Instruction manual

Description of the data path
PIKE Technical Manual V4.0.0
117
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.
Automatic 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.
The following flow diagram illustrates the automatic white balance sequence.
Finally, the calculated correction values can be read from the
WHITE_BALANCE register 80Ch.
Note
L
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 mono-
chrome pixels in the image.
• Automatic white balance can be started both during
active image capture and when the camera is in idle
state.
Figure 60: Automatic 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