NED
UME-0069-03
NUCLi7370AT6
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4.11 Auto white balance
The NUCLi7370AT6 has a simple function for balancing the output levels of each
channel of the sensor. This section describes how to adjust the RGB signal to the
desired level.
As an example, the procedure below describes how to adjust the RGB level to 190DN
(in 8bit mode) in the factory set pixel correction mode.
4.11.1 Note about optical adjustment
The Auto white balance adjustment function adjusts front and rear half of the CCD
’s
pixels by sampling the center 128 pixels of the sensor. Please adjust the lighting such
that this center area is targeted. If the lighting is off-center, it may result in a difference in
level across these center pixels.
4.11.2 Setting the optical adjustment conditions
①
Send the command
“C1” to set pixel correction to Factory Set Pixel Correction Mode.
②
Depending on the exposure time and light source, try to get the level as close to the
desired level as possible (in this case, 190DN, shown in the figure below)
255
128
192
64
0
7300pixel
out
put
l
evel
(
8bi
t)
190(
target value
)
Figure 4-11-2-1 output profile before auto white balance is executed