ADS Technologies USBAV-708 INSTANT VIDEOMPX, User Manual

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Slow psychovisual enhancement mode analyses
each block and the blocks surrounding it in turn
to ensure any enhancement does not introduce
significant blocking and ringing artifacts, thus slow
mode is less likely to introduce artifacts than fast
mode.
QUICK GUIDE
Slow psychovisual enhancement
When encoding a multipass video without MV re-use enabled you can save
time by enabling psychovisual enhancements from the second-last pass
onwards only. This will have a minimal impact on quality but can potentially
reduce encoding time substantially.
Slow psychovisual enhancement mode generally produces a less intense
effect than Fast psychovisual enhancement mode and lowers the probability
that visible artifacts will be introduced as a consequence of the process.
When choosing which psychovisual enhancement mode to use do not equate
speed with quality. Each psychovisual enhancement mode produces slightly
different results.
Care should be taken when applying psychovisual enhancement to noisy
sources as undesired results can occur. If your source is a particularly old
video or has been acquired via analogue capture you may need to apply
Source pre-processing (described later) to reduce the level of noise present
when applying psychovisual enhancement.
Psychovisual enhancement should not be applied when encoding as
interlaced. The psychovisual enhancement system is not yet interlace-aware
and may enhance combing artifacts undesirably.
Psychovisual enhancements:
-psy <mode>
Mode
is one of:
0 Disable psychovisual enhancement
1
Fast psychovisual enhancement
2 Slow psychovisual enhancement