Allied Vision Technologies F-131B, Technical Manual, Page: 60 / 183

Description of the data path
Finally, the calculated correction values can be read from the WHITE_BALA
8.3.2 Automatic white balance
There is also an Auto white balance feature reali , which ou es the color
characteristics of the image.
As a reference, it uses a grid of at least 300 samples equally spread over the area of interest or a
fraction of it. The position and size of the control area (Auto_Function_AOI) can be set via the
following advanced registers.
NCE register 80Ch.
zed continu sly optimiz
Register Name Field Bit Description
0xF1000390 AUTOFNC_AOI Presence_Inq [0] Indicates presence of this
feature (read only)
[1..3] -
ShowWo [4 Show rkArea ] work area
[5] -
ON_OFF [6] Enable/Disable AOI
[7..31] -
0xF1000394 AF_AREA_POSITION Left [0.. rk ion 15] wo area posit
Top [16..31]
0xF1000398 AF_AREA_SIZE Width [0..15] work area size
Height [16..31]
Table 31: Advanced register: AUTOFNC_AOI
AUTOFNC_AOI affects the auto shutter, auto gain and auto white balance features and is
independent of the Format7 AOI settings. If this feature is switched off the work area position
a
llow the t active image siz
The possible increment of this work-area position and size is 12
mera
automatically adjusts the settings to allowed values (see below for valid va
Left, Top
0, 128, 256, 384, 512, 768, 102
Width, Height
128, 256, 384, 512, 768, 1024…
Table 32: Legal values for AF_AREA_SIZE
Due to the fact that the active image size might not be dividable by 128 without a remainder,
the auto function AOI work-area size might be greater.
This allows for the positioning of the work-area to be at the bottom of the
E.g. if the active image size is 640 x 480 pixel the camera accepts a maxi
2 pixel
as the auto function AOI work area (if the control area position is 0:0).
A other case is fo outdoor applications: the
exc rom
reference levels.
nd size fo curren e.
8 pixels. The ca
lues):
4…
active image.
mum of 640 x 51
n r sky will be luded f the generation of the
MARLIN Technical Manual
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