List of NFC-enabled mobile devices * Projector phone * LEIA Inc References External links 3D Video Collections For 3D DEVICESDivided by categories (version available for all Desktops, Smartphones, Tablets and above SmartTV 3D) Mobiles by categories Global 3D-Enabled Smartphones Industry {{Mobile phones Stereos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SeeReal Technologies
SeeReal Technologies GmbH is a Dresden-based company focusing on the development of 3D displays. It is owned by its Luxembourg parent company SeeReal Technologies S.A., which is responsible for marketing, partnering and IP licensing. The firm was founded in 2002 by Dr. Armin Schwerdtner, who had previously headed an optics research group at the Dresden University of Technology (TU Dresden). SeeReal develops technology that is licensed to display manufacturers, including several variants of a tracked autostereoscopic display. The firm has presented a real-time desktop holographic display on the SID 2007 Display Week in Long Beach (California) and thFPD2007 in Yokohama (Japan). The firm owns more than 100 patents in the field of holographic Holography is a technique that allows a wavefront to be recorded and later reconstructed. It is best known as a method of generating three-dimensional images, and has a wide range of other uses, including data storage, microscopy, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Integral Imaging
Integral imaging is a three-dimensional imaging technique that captures and reproduces a light field by using a two-dimensional array of microlenses (or lenslets), sometimes called a fly's-eye lens, normally without the aid of a larger overall Objective (optics), objective or viewing lens. In capture mode, in which a film or detector is coupled to the microlens array, each microlens allows an image of the subject as seen from the viewpoint of that lens's location to be acquired. In reproduction mode, in which an object or source array is coupled to the microlens array, each microlens allows each observing eye to see only the area of the associated micro-image containing the portion of the subject that would have been visible through that space from that eye's location. The optical geometry can perhaps be visualized more easily by substituting pinholes for the microlenses, as has actually been done for some demonstrations and special applications. A display using integral imaging is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nintendo 3DS
The is a foldable dual-screen handheld game console produced by Nintendo. Announced in March 2010 as the successor to the Nintendo DS, the console was released originally on February 26, 2011 and went through various revisions in its lifetime, produced until 2020. The system features backward compatibility with the Nintendo DS's library of video games. As an Eighth generation of video game consoles, eighth-generation console, its primary competitor was Sony Interactive Entertainment, Sony's PlayStation Vita. The most prominent feature of the 3DS is its ability to display Stereoscopy, stereoscopic 3D images without the use of 3D glasses or additional accessories. Other features of the 3DS include its StreetPass and SpotPass tag modes that were powered by Nintendo Network, #Augmented reality, augmented reality capabilities using its Stereo camera, 3D camera system, and Virtual Console, which provides a method for users to download and play video games originally released for olde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autostereoscopy
Autostereoscopy is any method of displaying stereoscopic images (adding binocular perception of 3D depth) without the use of special headgear, glasses, something that affects vision, or anything for eyes on the part of the viewer. Because headgear is not required, it is also called "glasses-free 3D" or "glassesless 3D". There are two broad approaches currently used to accommodate motion parallax and wider viewing angles: eye-tracking, and multiple views so that the display does not need to sense where the viewer's eyes are located. Examples of autostereoscopic displays technology include lenticular lens, parallax barrier, and integral imaging. Volumetric and holographic displays are also autostereoscopic, as they produce a different image to each eye, although some do make a distinction between those types of displays that create a vergence-accommodation conflict and those that do not. Autostereoscopic displays based on parallax barrier and lenticular methodologies have bee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autostereogram
An autostereogram is a two-dimensional (2D) image that can create the optical illusion of a three-dimensional (3D) scene. Autostereograms use only one image to accomplish the effect while normal stereograms require two. The 3D scene in an autostereogram is often unrecognizable until it is viewed properly, unlike typical stereograms. Viewing any kind of stereogram properly may cause the viewer to experience vergence-accommodation conflict. The optical illusion of an autostereogram is one of depth perception and involves stereopsis: depth perception arising from the different perspective each eye has of a three-dimensional scene, called binocular parallax. Individuals with disordered binocular vision and who cannot perceive depth may require a wiggle stereogram to achieve a similar effect. The simplest type of autostereogram consists of a horizontally repeating pattern, with small changes throughout, that looks like wallpaper. When viewed with proper vergence, the repeating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stereoscope
A stereoscope is a device for viewing a stereoscopy, stereoscopic pair of separate images, depicting left-eye and right-eye views of the same scene, as a single three-dimensional image. A typical stereoscope provides each eye with a lens that makes the image seen through it appear larger and more distant and usually also shifts its apparent horizontal position, so that for a person with normal binocular depth perception the edges of the two images seemingly fuse into one "stereo window". In current practice, the images are prepared so that the scene appears to be beyond this virtual window, through which objects are sometimes allowed to protrude, but this was not always the custom. A divider or other view-limiting feature is usually provided to prevent each eye from being distracted by also seeing the image intended for the other eye. Most people can, with practice and some effort, view stereoscopic image pairs in 3D without the aid of a stereoscope, but the physiological dept ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light Field Display
A light field, or lightfield, is a vector function that describes the amount of light flowing in every direction through every point in a space. The space of all possible '' light rays'' is given by the five-dimensional plenoptic function, and the magnitude of each ray is given by its radiance. Michael Faraday was the first to propose that light should be interpreted as a field, much like the magnetic fields on which he had been working. The term ''light field'' was coined by Andrey Gershun in a classic 1936 paper on the radiometric properties of light in three-dimensional space. The term "radiance field" may also be used to refer to similar, or identical concepts. The term is used in modern research such as neural radiance fields The plenoptic function For geometric optics—i.e., to incoherent light and to objects larger than the wavelength of light—the fundamental carrier of light is a ray. The measure for the amount of light traveling along a ray is radiance, denoted ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holographic Display
A holographic display is a type of 3D display that utilizes light diffraction to display a three-dimensional image to the viewer. Holographic displays are distinguished from other forms of 3D displays in that they do not require the viewer to wear any special glasses or use external equipment to be able to see the image, and do not cause a vergence-accommodation conflict. Some commercially available 3D displays are advertised as being holographic, but are actually multiscopic. Timeline 1947 – Hungarian scientist Dennis Gabor first came up with the concept of a hologram while trying to improve the resolution of electron microscopes. He derived the name for holography, with "holos" being the Greek word for "whole," and "gramma" which is the term for "message." 1960 – The world's first laser was developed by soviet scientists Nikolay Basov and Alexander Prokhorov, and American scientist Charles H. Townes. This was a major milestone for holography because laser technology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
