[lansing]

Originally Posted by VoodooFX

I think you are talking about adaptive binarization, would be nice to see such algos ported to Synths, here is one paper on it Comparison of Niblack inspired Binarization Methods for Ancient Documents.

Wolf's algo is pretty good, paper claims that Fang and NICK is even better.

Here is paper about improving such algos with preprocess Improvement of Image Binarization Methods Using Image Preprocessing with Local Entropy Filtering

No, that algorithm was made specifically to filter text from old text books.