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SP-12000M-CXP4 / SP-12000C-CXP4
ALC (Automatic Level Control) Function
The ALC (automatic level control) function combines the automatic gain control and automatic
exposure control functions, and is capable of handling changes in various brightnesses.
The function operates as follows in response to changes in brightness.
Change from bright to dark: ASC
AGC
Change from dark to bright: AGC
ASC
Change in brightness
Fixed at max. ASC value
Fixed at min. ASC value
Fixed at min. gain value
AGC
Max
AGC operation
Max. to min. (user specified)
Operation during change
from dark to bright
Operation during change
from bright to dark
ASC operation
Max. to min. (user specified)
ASC (auto shutter) operation
AGC operation
Dark
Bright
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To use the ALC function
Set [Gain Auto] or [Exposure Auto] or both to [Continuous] mode. Configure the minimum value,
maximum value, etc. for AGC and ASC under [JAI Custom Control].
The target video levels for AGC and ASC are configured in [ALC Reference]. For example, when [ALC
Reference] is set to 100%, video levels will be maintained at 100% for AGC and ASC.
■
Automatic gain level control
Set [Gain] to [Continuous].
Detailed Settings for Gain Auto (Automatic Gain Level Control)
When [Gain Auto] is set to [Continuous], you can configure the conditions for automatic adjustment in
detail.
Item
Description
ALC Reference
Specify the target level for automatic gain control. (This setting is
also used for automatic exposure control.)
ALC Area Enable All
Select whether to specify all areas as auto gain metering areas
or whether to specify the areas individually.
[0]: Specify areas as auto gain metering areas (16 areas)
individually.
[1]: Specify all areas as auto gain metering areas.
ALC Area Selector
Individually select any of 16 areas for automatic gain metering.
(This setting is also used for automatic exposure control.)
ALC Area Enable
Select [True] to enable the metering area selected in [ALC Area
Selector], or select [False] to disable it.
AGC Max.
Specify the maximum value for the automatic gain control range.
AGC Min.
Specify the minimum value for the automatic gain control range.
AGC/ASC Control Speed
Specify the reaction speed for automatic gain control. (This
setting is also used for automatic exposure control.)