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Savoy format
The Savoy format is a stereo format that is produced by prisms or other forms of image-splitters on a planar camera. (over-and-under for cine images and side-by-side for still images.

SBS
Side by side 3D format.

Screen space
This is the area appearing to be in a screen or behind the screens surface. Images that have a positive parallax will appear to be out in the screen space. The boundary between theater space and screen is known as the plane of the screen, and this area has zero parallax.

Selection device
A selection device is the hardware that is used to present the correct image to the appropriate eye, and to block out the unwanted image. When watching a 3D movie the selection device is normally some form of eye wear which is used in conjunction with a device at the projector (for example a polarizing device).

Separation (interaxial)
This is the distance between two taking positions within a stereo photograph. The term is occasionally used to denote the space between two homologues

Septum
The term septum refers to the partition that is used in a stereo camera to separate the two image paths. The term can be applied to any partition or design element that can effectively separate the lines of sight so that only the left and right images are seen by the corresponding eye.

Sequential stereograph
This is a stereo pair of images that are created using one camera that is moved by an appropriate space between the making of the left hand and right hand exposures.

Shutter glasses
Shutter glasses are a form of viewing device which should be worn on your head. They are generally double lensed and are covered in a liquid crystal material and controlled by your computer. When you are viewing a 3D image using these spectacles your computer will display the left image first. The computer will instruct your glasses to open the left eye’s “shutter”, which then makes the liquid crystal transparent, and then the computer will close the right eye’s “shutter” which then makes the liquid crystal opaque. Then within a short interval of 1/30 or 1/60 of a second, the right image is displayed, and then the glasses are simply instructed to reverse the shutters. This process will keep on going for as long as you are viewing the image. As the time interval is so short, your brain isn’t able to tell the difference in time, and so it views them simultaneously.

Siamese
This term is used as a verb, and it means to assemble a stereo camera from any relevant parts of two similar planar cameras.

Silvered screen
A silvered screen is a type of screen surface that is used for passive stereoscopic frontal projection. These silvered screens maintain the polarization of the light rays introduced to it through polarizing filters in front of the two projector lenses.
Single image random dot stereogram
This was popularized thanks to the “Magic Eye” type books of the 1990s. It refers to a computer generated stereogram within which the depth information is merged into a single image.  It is a form of random dot stereogram in which the stereo pair is encoded into one single composite image that each eye must to interpret separately. In 1979 the first ever single image random dot stereogram was programmed on an Apple II computer by Christopher Tyler and Maureen Clarke.

Slide bar
A slide bar is a device that is used for taking sequential stereo pairs of non-moving subjects, which enables a planar camera to move by an adequate separation whilst keeping the camera in a correct horizontal register with the optical axes that are either parallel or “toed-in” to make a convenient stereo window.

Spinography
Spinography is done by moving around a subject and taking pictures at an interval of every 10-20degrees. Or simply by placing the camera on a tripod and the subject on a turntable and rotating it the same amount of degrees between capturing the shot. This can also be done using 3D modeling software; however this does not create the same sense of depth as stereographics. In order to view spinography on a computer you will normally need to download a small program for your browser, which is known as a ‘plug in’.

Squeeze
Is the opposite effect to ‘stretch’. Squeeze is an effect which happens when a stereogram is viewed from a distance closer than the optimum, particularly in projection.  It is the diminution of depth within a stereogram in relation to its other two dimensions.

Stereo blind
Stereo blind is a term which is commonly used to describe people that cannot fuse two images into one with depth.

Stereo infinity
This is the furthest distance at which spatial depth effects are usually discernible. They are usually regarded at 200 meters for practical purposes.

Stereo pair
Charles Wheatstone in 1838 created the first ever stereoscopic viewer for the 3D viewing of stereopairs.

Stereo vision
Stereoscopic vision Stereopsis
A two eye view will merge in the brain which then creates the visual appearance of one 3D image. This is a byproduct of good binocular vision skills.

Stereo window
This is the viewing frame or border of a stereo pair, that defines a spatial plane through which 3D image can be viewed beyond. It is a design feature in some stereo cameras, where the lenses axes are slightly offset (inwards) from the axes of the film apertures. It creates a self-determining window in the resulting images, which is normally set at around a 2 meters distance away from the audience. If any of the objects appear to be nearer to the viewer than the plane then it is known as ‘breaking the window’.

Stereocomparator
This is a stereoscopic instrument which is used for measuring parallax. It usually includes the task of measuring photograph coordinates of the images points.

Stereogram
Stereogram is the general term for any arrangement of left and right hand views which produce a 3D outcome. The result may consist of one of the following things. (1) A over and under or side-by-side pair of images (2) Superimposed images which are projected onto a screen (3) In video, alternate projected left and right images which fuse through the persistence of vision. (4) A vectograph (5) Lenticular images (6) A color-coded composite (anaglyph)

Stereograph
This term created by Wheatstone refers to a three dimensional image which is produced by drawing. It now denotes any image that is viewed from a stereogram.

Stereographer
Is the term used for a person who makes stereo pictures.

Stereographoscope
This is an early style of stereoscope that carries a large monocular lens which is situated above the two regular stereoscopic lenses, and it is used for the viewing of planar photographs.

Stereographs
Stereograms
Stereopairs

These are two images which are made from different points of view that are placed side by side. When they are viewed with the correct equipment the effect is remarkably life like.

Stereography
Stereography is the practice and art of 3D image making.

Stereojet prints
Stereojet prints are made from a special transparency material which has polarized images ink jetted onto either side. They can be shown as transparencies or mounted against a reflective surface and scaled up to poster size. They can be viewed with a cheap pair of polarized lenses which are made specifically for stereo viewing. Regular polarized sunglasses tend not to work as their lenses are mounted at the wrong polarization angle. The colors are truer than those in anaglyphs and when they are properly lit the outcome looks extremely real.

Stereo-photogrammetry
This is based upon the idea of stereo viewing which comes from the fact that humans naturally view their surroundings in three dimensions. Each eye can see a single scene from slightly different position. Our brain the works out the difference between them and reports/shows it in the third dimension.

Stereoplexing
Stereoplexing which is also known as stereoscopic multiplexing is a way to incorporate information for the left and right eyes perspective views into one single information channels without an expansion of the bandwidth.

Stereoplotter
This instrument is used for plotting a map or obtaining spatial solutions through observing pairs of stereo photographs.

Stereopsis
Is the mixing (blending) of stereopairs by the human brain. It is the mental process of converting left and right eye images seen into the awareness of depth in a single 3D concept.

Stereopticon
Stereopicon is a term which is used when describing a stereoscope.  The term was first used in 1875 when identifying a twin image magic lantern which could be used to get information on depth by the blended sequenced presentation of a collection of planar views of a subject. It was later erroneously applied to other kinds of non-stereo projectors.

Stereo-restitution
This is a process that uses 2D information which is held in a pair of images to recreate an objects position and shape.

Stereoscope
A stereoscope is a binocular optical instrument which helps a viewer obtain a mental impression of a 3D model when viewing stereograms. The stereoscope device uses and designs of other stereoscopic instruments include a combination of lenses, prisms and mirrors. It is normally an optical device which has a twin viewing system.

Stereoscopic
Sterescopic images are ‘solid looking’ images. They have visible depth as well as showing height and width. The can refer to any device or experience that is associated with binocular depth perception.

Stereoscopic 3D
3D Stereoscopic is two images which were captured from slightly different angles, which makes them appear three dimensional when
they are viewed together.

Stereoscopic Real Estate
Quite simply is the 3D space available for you to use to set your scene. It shows the comfort zone which is pyramid-shaped that starts the middle of the theater and extend a few dozen feet behind the screen.

Stereoscopy
Stereoscopy is the science and art of making images with the depth sense stereopsis. Stereography is the reproduction of the effect of binocular vision due to the other graphic or photographic means.

Stretch
The term stretch refers to the elongation of depth within a stereogram in relation to its other two dimensions. It is usually caused when the stereogram is viewed from more than the optimum distance, especially when in projection. Stretch is the direct opposite to the effect defined as ‘squeeze’,

Strip of stereo photographs
This is a collection/series of overlapping photographs which were taken at regular intervals to create a sequence of stereo images whilst the camera was being moved in one direction.

Surround
The surround is simply the horizontal and vertical edges that are directly adjacent to the screen.

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