First of all, I'm not aware of any processors outside of those by DVDO which offer automatic CUE and ICP error detection. Many processors have manually controlled CUE filters (or even permanently-on filters), but I haven't seen any others which actually detect the presence of these errors and only then attempt to 'correct' them.
I put 'correct' in quotes, because in all cases that I know of the errors are not actually corrected, but rather the artifacts which result from those errors are filtered out. While in some cases it might be possible to actually correct the errors, you'd have to know exactly how the upconversion was performed in order to reverse the process and eliminate the error. This in general isn't known, so a more general filter-based approach is normally used.
This is typically done by a vertical chroma filter which reduces the vertical bandwidth of just the chroma signal, while leaving the luma signal intact. No such process is perfect, of course, but the end result is usually much better than having the artifacts there in the first place. In many cases the results are very close to not having the error in the first place. This depends to some extent on the severity of the error and how the chroma upsampling was actually done.
- Dale Adams