Interlacing is a technique used by video recorders and television sets to ensure a smooth and fluid display on screen. It splits each frame into two sets of fields, an upper field and a lower field. Each field carries half the picture in horizontal rows, which when added together creates one interlaced frame. When viewing these frames in motion they are played too quickly for the eye to pick up any trace of interlacing, however, if you pause the video the effect becomes more prominent, growing even more if you happen to export a frame and view it on a computer screen.
