Visual effects introduced into an image during scanning that aren't in the original material. May include such things as dots, pixellation, straight or wavy lines, patterns, etc. See also: Pixel Last Reviewed: 2003-03-01
(or "artifacting"): Imperfections in an interlaced image when an object begins to move and, during a split- second, you can still see it (or parts of it) in its previous position. Particularly noticeable with horizontal lines, such as a door frame, as the camera pans horizontally.
Are false information that can be present in an image. They can appear as spots, patterns, lines, jagged edges or any other localized imprefection. These can be caused by signal processing, electrical noise or optical imperfections.