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KAM-DEC-4ADC-MUX Instruction Manual
KAM-DEC-4ADC-MUX Links and Web Pages
3D Decoder Control
The composite input is processed through a 3D decoder which offers three
preset decoder modes and a user defined mode. Preset modes are selected
according to the amount of motion present in the input video.
Each decoder mode has a set of default values when selected. User controls
are provided for setting motion threshold, the type of comb filtering, luma
and chroma threshold levels, and luma bandwidth.
To determine the best preset decoding mode for your application, select
one of the 3D preset decoding modes at the bottom of the 3D Decoder
Control section depending on the amount of motion in the input video:
•
Low Motion
– this is a 3D temporal filter ideal for applications where there
is little motion in the video, such as scenes involving sitting and other
scenes involving little motion.
•
Mixed Motion
– a general purpose filter, this is the default choice for most
video applications involving mixed motion.
•
High Motion
– a 2D adaptive filter is employed for handling change in
motion recommended for video where there will be a great deal of
motion such as sports. Once motion is detected in a scene, the high
motion decoder should be used.
•
User Defined
– changing any preset value in the Motion decoders will
switch to the user mode.
After setting the preset decoder mode for the amount of motion in the
video application, use the following controls to maximize video quality.
3D Motion Threshold
This control sets the amount of motion between pixels that is detected in
the incoming video. The motion detector processes the magnitude differ-
ence between luminance and chrominance on successive incoming frames.
This difference is then compared to the 3D motion threshold.
For scenes with fast motion, using the
High Motion
preset decoder sets the
default threshold to value of 5. This low threshold indicates that the pixels
will be changing faster and will be compared for motion more often.
Whereas, for a low motion scene, using the
Low Motion
preset decoder, the
default threshold value is set for 60, indicating that the pixels will be
changing less often so motion is detected at a higher threshold. For a
general purpose video input, using the
Mixed Motion
, the default threshold is
set for 25.
Use the 3D Motion Threshold control to maximize the video for motion.
You may use the default threshold values of each preset decoder as a guide
to setting the 3D Motion Threshold and the right preset decoder mode.
Once the default threshold for a decoder type is exceeded, try switching to
another decoder preset.
