interlace

A common way to compress video. Each frame of an interlaced video signal shows every other horizontal line of the image. As the frames are projected onto the screen, the video signal alternates between showing even and odd lines. When it is done really fast, around “60” frames per second, the video image looks smooth to the human eye!

As soon as they figured out how to interlace the after school film, it came into crystal clear focus!