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Glossary of 3D terminology

Glossary of 3D terminology
There are many terms used in stereoscopic 3D imaging that are not required in 2D imaging, this page provides definitions.

Depth Budget
This is the maximum amount of 3D depth in-front and behind the physical display surface that it is recommended to use for a specific 3D display. If the depth budget is exceeded then viewers will find it increasingly uncomfortable to view a stereoscopic image, and for larger values they will see a double image.
The aim of defining a depth budget is to provide content creators a concept of the working volume they can use on each display.

The depth budget is defined in mm of perceived depth, measured from the display surface, and provides a precise target for the content creator to work within. The limits can be different in-front and behind the display.

The size of the depth budget is strongly dependent on viewing distance, the further you are from a display the higher the depth budget can be. This is because the human vision system responds to stereoscopic images differently at different viewing distances from the physical display surface.

In our work reported in [Jones et al 2001] we conclude that for desktop displays (i.e. short viewing distances) a comfortable depth budget is a range of /- 55mm either side of the display surface, and this is supported by other similar work surveyed in the same paper. There is little hard evidence available to give clear recommendations for displays viewed at longer viewing distances and stereographers rely on practical experience to judge these situations.

Depth Range
This is the range of depth seen by a physical or CG stereoscopic camera system, it is defined in mm from the camera to the nearest and furthest point in the cameras view.

Perhaps the most important problem in stereoscopic imaging is how to capture the depth range in the scene so that is displayed within the comfortable depth budget available on your target display. Our precise camera baseline calculation methods provide a reliable and repeatable way to ensure this happens, so that the creative composition of a scene can be controlled by the stereographer.

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