SDA9400 Datasheet, PDF (29/94 Pages) Micronas – Scan Rate Converter using Embedded DRAM Technology Units

SDA 9400
6.3.6 Motion detection for scan rate conversion
The motion detection for scan rate conversion results in a motion value for each pixel. The motion
values are stored within the main memory block, read out at the high data rate and used for the
scan rate conversion. The motion detection works on luminance data. In case of VDECON>0 or
HDECON>0 the motion detection for scan rate conversion is disabled. The diagram below shows
the block diagram of the motion detection. Separate line, field and frame differences are calculated.
The result of the differences are fed to separate look up tables. The result FRD of the LUTFR (look
up table frame) depends on the frame difference and the line difference (LDMAX). The result of the
LUTFI (look up table field) FID1 or FID2 depends on the field difference and the line difference.
These three values FRD, FID1 and FID2 determine the motion value mval. The final motion value
“Motion” is generated by the postprocessing block. It is possible to alternate the behaviour of the
motion detection selecting different parameters, which will be described in detail for each block
afterwards.
Block diagram motion detection
FRD3
THRMOV THRGM _{AMMON, FRAFION}
THRESH
IN ^Line
LDDEL
Difference
THRESH
FID3
FRD3
To
movie mode and
phase detection
Y
frame
delay
Y
field
delay
Y
IN1_Frame
Difference
IN2
IN1 _Field
Difference
IN2
LUTFR ^FRD
LUTFI ^FID2
mval
ADD
Post
processing
Motion
IN1
Field
Difference
IN2
LUTFI ^FID1
IN ^Line
Difference
M
A
X ^LDMAX
MUX
LDACT
muxout
SVALLI, THLIO,
THLI1, THLI2
SVALFI, SVALFR
THFI0, THFI1,
To _MOVMO
THFI2, THFI3 Global
THFR0, THFR1, motion
THFR2, THFR3 detection
SWGM
HPE1OFF, VLEROFF
HPS1OFF, HPE2OFF
HPEXOFF, VLEXOFF
Input write parameter
Parameter
[Default value]
SVALLI
[1]
THLI2, THLI1,
THLI0
[12, 8, 4]
Subaddress
28h
29h, 2Ah
Description
Sensitivity of line difference
Threshold of line difference
Micronas
29
Preliminary Data Sheet