Chromasens CD40127_R02 allPIXA_pro_User Manual.docx
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9.4.7 Set gain control stop by variance
Name
Name
Set gain control stop by variance
Function
Sets the pause condition for the white control.
Channels
All
Unit
Integer
Dependency
Takes only effect if the
Stop gain control by variance value
check box is
selected in the
White control mode
area.
Notes
White control pauses if medium variance of the values of the pixels in the
white reference area is higher than the specified value.
Camera:
Value:
Lower limit
All
0
Upper limit
All
65535
During the scan, the camera is set to automatically control the image brightness using the
implemented function “Automatic white control”. The control mechanism of the camera uses
the reference area on the object to adapt the camera gain values as defined within the camera
parameters.
In rare situations, the
Gain control stop factor
parameter cannot be used successfully,
because medium brightness is similar to that of the expecte object if no object is on the
transport. But in these cases often brightness variance of the pixels is much higher if no object
is present.
9.4.8 Set active channels for white control
Name
Name
Set active channels for white control
Function
Determines which channels are active during automatic white and tap
balancing
Channels
All
Unit
Bool
Dependency
Applies only to the automatic gain control functions such as white balancing
and tap balancing.
Notes
If you
work with “white” illumination, leave all channels set to “Enabled”
(Standard use of the allPIXA pro).
This function is useful if you work with different lighting conditions.
If you are for example working with three different light setups for the
different color channels, you could turn on the lights for one channel, disable
the other “Active channels” and perform white and tap balancing.
After this you run through the same procedure for the other channels. If you
disable the channel, the old values for the white or tap balancing are not
overwritten.
Camera:
Value CST:
Lower limit
All
0
Upper limit
All
1
For more details, see section 8.2.4.
