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I was confused by that as well. From what I understood how JBIG2 worked, those symbols don't even have to have the same size everywhere (as would be quite common with proportional fonts anyway). So there is no "patch size" per se; just the low resolution confusing the classifier.

I doubt the patch size is even configurable, as identified patterns can be scaled accordingly. However the author is not to blame, because JBIG2 is poorly documented and the implementation of the compressor is not specified in the standard.

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