2011

Adjusting the Adaptive Threshold
Adaptive deinterlacing is essentially controlled by the Motion Threshold,
which gives a trade-off between interlacing artifacts and preservation of detail.
This threshold indicates at what point a pixel is considered to be in motion.
All pixels above this threshold are treated as moving and are interpolated
spatially, meaning there is a loss of detail because every second line is thrown
away. Pixels below this threshold are considered to be static parts of the scene
and we preserve both fields of input, i.e., we use temporal interpolation. If
you place the motion threshold at 100, then we consider all pixels to be static
and output both fields, essentially not deinteracing, as seen in the following
image:
The above image has great detail in the static grey rock region (because it keeps
both fields of input), but has objectionable interlacing feathering in the waving
baton. If you push the threshold all the other way to 0, as in the following
image, the interlacing artifacts disappear, but the static brick region loses
798 | Chapter 33 Video Tools