deinterlace

To convert an interlaced image to a progressive scan image. Also called "line doubling" and "I to P conversion," deinterlacing is built into modern DVD players and TVs. Most DVD content is interlaced, and deinterlacing fills in the missing lines so that 60 full frames per second are displayed. See interlace.

Easy - Film to Interlaced Video to Progressive
When a movie film is converted to video, all the original content is available in the video. Each full film frame of the movie is turned into two video half frames (see 3:2 pulldown for details), and the two video half frames can be readily converted back into one full frame for progressive scan. In order to do this, the deinterlacing technique analyzes the interlaced sequence to determine if it was originally film.

Difficult - Interlaced Video to Progressive
Content that was originally created in the interlaced video format is difficult to deinterlace, and this is where one technique from one company can be superior to that of another.

In interlaced video, each half frame is actually captured at a different moment in time as the camera is shooting. As a result, the pixels in every other line are simply not there. Using various algorithms, deinterlacing methods analyze the pixels in the lines above and below the missing lines and conjure up new pixels for the missing lines. See interlace, DCDi and 3:2 pulldown.

DCDi Eliminates the Jaggies

Faroudja's DCDi technology is known for producing fewer jaggies in diagonal transitions than other methods by analyzing the changes in motion in both video fields (see DCDi). (Image courtesy of Home Theater and High Fidelity, www.hometheaterhifi.com)