DFK 33UX252 Technical Reference Manual
35
Camera Controls
5.8.2
White Balance Mode
The default auto white balance algorithm is
Gray World
. It is selected by setting the
White Balance Mode
accordingly. The
Gray World
algorithm operates under the
assumption that the average color of a scene is near gray and adjusts the white balance
coefficients so the average color of the resulting image is gray as well. In the case
where this assumption is wrong (e.g. the camera is pointing at a blue carpet), the auto
white balance algorithm will select coefficients that do not result in a visually accurate
image.
To avoid the problems posed by the
Gray World
algorithm, the
Temperature
mode can
be used. This mode operates by trying to determine the color temperature of the light
source.
Parameter
White Balance Mode
Gray World
Use the
Gray World
model
Temperature
Use the
Temperature
model
USB3 Vision: GenICam
BalanceWhiteMode
Video4Linux2
Whitebalance Mode
VCD Property
VCDID_WhiteBalance
\VCDElement_WhiteBalanceMode
To assist the automatic white balance temperature detection,
White Balance Auto Preset
can be used to limit the range of valid color temperatures.
Parameter
White Balance Auto Preset
Any
Allow any color temperature
Auto Warm White
Limit color temperature to approximately 2500-4000 K
Auto Cool White
Limit color temperature to approximately 4000-5800 K
Auto Daylight
Limit color temperature to approximately 5700-7500 K
Auto Deep Shade
Limit color temperature to approximately 7500-10000 K
USB3 Vision: GenICam
BalanceWhiteAutoPreset
Video4Linux2
Whitebalance Auto Preset
VCD Property
VCDID_WhiteBalance
\VCDElement_WhiteBalanceAutoPreset
5.8.3
Manual White Balance
If
Auto White Balance
is not enabled, the amplifiers for the red, green and blue channels
can be controlled manually.
