International Stereoscopic Union















 

A Glossary of Stereoscopic Terms

image-splitter

A device mounted on the front of a single lens which, through the use of mirrors or prisms, divides the image captured on film into two halves, which are the two images of a stereoscopic pair. Sometimes called a frame-splitter, and often imprecisely called a beamsplitter.

infinity, stereo

See stereo infinity.

inter-lens separation (ILS)

The distance between the optical centres of the two lenses of a stereo camera or stereoscope, or (in wide-base stereography) between two photographic or viewing positions. Similar to base, stereo.

interocular distance

The separation between the optical centres of a twin-lens stereo viewer (which may be adjustable). Not necessarily the same as the interpupillary distance of the eyes.

interpupillary distance (IPD)

The distance between the centres of the pupils of the eyes when vision is at infinity. IPDs can range from 55 to 75 millimetres in adults, but the average is usually taken to be around 65 mm, the distance used for most resolving calculations and viewer designs.

inversion

The visual effect achieved when the planes of depth in a stereograph are seen in reverse order; eg, when the left-hand image is seen by the right eye, and vice-versa. Often referred to as pseudostereo.

 


   

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