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Correction Algorithm
9.5.2
On cameras of the Baumer VisiLine IP series, the problem of defect pixels is solved as
follows:
Possible defect pixels are identified during the production process of the camera.
▪
The coordinates of these pixels are stored in the factory settings of the camera.
▪
Once the sensor
▪
readout is completed, correction takes place:
Before any other processing, the values of the neighboring pixels on the left and the
▪
right side of the defect pixels, will be read out. (within the same bayer phase for
color)
Then the average value of
▪
these 2 pixels
is determined to correct the first defect
pixel
Finally, the value of the second defect pixel is is corrected by using the previously
▪
corrected pixel and the pixel of the other side of the defect pixel.
The correction is able to correct up to two neighboring defect pixels.
▪
Defect Pixels
Average Value
Corrected Pixels
9.5.3 Defectpixellist
As stated previously, this list is determined within the production process of Baumer cam-
eras and stored in the factory settings.
Additional hot or cold pixels can develop during the lifecycle of a camera. In this case
Baumer offers the possibility of adding their coordinates to the defectpixellist.
The user can determine the coordinates
*)
of the affected pixels and add them to the list.
Once the defect pixel list is stored in a user set, pixel correction is executed for all coordi-
nates on the defectpixellist.
*)
Position in relation to Full Frame Format (Raw Data Format / No flipping).
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