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Yes dither is what I meant. Interesting. Have you had a look at the subs to see if the dead pixels overlap between any subsequent subs? If you dither enough that the row of dead pixels is different on each sub then I'm back to suggesting modifying the sigma high value doing image integration.
Removing defects like this is exactly what that algorithm is designed for. It should only fail if there are multiple subs with the same defect, then then defect becomes closer to the average and a lower sigma value is needed to average it out.
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