Pike Technical Manual
V5.2.0
136
Description of the data path
This feature uses the assumption that the R-G-B component sums of the samples
shall be equal; i.e., it assumes that the average of the sampled grid pixels is to
be monochrome.
If the image capture is active (e.g.
IsoEnable
set in register 614h), the frames
used by the camera for white balance are also output on the 1394 bus. Any pre-
viously active image capture is restarted after the completion of white balance.
The following flow diagram illustrates the
one-push white balance
sequence.
Finally, the calculated correction values can be read from the WHITE_BALANCE
register 80Ch.
Auto white balance (AWB)
There is also an
auto white balance
feature available which continuously opti-
mizes the color characteristics of the image.
For the white balance algorithm the whole image or a subset of it is used.
Note
The following ancillary conditions should be observed for suc-
cessful 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.
Figure 73:
One-push white balance
sequence
Pause image
capture
Capture image
via one-shot
Calculate and
set correction
values
Restart image
capture if
necessary
Repeat steps
nine times
