PEDL87V21071-01
OKI Semiconductor
ML87V21071
2. Video Signal Processing Functions
2.1 Motion-Adaptive 3D Noise Reduction
This IC performs noise reduction first by detecting noise and predicting motion using frame recursion, field
recursion, and line correlation, then by performing noise subtraction while performing motion compensation for
the detected noise. Moreover, it achieves adaptive noise reduction by synthesizing four NR data items based on
prediction of motion.
However, when INPR is set to 1, the field recursion stops and adaptive noise reduction is performed by the two
NR data items, frame recursion and line correlation.
•
Principle of Noise Reduction
Difference between the current field data and the filed data preceding one frame, one field, or one line is
extracted as time motion and noise independently for luminance and chrominance signals.
The low gain portion of this data is judged to be noise and the high gain portion to be motion and is extracted
as motion level detection noise.
The noise component extracted here is subjected to motion prediction by adjacent motion level and adjacent
code, then further subjected to compensation based on motion and is regarded as the final noise component.
Finally, noise reduction is carried out by subtracting this final noise data from the current field data.
+
Luminance
input data
Luminance
output data
-
-
Luminance noise detection
Limiter
+
-
Motion
compen-
sation
Non-
linear filter
-
Field
memory
MSB
Motion
detection
LPF
NR recursive data
+
Chrominance
input data
Chrominance
output data
-
-
Chrominance noise detection
+
-
Luminance
interlock
motion
Chrominance
motion level
compen-
Non-
linear filter
-
Limiter
sation
compensation
Field
memory
Motion
detection
LPF
NR recursive data
Figure F2-1 (1) Noise Detection Type Noise Reduction Configuration
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