11
Basic Functions
When ICR is ON
There are threshold levels at which ICR is switched
from ON to OFF. Usually, the 1st threshold level is
used to switch ICR from ON to OFF.
The following figure shows the process by which ICR
is switched from ON to OFF.
Reference level
It takes about 1 second after ICR is switched to ON for
AE to stabilize, then data on luminance is obtained for
about 3 seconds. Averaged data for that 3 seconds is
used as the reference level.
Timing when ICR is switched from ON to OFF
•When the level of “(current luminance) - (reference
level)” continues to exceed the 1st threshold level for
about 5 seconds, ICR is switched from ON to OFF.
• If the brightness reaches a level at which it continues
to exceed the 2nd threshold level for more than 5
seconds, ICR will also be switched from ON to OFF.
Notes
Possible causes why ICR may not be switched from ON to
OFF are as follows.
• The value of the 1st threshold level is not set properly.
• Due to a sudden change of luminance just after ICR has
been switched to ON, the reference level may not be
calculated correctly.
In the cases described above, ICR will not be switched to
OFF until the luminance reaches the 2nd threshold level.
Camera ID
The ID can be set up to 65,536 (0000 to FFFF). As this
will be memorized in the nonvolatile memory inside
the camera, data will be saved regardless of whether it
has been backed up.
Effect
It consists of the following function.
• Black White: Monochrome Image
New VISCA Commands
The following two commands have been added.
• Register Set command
Changing the value of the register of the camera
control CPU directly enables use of a large number of
modes.
Note
After changing the command, be sure to turn the camera off once,
and then turn on again. Otherwise the new command will not
become effective and the mode will not be changed.
• Auto ICR threshold Adjustment
This feature allows you to change the hysteresis
width of the auto ICR by setting the threshold of
Auto ICR ON or OFF.
T1: 1st threshold level
T2: 2nd threshold level
T3: 3rd threshold level
a) Luminance level of the subject
b) Luminance when the IR cut filter is not attached
c) The luminance crops below the 3rd threshold level.
d) “(Current luminance) - (Reference level)” is higher than the
1st threshold level.
e) The luminance is higher than the 2nd threshold level.
f) Reference level
g) The FCB camera checks the luminance.
h) The reference level is determined within the predetermined
time
Automatic ICR ON/OFF process
Function
Register set
Auto ICR
threshold
adjustment
Syntax
8x 01 04 24 mm 0p 0p ff
8x 01 04 21 00 00 0p 0p ff
dB
pp (h)
Note
VISCA bit rate
Frame rate
Digital I/F format
selection register
Variable Auto ICR
threshold
1101618202224
01 0A 10 12 14 16 18
VISCA Baud Rate
Frame Rate
IF Mode
Register #
mm
00
70
71
Value
pp
00
01
02
01
02
01
02
9600 bps
19200 bps
38400 bps
29.97 fps
25 fps
Progressive
Interlace (REC656 Only)
