Werbung
Verfügbare Sprachen
Verfügbare Sprachen
-C7B0S/H/X
-C7400E
-C690S/H/X
-CB400E
Pin (10) is the terminal for initialization.
When the power is turned ON, it initializes the white balance
control output of M preset value (3200°K) by means of R338, R337 and C312.
When the power is turned
OFF by D302, it rapidly discharges the charged valtage.
C-BLK is inputted in pin (9) EXT SCTL to cut the signal in the image blanking portion.
ENCP pulse is inputted in pin (2) to use as an internal clamp pulse and clock.
h
Si
apiece
Satie
pri
0
HI
h
PR2
H2
h
PR3
1
H3
h
PRA
H4
me
h
PRS
HS
h
|
PR6
H6
h
PR7
Mires
eae t e o tee a
hege D
|
PRB
|
EY
buisa eateries
® acters,
Figure 6-2 (h). Preset Reference Value Setting
. One axis correction
Diode D301 and resistor R343 are added between pin (15) and pin (14) to control one axis correction, which
limits the white balance control range to the vicinity of | axis.
The state with no one axis correction (see Fig. 6-2 (i))
For example, white is imaged in a light source of 3200°K.
At this time, the following equation is obtained.
Pin (15) voltage : Vap
= Pin (14) voltage : Vro
= Vref
Then, colour signal A on B-Y axis in the detection area is imaged.
As white balance correction is performed
by means of colour signal A, the following equations are obtained.
Ve1= Veo +a
Vai = Veo = Vref
__White shifts on - (B-Y) axis by A.
2
In the same way, colour signal A on B-Y axis in the detection area is imaged. The control potential is
expressed as follows:
Vp2
=
Ve1
+
B =
Vag
+ a + B
Vr2
= Vai = Vro = VRet
38
neath
Werbung
