Guppy PRO Technical Manual
V4.1.2
90
Auto white balance
can also be enabled by using an external trigger. However,
if there is a pause of >10 seconds between capturing individual frames this
process is aborted.
AUTOFNC_AOI affects the auto shutter, auto gain and auto white balance
features and is independent of the Format_7 AOI settings. If this feature is
switched off the work area position and size will follow the current active
image size.
Within this area, the R-G-B component values of the samples are added and
used as actual values for the feedback. The following drawing illustrates the
AUTOFNC_AOI settings in greater detail.
The algorithm is based on the assumption that the R-G-B component sums of
the samples are equal, i.e., it assumes that the mean of the sampled grid pixels
is to be monochrome.
Note
The following ancillary conditions should be observed for
successful white balance:
•
There are no stringent or special requirements on the
image content, it requires only the presence of equally
weighted RGB pixels in the image.
•
Auto white balance
can be started both during active
image capture and when the camera is in idle state.
Note
Configuration
To set position and size of the control area
(Auto_Function_AOI) in an advanced register, see
.
Figure 36: AUTOFNC_AOI positioning
AF
_AREA_
S
IZE: Hei
gh
t: n x 4
AOI: X-Size
AF_AREA_POSITION: Left, Top
Sampling grid for Auto-Function
AOI: Y-Size
AF_AREA_SIZE: Width: n x 4
0,0
