Sunday 7 October 2012

Images Of 3d Wallpapers

Source(google.com.pk)
Images Of 3d Wallpapers Biography
Stereoscopy (also called stereoscopics or 3D imaging) is a technique for creating or enhancing the illusion of depth in an image by means of stereopsis for binocular vision. The word stereoscopy derives from the Greek "στερεός" (stereos), "firm, solid"[2] + "σκοπέω" (skopeō), "to look", "to see".[3]
Most stereoscopic methods present two offset images separately to the left and right eye of the viewer. These two-dimensional images are then combined in the brain to give the perception of 3D depth. This technique is to distinguish from 3D displays that displaying an image in three full dimensions which gives the observer the possibility to increase information about the 3-dimensional objects being displayed by head and eyes movements.
Contents  [hide]
1 Background
1.1 Visual requirements
2 Side-by-side
2.1 Freeviewing
2.2 Autostereogram
2.3 Stereoscope and stereographic cards
2.4 Transparency viewers
2.5 Head-mounted displays
2.6 Virtual retinal displays
3 3D viewers
3.1 Active
3.1.1 Shutter systems
3.2 Passive
3.2.1 Polarization systems
3.2.2 Interference filter systems
3.2.3 Color anaglyph systems
3.2.4 Chromadepth system
3.2.5 Pulfrich method
3.2.6 Over/under format
4 Other display methods without viewers
4.1 Autostereoscopy
4.1.1 Holography
4.1.2 Volumetric displays
4.1.3 Integral imaging
4.2 Wiggle stereography
5 Stereo photography techniques
6 Base line selection
6.1 Longer base line for distant objects "Hyper Stereo"
6.1.1 Limitations of hyperstereo
6.1.2 A practical example
6.2 Shorter baseline for ultra closeups "Macro stereo"
6.3 Baseline tailored to viewing method
6.4 Variable Base for "Geometric Stereo"
6.4.1 Precise stereoscopic baseline calculation methods
6.4.2 Multi-rig stereoscopic cameras
7 Stereo Window
8 References
9 External links
[edit]Background
Stereoscopy creates the illusion of three-dimensional depth from images on a two-dimensional plane. Human vision uses several cues to determine relative depths in a perceived scene.[4] Some of these cues are:
Stereopsis
Accommodation of the eye
Occlusion of one object by another
Subtended visual angle of an object of known size
Linear perspective (convergence of parallel edges)
Vertical position (objects higher in the scene generally tend to be perceived as further away)
Haze, desaturation, and a shift to bluishness
Change in size of textured pattern detail
All the above cues, with the exception of the first two, are present in traditional two-dimensional images such as paintings, photographs, and television. Stereoscopy is the enhancement of the illusion of depth in a photograph, movie, or other two-dimensional image by presenting a slightly different image to each eye, and thereby adding the first of these cues (stereopsis) as well. Both of the 2D offset images are then combined in the brain to give the perception of 3D depth. It is important to note that since all points in the image focus at the same plane regardless of their depth in the original scene, the second cue, focus, is still not duplicated and therefore the illusion of depth is incomplete. There are also primarily two effects of stereoscopy that are unnatural for the human vision: first, the mismatch between convergence and accommodation, caused by the difference between an object's perceived position in front of or behind the display or screen and the real origin of that light and second, possible crosstalk between the eyes, caused by imperfect image separation by some methods.
Although the term "3D" is ubiquitously used, it is also important to note that the presentation of dual 2D images is distinctly different from displaying an image in three full dimensions. The most notable difference is that, in the case of "3D" displays, the observer's head and eye movement will not increase information about the 3-dimensional objects being displayed. Holographic displays or volumetric display are examples of displays that do not have this limitation. Similar to how in sound reproduction it is not possible to recreate a full 3-dimensional sound field merely with two stereophonic speakers, it is likewise an overstatement of capability to refer to dual 2D images as being "3D". The accurate term "stereoscopic" is more cumbersome than the common misnomer "3D", which has been entrenched after many decades of unquestioned misuse. It is to note that although most stereoscopic displays do not qualify as real 3D display, all real 3D display are also stereoscopic displays because they meet the lower criteria as well.
Most 3D displays use this stereoscopic method to convey images. It was first invented by Sir Charles Wheatstone in 1838.[5][6]
Wheatstone mirror stereoscope
Wheatstone originally used his stereoscope (a rather bulky device)[7] with drawings because photography was not yet available, yet his original paper seems to foresee the development of a realistic imaging method:
Images Of 3d Wallpapers
Images Of 3d Wallpapers
Images Of 3d Wallpapers
Images Of 3d Wallpapers
Images Of 3d Wallpapers
Images Of 3d Wallpapers
Images Of 3d Wallpapers
Images Of 3d Wallpapers
Images Of 3d Wallpapers
Images Of 3d Wallpapers
Images Of 3d Wallpapers
Images Of 3d Wallpapers
Images Of 3d Wallpapers

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