SDA9400 Datasheet, PDF (23/94 Pages) Micronas – Scan Rate Converter using Embedded DRAM Technology Units

SDA 9400
6.3.4 Noise reduction
The figure below shows a block diagram of the spatial and temporal motion adaptive noise
reduction (first order IIR filter). The spatial noise reduction of the luminance differs from the spatial
noise reduction of the chrominance. The structure of the temporal motion adaptive noise reduction
is the same for the luminance as for the chrominance signal.
Block diagram of noise reduction
SNRON
YIN
TNRCLY,
TNRHOY,
TNRKOY,
TNRVAY,
TNRFIY,
NRON
TNRCLC,
TNRHOC,
TNRKOC,
TNRVAC,
TNRFIC,
NRON
UVIN
YR
Spatial
noise
reduction _YSNR
DY
Motion ^KY
detector
Motion ^KUV
detector ₁
DUV
Spatial
noise
reduction _UVSNR
UV1
0
TNRSEL
VCSNRON,
HCSNRON
Field
delay
Frame
delay
0
1
DTNRON
Field
delay
6.3.4.1 Spatial noise reduction
Normally a spatial noise reduction reduces the resolution due to the low pass characteristic of the
used filter. Therefore the spatial noise reduction of the SDA 9400 works adaptive on the picture
content. The low pas filter process is only executed on a homogeneous area. That’s why an edge
detection controls the low pass filter process and depending on the result of the edge detection the
pixels for the low pass filter are chosen. The next figure shows a block diagram of the spatial noise
reduction. For the UV signal only a simple spatial noise reduction algorithm (vertical and/or
horizontal low pass filtering) is implemented.
Micronas
23
Preliminary Data Sheet