What Bitt posted is a crop of two interlaced fields of video (what makes up one frame for any interlaced format such as NTSC).

I understood the first post as one line, but the second description throws that out the window and I also started thinking about visible fields or single-field output onto a progressive display (which would be very odd - or very even, but not both ).

The Wii component cables are supposed to output 480p so you should never see any type of interlacing.