Upconversion

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Upconversion is the conversion of video with a lower picture resolution to one with a higher definition. Typically, it refers to taking programming in standard definition (480i) and making it into high definition (720p, 1080i, or 1080p). This is done though interpolation, which gives a false precision as to what the extra pixels should be. Many DVD recorders use upconversion as a substitute for actual HD recording and playback, as there is no widely-accepted standard for recording HD content to a regular DVD (or even HD DVD and Blu-ray), likely due to fears of legal attacks by copyright holders.