SDA9410
Preliminary Data Sheet
Input signal processing
5.4.3.2 Motion adaptive temporal noise reduction
The equation below describes the behaviour of the temporal motion adaptive noise
reduction filter. The same equation is valid for the chrominance signal. Depending on the
motion in the input signal, the K-factor Ky (Kuv) can be adjusted between 0 (no motion)
and 15 (motion) by the motion detector. The K-factor for the chrominance filter can be
either Ky (output of the luminance motion detector, TNRSEL=0) or Kuv (output of the
chrominance motion detector, TNRSEL=1). For the luminance and chrominance signal
the delay of the feed back path can be either a field delay (DTNRON=1) or a frame delay
(DTNRON=0) (block diagram of noise reduction).
Equation for temporal noise reduction (luminance signal)
1 + Ky
æ
ö
YOUT = ---------------- ΘYSNR – YRΡ + YR
è
16
Equation for temporal noise reduction (chrominance signal)
1 + K
16
æ
ö
UVOUT = ------------- ΘUVSNR – UV1Ρ + UV1;K = ΘKy;KuvΡ
è
(compare "Block diagram of noise reduction" on page 40)
The Figure 16 shows the motion detector in more detail. Temporal noise reduction can
be switched off by NRON (NRON=0). The I²C Bus parameter TNRFIY/C switches
between a fixed noise reduction K-factor TNRVAY/C (TNRFIY/C=0) or a motion adaptive
noise reduction K-factor (TNRFIY/C=1).
TNRCLY/C+1 TNRKOY/C+1
TNRFIY/C NRON
Motion
Motion
1
LUT
DY/UV
detection
1
MUX
0
0
MUX
Ky/uv
0
15
TNRHOY/C TNRVAY/C
Figure 16
Block diagram of motion detector
In case of adaptive noise reduction the K-factor depends on the detected “Motion” (see
Figure 16). The “Motion”-Ky/Kuv characteristic curve (LUT) is fixed inside the SDA
9410, but the characteristic curve can be changed by two I²C Bus parameters: TNRHOY/
C and TNRKOY/C. TNRHOY/C shifts the curve horizontally and TNRKOY/C shifts the
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Micronas
MICRONAS [ MICRONAS ]
