Auto White Balance; Gain - IAI AT-140GE User Manual

2. Flat shading compensation
In this mode, each channel can be adjusted to achieve flat characteristics.
Fig.49 Conceptual drawing for flat shading compensation
Note: The maximum level of shading compensation is 25%. Under certain
circumstances relating to lighting conditions or lenses used, it may not be
possible to fully compensate for shading.
The following applies to the lens consideration.
Use a lens with a 1/2-inch optical format designed for a 3CCD camera. The
shading will depend on the focal length and F number. Wide angle lenses or
using a lens with the iris fully open may cause the shading characteristics to
deteriorate.
In order to perform the shading compensation,
Shading correction mode: Select Flat shading or Color shading
Shading Enable: True
Shading selector: Select R, G or B
Shading correct: Perform Shading Calibration
In order to store the data, select user I or 2 in User selector and activate User set
load.

11.3. Auto White balance

The AT-140GE has 2 auto white balance modes: one-push auto white balance or
continuous auto white balance. Both modes adjust the R channel and B channel using
the G channel as the reference, in order to set all three channels equal.
The reference color temperature is 7800K.
The measuring area for the auto while balance is the same as the area of the output
(AOI).
Tracking range
Adjustable range(R and B)
Store the setting value
Note: In continuous mode, if the white part is not enough to make an adjustment, the white
balance may not achieve a proper white color.
Note: The completion of one-push auto white requires a maximum of 5 seconds to complete.

11.4. Gain

The analog gain and the digital gain can be set externally.
The gain functions are as follows.
AT-140GE
In case of color shading, select R or B
Continuous
0.5 to 2.0
-6dB ～ +6dB
No
- 60 -
One push OFF(Manual)
0.5 to 2.0
-6dB ～ +6dB -6dB ～ +6dB
Yes
0.5 to 2.0
Yes