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6.2.6.1 White Balance
As described in chapter 6.2.2.1, the structure of the sensor differentiates Green pixels facing Blue or Red pixels.
Then the white balance is associated with 4 color Gains :
-
Red Gain
-
Green
Red
Gain
-
Green
Blue
Gain
-
Blue Gain
The Color Selection or enabling (Image Format Chapter) can affect the way you’re performing the white balance :
For example, if you disable the Blue and the Red color, the “White Balance” will be performed only between the
two Green Gains.
The dissociation of Green (blue) and Green (Red) is justified by the possible difference of response of the two
types of Green because of their respective neighbor color influence and then the necessity to tune them
separately.
As usual, for a perfect White balance, provide to the Camera a non-saturating white (gray) target in the center of
the sensor.
The White balance has to be performed after the Flat Field Correction as each color is performing its own FFC with
its own reference.
In any case, the best tuning of the Camera Gains is performed from the left to the right of the Gain Chain described
above : Preamp Gain first and quarter Gains last (if required).
The Auto White balance can be started only if the Camera is grabbing (start Acquisition Active) otherwise
No action will be done while launching the Auto White Balance calibration.
Feature Description
PreampGain
Set pre amplifier gain (analog gain) to:
x1: (0dB)
x2: (6dB)
x4: (12dB)
Gain Set Adjustment gain from 0dB to +8 dB
Digital Quarter Gain Selector Select the Quarter Gain (1-4) to be set by Digital Quarter Gain
Digital Quarter Gain Value of the Quarter Gain selected by the Digital Quarter Gain Selector (-128 to +127)
Quarter Balance Enable Enables the quarter Gains (0 : Gains disabled).
White Balance Enable Enables the White Balance Gains (below)
0 : Disabled
1 : Enabled
Digital Red Set gain for Red color form 0 (0db) to 6193 (8dB)
Digital Blue Set gain for Blue color form 0 (0db) to 6193 (8dB)
Digital Green (Red) Set gain for Green
Red
color form 0 (0db) to 6193 (8dB)
Digital Green (Blue) Set gain for Green
Blue
color form 0 (0db) to 6193 (8dB)
AutoWhiteBalanceStart Auto White Balance calibration Control :
0 : Abort the White Balance
1 : Launch the White Balance Calibration