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A lot of work has been done in the field of document image binarization. Is it a closed research field or still an interesting challenge area? I am new in the field, and just curious.

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closed as primarily opinion-based by Marcus Müller, MBaz, lennon310, Peter K. Aug 23 '17 at 19:49

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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First, in science, a field is rarely closed, sometimes asleep only. Resistance to low-contrast, real-time, badly scanned, composite documents/writers or from aging medium seem to remain challenges, in similarity with other digital data: robustness, speed, poor acquisition, source separation or error concealment (the same topics, with generic names) are common for other data source.

As many data fields, this domain is being pervaded by (deep) learning techniques threatening the old handcraft (eg Learning Document Image Binarization from Data, Yue Wu et al., 2015).

DIBCO 2017, the ICDAR 2017 Document Image Binarization COmpetition, is still on, a good sign altogether, and a source of challenges.7

As a personal note, I have been very interested in the analysis of old written documents, and their authentification, based on:

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