This is accomplished by dissolving lignin in a cooking liquor, so that it may be washed from the cellulose ; this preserves the length of the cellulose fibres. Paper made from chemical pulps are also known as wood-free papers —not to be confused with tree-free paper ; this is because they do not contain lignin, which deteriorates over time. The microscopic structure of paper: Micrograph of paper autofluorescing under ultraviolet illumination.
Pulfrich effect The Pulfrich effect is based on the phenomenon of the human eye processing images more slowly when there is less light, as when looking through a dark lens. Because the Pulfrich effect depends on motion in a particular direction to instigate the illusion of depth, it is not useful as a general stereoscopic technique.
For example, it cannot be used to show a stationary object apparently extending into Intermediate paper out of the screen; similarly, objects moving vertically will not be seen as moving in depth.
Incidental movement of objects will create Intermediate paper artifacts, and these incidental effects will be seen as artificial depth not related to actual depth in the scene. The most common one with mirrors is the View Magic. Another with prismatic glasses is the KMQ viewer. Autostereoscopic display technologies use optical components in the display, rather than worn by the user, to enable each eye to see a different image.
Because headgear is not required, it is also called "glasses-free 3D". The optics split the images directionally into the viewer's eyes, so the display viewing geometry requires limited head positions that will achieve the stereoscopic effect.
Automultiscopic displays provide multiple views of the same scene, rather than just two. Each view is visible from a different range of positions in front of the display.
This allows the viewer to move left-right in front of the display and see the correct view from any position.
The technology includes two broad classes of displays: Examples of autostereoscopic displays technology include lenticular lensparallax barriervolumetric displayholography and light field displays. Holography and Computer-generated holography Laser holography, in its original "pure" form of the photographic transmission hologram, is the only technology yet created which can reproduce an object or scene with such complete realism that the reproduction is visually indistinguishable from the original, given the original lighting conditions.
The eye differentially focuses objects at different distances and subject detail is preserved down to the microscopic level. The effect is exactly like looking through a window. Unfortunately, this "pure" form requires the subject to be laser-lit and completely motionless—to within a minor fraction of the wavelength of light—during the photographic exposure, and laser light must be used to properly view the results.
Most people have never seen a laser-lit transmission hologram. The types of holograms commonly encountered have seriously compromised image quality so that ordinary white light can be used for viewing, and non-holographic intermediate imaging processes are almost always resorted to, as an alternative to using powerful and hazardous pulsed lasers, when living subjects are photographed.
Although the original photographic processes have proven impractical for general use, the combination of computer-generated holograms CGH and optoelectronic holographic displays, both under development for many years, has the potential to transform the half-century-old pipe dream of holographic 3D television into a reality; so far, however, the large amount of calculation required to generate just one detailed hologram, and the huge bandwidth required to transmit a stream of them, have confined this technology to the research laboratory.
Ina Silicon Valley company, LEIA Incstarted manufacturing holographic displays well suited for mobile devices watches, smartphones or tablets using a multi-directional backlight and allowing a wide full- parallax angle view to see 3D content without the need of glasses.
Volumetric display and Bubblegram Volumetric displays use some physical mechanism to display points of light within a volume. Such displays use voxels instead of pixels. Volumetric displays include multiplanar displays, which have multiple display planes stacked up, and rotating panel displays, where a rotating panel sweeps out a volume.
Other technologies have been developed to project light dots in the air above a device.Latest Updates. Advertisement for the sale of Raddi (Waste Paper) 22/11/ - PM Notification: Board Employees Association Election Session 20/11/ - PM; Press Release for head of private institutes, regarding attestation of private admission forms 20/11/ - AM; Issuance of Matric Supply Result Cards 20/11/ - AM.
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