Raster Scan

A raster scan, or raster scanning, is the rectangular pattern of image capture and reconstruction in television. By analogy, the term is used for raster graphics, the pattern of image storage and transmission used in most computer bitmap image systems. The word raster comes from the Latin word rastrum (a rake), which is derived from radere (to scrape); see also rastrum, an instrument for drawing musical staff lines. The pattern left by the tines of a rake, when drawn straight, resembles the parallel lines of a raster: this line-by-line scanning is what creates a raster. It's a systematic process of covering the area progressively, one line at a time. Although often a great deal faster, it's similar in the most-general sense to how one's gaze travels when one reads lines of text.

Read more about Raster Scan:  Video Timing, Perception, Theory and History, History

Other articles related to "raster scan, raster":

Raster Scan - History
... The use of raster scanning in television was proposed in 1880 by French engineer Maurice Leblanc ... The concept of raster scanning was inherent in the original mechanical disc-scanning television patent of Paul Nipkow in 1884 ... The term raster was used for a halftone printing screen pattern as early as 1894 ...