a) A transition between two video signals that occurs in the shape of a selected pattern. b) Any pattern system effect that reveals a new video, and more specifically, one that does not have an enclosed boundary on the screen. c) Special effect in which two pictures from different video sources are displayed on one screen. Special effects generators provide numerous wipe patterns varying from simple horizontal and vertical wipes to multi-shaped, multi-colored arrangements. The Digital Video Mixer includes this effect.