Sony DVP-NS999ES - Manual (Page 8)

ES Series DVD-Video/CD/SA-CD Players; Version 3.0 Page 8
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Moving pixels are created by composing adjacent pixels in the same
field. This minimizes motion blur.
Pixels for moving objects are created by composing pixels from scanning
lines immediately above and below within the same field. Because all
information comes from the same 1/60-second slice of time, this suppresses
motion artifacts. While this process does not result in the full improvement in
vertical resolution, the human eye is less sensitive to detail in moving objects.
Many conventional I/P conversion algorithms have these two modes: still
and motion. What's more, the two modes can even coexist in a single frame,
sometimes on a pixel-by-pixel basis. However, when objects are moving slowly,
the compromise in resolution can be noticeable. And when slow-moving objects
come to a complete stop (or still objects go into slow movement), the sudden
shift in resolution can be noticeable—and annoying.
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Sony employs a third mode, specifically for slow-moving pixels. These
are created by a sophisticated hybrid algorithm, based on seven
adjacent pixels.