Baumer VCXG - Pixel Correction for Abnormal Pixels

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9.5 Pixel Correction
9.5.1 General information
A certain probability for abnormal pixels - the so-called defect pixels - applies to the sen-
sors of all manufacturers. The charge quantity on these pixels is not linear-dependent on
the exposure time.
The occurrence of these defect pixels is unavoidable and intrinsic to the manufacturing
and aging process of the sensors.
The operation of the camera is not affected by these pixels. They only appear as brighter
(warm pixel) or darker (cold pixel) spot in the recorded image.
Warm Pixel
Cold Pixel
Charge quantity
„Normal Pixel“
Charge quantity
„Cold Pixel“
Charge quantity
„Warm Pixel“
Figure36►
Distinction of "hot" and
"cold" pixels within the
recorded image.
Figure37►
Charge quantity of "hot"
and "cold" pixels com-
pared with "normal"
pixels.