How can different standards be displayed on the same display?
Upscaling, deinterlacing and motion compensation can be used to convert from one standard to another. Upscaling is used to increase the number of lines, e.g. from 576i to 1080i. This can be done crudely by interpolating or it can be done better using image processing techniques. Some DVD players and HDTV sets can do this but don’t expect great results. It currently requires very expensive hardware to do this well. Some of the content broadcast on HD channels is actually standard definition pictures upscaled. The broadcaster will do this with much better technology than you can find in a home DVD player or HDTV but no upscaling technology can create detail that is not in the original. Sky have said that their HD channels will include some upscaled content, but they will label clearly so that we know when it is true HD. Deinterlacing is used to convert from interlaced standards such as 1080i to progressive standards such as 720p. This is more difficult to do well than upscaling. Some TV
