Verb
upconvert (third-person singular simple present upconverts, present participle upconverting, simple past and past participle upconverted)
(transitive) To convert (an audio or video signal, etc.) from a lower quality or resolution to a higher one.
Along that HDR display, Sony also offers to “upconvert” SDR to HDR. Source: Internet
There’s an HD version of the pilot going around the Internet, which is obviously some kind of upconvert from an SD source, which looks truly terrible. Source: Internet