34
10.3.2 Correction Algorithm
On Baumer LXG cameras with
Visual Applets
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 with the same
color on the left and the right side of the defect pixel, will be read out
▪
Then the average value of these pixels is determined
▪
Finally, the value of the defect pixel is substituted by the previously determined
average value
This works horizontally and vertically. With this approach whole defect rows and defect
columns can be corrected.
Defect Pixel
Average Value
Corrected Pixel
10.3.3 DefectPixelList
As stated previously, this list is determined within the production process of Baumer cam
-
eras and stored in the factory settings. This list is editable.
Figure 18 ►
Schematic diagram of
the Baumer pixel
correction.
