Wiktionary
n. A device that allows its operator to draw a freehand sketch over a motion picture image
Wikipedia
A telestrator is a device that allows its operator to draw a freehand sketch over a moving or still video image. Also known as a video marker, this device is often used in sports and weather broadcasts to diagram and analyze sports plays or incoming weather patterns. The user typically draws on a touchscreen with a finger or uses a pen on a graphics tablet. From the touchscreen or the tablet, the drawing signal is communicated to the telestrator, which overlays the video image with the drawing and outputs the combined signal for broadcast or display.
Today, the telestrator is used in a wide variety of applications (from educational, boardroom, church and military presentations to telemedicine conferences), where it can be used by both the near and far ends to annotate precise details of microscopic images or other medical images that are under consultation. The telestrator is also used in courtrooms to communicate details of multi-media images presented to a jury, as was most famously seen during the O.J. Simpson trial in March 1995.
Usage examples of "telestrator".
We rented a huge flat-wall SuperHiDef screen and spent a few hours learning to use the Telestrator system in our shipbuilding program so we could point and click with an electronic wand to expand, slice and dice, rotate, swoop and swirl, pan, zoom, and dolly in or out with ease as we explained the various features.
Hanging on the walls around the Telestrator screen were three-by-four-foot color prints of some old magazine covers and Walt Disney posters from the 1950s, for no better reason than that they looked good.