ALLIED Vision Technologies Marlin F-201 - Manual (Page 72)

Description of the data path
MARLIN Technical Manual V2.4.0
72
One-push automatic white balance
The camera automatically generates frames, based on the current settings of
all registers (GAIN, OFFSET, SHUTTER, etc.).
For white balance, in total 6 frames are processed and a grid of at least 300
samples is equally spread over the work area. This area can be the field of
view or a subset of it. The R-G-B component values of the samples are added
and are used as actual values for both the one-push and the automatic white
balance.
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 outputted on the 1394
bus. Any previously active image capture is restarted after the completion of
white balance.
Figure 37: U/V slider range
Note
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Configuration
To configure this feature in control and status register (CSR):
See
Table 29: White balance register on page 71.
Note
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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.