UPD64084 NEC, UPD64084 Datasheet - Page 20

• Manufacturer Part Number: UPD64084
• Description: THREE-DIMENSIONAL Y/C SEPARATION LSI WITH ON-CHIP MEMORY
• Manufacturer: NEC

6. MOTION DETECTION BLOCK
difference. This motion factor is used as a mixture ratio to indicate how the frame and line comb filter outputs are
mixed. This block is used in the YCS mode.
6.1
both frames.
6.2
and previous frames is obtained, its absolute value, obtained by limiting the frequency band for the Y signal difference
using an LPF, is output as a Y frame difference signal, or a DY signal.
6.3
and previous frames is obtained, its absolute value, obtained by limiting the frequency band for the C signal difference
using an LPF, is output as a C frame difference signal, or a DC signal. Because the phase of the C signal is inverted
between frames, the absolute values of the C signals of both frames have been obtained before the difference is
obtained.
6.4
circuit performs coring according to the DYCOR and DCCOR settings on the serial bus to block weak signals like noise.
The gain adjustment circuits ahead perform gain adjustment according to the DYGAIN and DCGAIN settings on the
serial bus to specify the sensitivity of the motion factor. These outputs are limited to a 4-bit width, and one having a
higher level is selected for output by the maximum value selection circuit. The selected signal is expanded horizontally,
then output as a final motion factor.
6.5
serial bus.
20
This block generates a 4-bit motion factor indicating an inter-frame motion level from the video signal inter-frame
Before obtaining an inter-frame difference, the line comb filter performs Y/C separation for the composite signals of
The DY detection circuit detects a Y signal inter-frame difference. After a Y signal difference between the current
The DC detection circuit detects a C signal inter-frame difference. After a C signal difference between the current
The motion factor generation circuit generates a 4-bit motion factor from the DY and DC signals. The first coring
The motion factor can be set to 0 (forced stop) or a maximum value (forced motion) using the MSS signal on the
Line Comb Filter
DY Detection Circuit
DC Detection Circuit
Motion Factor Generation Circuit
Forcible Control for The Motion Factor
Composite
memory
Frame
input
H
H
H
H
(previous frame)
(current frame)
Line comb
Line comb
filter
filter
Figure 6-1. Motion Detection Block Diagram
Y
Y
C
C
1
2
1
2
|x|
|x|
DC detection
DY detection
Data Sheet S16021EJ2V0DS
LPF
LPF
circuit
circuit
|x|
|x|
DY
DC
DCCOR
DYCOR
Coring
Coring
DYGAIN
DCGAIN
Gain
Gain
Maximum
section
value
LIM
LIM
generation circuit
Motion factor
Expansion
circuit
To the mixer circuit
4
0
MSS
0
PD64084
MD[3:0]
0
F
0
MSS
1