CD40047_R04_allPIXA_User-Manual.docx
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4.10 White balancing with a closed-loop control
To keep the video values stable on a white reference target, the allPIXA camera supports an
automatic adjustment of the internal gain values. Therefore, a closed loop can be established
which enables an automatism of keeping the white-point stable, even if there are brightness or
color temperature changes in the illumination. Usually, automatic camera functions use the
brightest point for adjusting the best result to get the white color.
The allPIXA camera permits to arbitrarily define the area of an image chosen as reference and
you are also able to set the reference values (target values) separately for each channel.
Figure 15: Closed loop control for white balancing
This function can be used for:
A single setup process with a static white reference in front of the camera during its
installation.
Adjusting the camera continuously during the scanning process. Therefore, it is possible
to compensate the warming up or the aging of the light source.