Interlace is a technique of improving the picture quality of a video transmission without consuming any extra bandwidth. It was invented by RCA engineer Randall C. Ballard in the 1930s [1] [2]. It was ubiquitous in television until the 1970s, when the needs of computer monitors resulted in the reintroduction of progressive scan. While interlace can improve the resolution of still images, it can cause flicker and various kinds of distortion. Interlace is still used for most standard definition TVs, and the 1080i HDTV broadcast standard, but not for LCD, micromirror (DLP), or plasma displays, which are inherently progressive scan. These devices require some form of deinterlacing which can add to the cost of the set. Nevertheless as of 2006, progressive displays now dominate the HDTV market.