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Highlights from a 3D TV Glossary

Need a brush-up on 3D TV terms? Try the Glossary for Video & Perceptual Quality of Stereoscopic Video for reference. The technical glossary was released back in August by a project team that joined members of the 3D@Home’s Consortium’s Content Committee and the MPEG IF’s 3D Working Group. The project was led by Motorola’s own Dr. Sean McCarthy, and the resulting document is quite thorough in its coverage of 3D terminology. The glossary will reportedly be updated as needed in the future, and there are plans to add multimedia examples as well. You can check out the complete document online, or browse through a selection of my favorites below.

Glossary Terms:

Accommodation – The physiological process that alters the shape of the lens of the eye and thereby the optical power of the eye so as to form a clear image of an object at both near and far distances.

Accommodation-Convergence Rivalry – A discrepancy between accommodation and convergence depth cues in which one of the depth cue impacts perception to a greater extent than the other.

Asymmetric Coding – A method of compression in which either the left- or right-eye image has a lower resolution or is compressed to a greater degree than the other eye.

Atmospheric Perspective – A depth cue in which distant objects progressively lose contrast and saturation with distance, typically as a result of atmospheric light scatter.

Binocular Parallax – The phenomenon in which the position of an object appears to change when viewed by the left eye alone and then the right eye alone, or vice versa, when the head is stationary.

Convergence – The ability of both eyes to turn inwards together. This enables both eyes to be looking at the exact same point in space.

Mosaic Artifact – A compression artifact in which adjacent blocks in an image have mismatching color, brightness, or texture.

Percival’s Zone of Comfort – An optometric rule of thumb for the viewing of stereo stimuli; it is the approximate range of vergence and accommodation responses for which the viewer can fuse images without discomfort.

Screen Door Artifact – A grid of fixed pattern noise resulting from the space between pixels.

Stereoscopic Latency – The amount of time between the presentation of a stereoscopic stimulus and the perception of depth by a typical viewer.Sticky Motion

Tautomorphic Image – A stereoscopic image which presents the original scene to the viewer exactly as it would have been perceived in life; i.e., with the same apparent scale, positions of scenic elements, and a stereo magnification of x1 for all subject matter in the view.