Is the process of leveling, scaling and orientating the control points of a proportionately oriented stereoscopic model
Accidental stereo effects
These effects are found when supposedly identical parallel pictures are fused together. (A great example of this can be seen on postage stamps, where the irregularities in printing cause a limited 3D effect.)
This refers to the eyes refocusing on another object as the viewers vision shifts from one distance plane to another.
Accommodation -vergence relationship
This learned relationship which was established through early experiences between the verging and focusing of the eyes when looking at one particular subject in the visual world. This is normally called the convergence/accommodation relationship or the accommodation convergence relationship.
Is caused when the eyes change focus whilst the they converge. The accommodation-convergence link is something that needs to be overcome in stereo viewing as the focus remains unchanged on the plane of the constituent flat images.
Refers to the human eyes ability to automatically and repeatedly change focus from one distance to another. Accommodative facility is usually measured by use of ‘flipper lenses’. The measurement of each eye is usually made and then followed by comparing the performance of one eye against both eyes working together.
Is a unique method of stereoscopic display which permits each eye to see the left-eye/right-eye images in an extremely rapid succession by using powered shutter glasses which function alternatively. This is done to in a very quick succession of flashes to create the impression of depth.
The distance between the left and right camera positions from which the stereo images are taken.
Along track stereo pair
Refers to a pair of images that are acquired from different viewing angles as the plane moves along its flight path.
Amblyopia is a visual defect that affects around 3 out of every 100 children in the U.S.A. Amblyopia, also known as ‘Lazy Eye’, involves lowered visual clarity and/or weakened muscle control in just one eye. The result of suffering from Lazy Eye is often a loss of binocular depth perception and stereoscopic vision.
Is a type of stereogram that can be printed, projected if televised. With Anaglyph technology the two images are superimposed but then are separated, so that each eye will see only the desired image. The use of differently colored filters and 3D glasses (usually red and cyan, or red and green) make the effect work. Without the correct glasses and using just the naked eye the effect will not work and the image will look doubled and blurry. Traditionally, the left eye image is printed in red and the right eyes image in green ink.
An analogue stereoplotter will implement all corrections and orientations with optical and mechanical means.
An analytical stereoplotter is a stereo comparator which is encoded so that coordinate measurements on images can be moved to a computer and converted into a digital format. By using hardcopies, features and contours are digitized and then plotted out from the computer.
These devices (Analyzers) are placed in front of the eyes with intention of separating the left and right eyes images. Usually used when the image is being projected, these typically are polarizing glasses, liquid crystal shutters or anaglyph spectacles.
Refers to the distance between the centers or of the openings in the cameras aperture. The distance is usually 71.25 mm in many stereo cameras using a 5-perforation format. However, cameras in a 7-perforation format typically use an aperture separation of 63.5 mm.
Application Programming Interface (API)
An API is a standard programming interface that allows developers to write their applications to a specific standard without having any major knowledge about the hardware’s implementations. A benefit is that a single application can comfortably run on a variety of hardware platforms without the need for it to be rewritten for each of those specific platforms. By intercepting the API’s instructions, the software driver for the hardware translates its instructions into specific instructions which are created for the hardware. Open GL and DirectX APIs can also emulate hardware functions to ensure that an application will work even if the hardware platform is missing a feature.
Astigmatism is a distortion in the vision which is caused due to an irregular shape of the eye or its components.
This normally describes a stereogram that is designed to be viewed by people without the use of any special equipment in front of the eyes. (For example: a single-image random-dot stereogram.)
Is a term used when referring to glasses free 3D.