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Setup Manual
D.1 White Balance
The White Balance function is the most important function for consistent image quality.
With the White Balance function changes in the scanned documents can be
compensated. To get the best quality while scanning, it is recommended to execute the
White Balance function in regular intervals.
D.1.1
Information about the White Balance Function
The scanner has an integrated light source with known and stable quality, existing of white
LEDs of the most current design.
At the first step during the white balance the scanner’s sensibility is set in a way that the
brightest zone results in a nearly saturated output signal level. This ensures that the
maximum sensitivity range is used.
After this adjustment, irregularities in the light distribution can be measured. These
irregularities can be caused by ambient light source, by irregularities in the optic or from
uneven brightness of the illumination.
The result of this measurement results in a corrective function, which will set the
brightness over the whole scan area to a consistent level.
The reference target used for the white reference function has an important influence at
the result of the white balance. The white reference target consists of a material which
diffuses the light of the camera. If the test target has wrinkles or dirt visible to the eye on it,
they are also visible for the camera. These areas will be over-compensated.
Although the internal software can eliminate those faults up to a certain degree, it comes
to unfavorable results if the reference target does not exist of the defined quality.
Is the reference target of the defined quality, the scanner will be successfully calibrated.
Calibration means, that the “White” of the reference target with the described illumination
results in a “White” at the digital output.
The regular performance of the white balance function is recommended in order to obtain
the best scan results.
Summary of Contents for Wide Tek WT 36C
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