Looking for segmentation algorithm implementations and (G)UIs

[Rainer Verteidiger]

Dear all,

I'm looking for a list (not https://tesseract-ocr.github.io/tessdoc/User-Projects-%E2%80%93-3rdParty) comparing various segmenters (AI-based or otherwise) that could be used instead of Tesseract's built-in segmenter, and also one comparing GUIs that could be used for improving automatic segmentation results, i.e. for further training of an AI-based segmenter or for smoothing out errors in the results of a non-trainable one.

Here are the ones I'm currently aware of (excluding vapourware and abandoned/unmaintained projects):

Segmenters:

- https://github.com/lquirosd/P2PaLA (AI-based; does both, bounding boxes and baselines)

- https://github.com/mittagessen/kraken (AI-based; old version did bounding boxes, seems to be switching to baselines now, judging from the Issues)

GUIs:

- https://transkribus.eu/Transkribus/ (desktop client that seems to use P2PaLA on the server side; many features cloud-only, but nice, intuitive editing UI)

- https://github.com/mauvilsa/nw-page-editor (UI not as user-friendly; needs a lot of getting used-to, but seems quite powerful)

- https://github.com/mittagessen/kraken (old version produces HTML pages that can be edited and saved again)

- https://wiki.gnome.org/Apps/OCRFeeder (uses a homebrewn XML format, sadly no PageXML, etc.)

Any input would be appreciated :)

Best regards

Rainer

[Shree Devi Kumar]

Good collection of segmentation algorithms.

Dan Bloomberg has update the segmentation algorithms in leptonica some time back. You may want to take a look at those too. 

Tesseract also uses leptonica, but older algorithms, I think.

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