@jbarth-ubhd This what I got for the page you posted a week ago:
jrrthumben vnd dienſtbarkeit / ſo hartiglich geſtraf
fet / wie auß dieſer vnd ander geſchichtbuͤchern / zus
vernemen / Wird er on zweiffel wider vns noch an⸗
ders jemandt / gleich als im Roſengarten ſitzen /
vnd mit der warhafftigenlehr/Gottsdienſten/Re-
gimentẽ / sucht vnd erbarkeit / vnſers gefallens kurtz
weil vnd gauckelſpil treiben laſſen / Derhalben be⸗
ker vnd wende ſich noch meniglich / vnd ſuch guad
bey dem barmhertzigen Gott / dieweil die zu finden.
: Zumandern/fan auß ſolchen anzeigungen auch
etlicher maß / die warheit / vnd der recht Chriſtlich
glaub geſterckt werden] Dieweil deñoch hierauß er
ſcheint ¿mit welcherley grauſamer erſchrecklicher
vnzucht / auch wütenden blutgirigẽ vnmeßlichẽ we
ſen / Die gottloſen vnd Heyden / ſo die gnad Chriſti
verachtẽ / von Gott geſtrafft werde, Dz alfo jrs für
temens ſchleunige außrichtung | vnd des geivalts
mechtige erbreterunge / jnen zu verdamlichen ſcha⸗
den / vñ entlichen nachtheil vnd verderben gerathen
muß/zu beſtetigung jrs gottloſenwandels vü.heuf
fung der ſuͤnd / damit ſie auch Gotts zeitig rach er⸗
wecken welchs zorn bleibt ob dem vnglaubigen.
Zum dritten / dienen gleichwol der gſtalt bücher]
zu vnterricht der lands art / der leute gewonheit / ge⸗
brauch vnd ſitten / Auch zu erinnerung der vrſach
durch welche menſchlich paron u reden) bißher
dd HY
We definitely have to work on the special characters. Otherwise, it is pretty okay.
note: IMO you can squash these...
IMHO, tesserocr-segment-line is often more reliable.
I wonder why sauvola-ms-split "k" is so much different from sauvola without "ms"; see another comparison with different scales and k-values (0.17, 0.34, 0.68) here: https://digi.ub.uni-heidelberg.de/diglitData/jb/ocrd-binarize3.html . Sauvola-ms is loosing information on low contrast earlier than "without ms". And in many cases there are no so very different-scale fonts besides journal title on the first page. Larger fonts are often thinner, too, so I do not see where the advantage of "ms" is.
- Use
sauvola-ms-split!
I wonder why sauvola-ms-split "k" is so much different from sauvola without "ms"
This is strange indeed. Sauvola-multiscale appears to be defunct in the lower-contrast half, regardless of k. I will investigate.
Meanwhile, you should also know that in the original paper that introduced it (https://www.researchgate.net/publication/271923570_Efficient_Multiscale_Sauvola's_Binarization), the default choice of k was different at all scales (0.2 at lowest, 0.3 at medium scales, 0.5 at highest), and had been empirically determined as the optimum (as had Sauvola's original k=0.34). But the Olena implementation then silently creeped away from that decision over the years by overriding with equal k at all scales. (And that's also what we locked on in our OCR-D wrapper). I will fix that soon though – see discussion here.
so I do not see where the advantage of "ms" is.
Our recommendation was based on a slight advantage in direct OCR CER comparison on OCR-D GT (see here). In that setting, we used the default k, which really just might have been the 0.2/0.3/0.5 scheme as originally intended but I'm not sure.
ocrd-olena-binarize -p '{"impl":"sauvola"}'
sbb_textline_detector with https://qurator-data.de/sbb_textline_detector/
ocrd-calamari-recognize with https://qurator-data.de/calamari-models/
Note (for those who have to deal with layout data): We now have converters for segmentation from/into COCO and from/into color-coded mask images:
ocrd-segment-extract-pages(now exports mask images and COCO, too)ocrd-segment-from-masks(new, imports mask images)ocrd-segment-from-coco(new, imports COCO file)
These also try to convert PAGE region @type and @custom=subtype. Mask images by default use color scheme from PAGEViewer. Import from PubLayNet is also supported (i.e. no need for https://github.com/bertsky/ocrd_publaynet).
