7. The Menus / 7.7 The Filter Menu
Video images are made of two half images. The first consists of all odd lines, the second of all even lines. If an object is moving fast, the two images differ a lot and the result is unsharp. The Deinterlace filter reduces this effect by eliminating one of the two images.
Start offers the choice to use the odd or the even lines for the result. Mode defines how to replace the lines. You can Double Lines, which doubles the lines, that are kept, or you can Interpolate Lines, the merges two following lines of a half picture.