SDA9401 datasheet(21/69 Pages) ETC

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Micronas

Preliminary Data Sheet

SDA 9401

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

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 9401 works adaptive on the picture

content. The low pass 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.

YIN

Spatial

noise

reduction

Field

delay

Motion

detector

Field

delay

UV1

Motion

detector

UVIN

TNRSEL

DUV

Spatial

noise

reduction

SNRON

VCSNRON,

HCSNRON

TNRCLY,

TNRHOY,

TNRKOY,

TNRVAY,

TNRFIY,

NRON

TNRCLC,

TNRHOC,

TNRKOC,

TNRVAC,

TNRFIC,

NRON

KUV

YSNR

UVSNR

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