Allied Vision Technologies MF-145B2 Manuel d'instructions télécharger pdf (Page 68)

Marlin Technical ManualV.2.7.0

Description of the data path

The following flow diagram illustrates one-push white balance sequence.

Finally, the calculated correction values can be read from the WHITE_BALANCE

Auto white balance (AWB)

The auto white balance feature continuously optimizes the color characteristics

of the image.

For the white balance algorithm a grid is used of at least 300 samples equally

spread over the area of interest or a fraction of it.

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 pro-

cess is aborted.

Figure 36: One-push white balance sequence

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.

• Auto white balance can be started both during active

image capture and when the camera is in idle state.

Pause image

capture

Capture image

via One_shot

Calculate and

set correction

values

Restart image

capture if

necessary

Repeat steps

six times

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Allied Vision Technologies MF-145B2 Manuel d'instructions Page 68