ADS Technologies USBAV-708 INSTANT VIDEOMPX, User Manual

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Fast psychovisual enhancement mode attempts
to manipulate the DCT co-efficients selectively
so that the resulting noise in the decoded image
is positioned where it will be least visible, for example
in areas of strong texture.
QUICK GUIDE
Fast 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.
Fast psychovisual enhancement mode generally produces a more intense
effect than Slow psychovisual enhancement mode.
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