Description of the data path
PIKE Technical Manual
V5.0.0
131
This feature uses the assumption that the R-G-B component sums of the sam-
ples shall be equal; i.e., it assumes that the average of the sampled grid pix-
els 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 previously 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.
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 70:
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
