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Figure 3: Defective pixel data are written to the camera (since driver version 2.17.1 and firmware version 2.12.406)
While opening the camera, the camera will load the defective pixel data from the camera. If there are pixels in the
filter available (via calibration), nevertheless you can load the values from the camera. In this case the values will
be merged with the existing ones. I.e., new ones are added and duplicates are removed.
1.18.2.1.4 Defect Pixel correction using mvImpactAcquire After a defect-list is generated, a correction can
be performed using mvIMPACT Acquire.
To correct the defective pixels various substitution methods exist:
1. "Replace 3x1 average"
which substitutes the detected defective pixels with the average value from the left and right neighboring pixel
(3x1)
2. "Replace 3x3 median"
which substitutes the detected defective pixels with the median value calculated from the nearest neighboring
in a 3 by 3 region
3. "Replace 3x3 Filtered Data Averaged"
which substitutes and treats the detected defective pixels as if they have been processed with a 3 by 3 filter
algorithm before reaching this filter
Only recommended for devices which do not offer a defective pixel compensation; packed RGB or packed
YUV444 data is needed. See enumeration value dpfmReplaceDefectivePixelAfter3x3Filter
in the corresponding API manual for additional details about this algorithm and when and why it is needed
MATRIX VISION GmbH
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