ShreeDevi, Thanks for this -- I tried re-training tesseract with a range of exposure values passed to text2image, but didn't see improved results.
However, I did notice in the process that the x-heights for the document I was attempting to recognize were near the lower limit of what Tesseract can handle (~10px), so I doubled the image size. This resulted in much improved recognition; there are still errors, but fewer of them and they "make sense" now. Tesseract isn't able to segment the 5-column page layout very well, but otherwise I'm pretty happy with the results. Derek On Thu, Apr 2, 2015 at 10:16 AM, ShreeDevi Kumar <[email protected]> wrote: > Please see > > https://code.google.com/p/tesseract-ocr/source/browse/training/degradeimage.h > > https://code.google.com/p/tesseract-ocr/source/browse/training/degradeimage.cpp > > It maybe possible to do additional training using degraded versions of > 'synthetic' images which may improve recognition of older documents. > > ShreeDevi > ____________________________________________________________ > भजन - कीर्तन - आरती @ http://bhajans.ramparivar.com > > On Thu, Apr 2, 2015 at 7:05 PM, Sven Pedersen <[email protected]> > wrote: > >> Cool! Good work. I hope that will help the others who have been asking >> about Georgian for a couple years. :-) >> --Sven >> >> On Wed, Apr 1, 2015 at 9:28 PM, Derek <[email protected]> wrote: >> >>> I've recently finished training tesseract 3.03-rc1 on the Georgian >>> language, using tesstrain.sh and based off the files in the langdata >>> repository. I created my own word list and bigrams list using Wikipedia. >>> >>> Performance is very good on high-quality scans with modern fonts, but it >>> doesn't do very well on older documents; I'm not sure whether this is >>> because of differences in the font, or because the synthetic images >>> generated by the tesstrain.sh script don't give tesseract enough training >>> in handling degraded images. >>> >>> I've uploaded the traineddata file and all training files here: >>> https://dl.dropboxusercontent.com/u/11840441/kat_train20150401.zip >>> >>> I'm attaching a test image (a randomly-selected scan from Georgia's >>> registry of corporations) and the output of running tesseract recognition >>> on the test image. No pre-processing was done on the test image except to >>> upsample it to 300dpi. The test image contains some Latin characters so I >>> ran tesseract with the language selector "kat+eng". >>> >>> The licensing for any documents to which I hold the copyright is the >>> same as the tesseract source, i.e. the Apache License, Version 2.0 ( >>> http://www.apache.org/licenses/LICENSE-2.0). >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "tesseract-ocr" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at http://groups.google.com/group/tesseract-ocr. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/tesseract-ocr/ded0dcf6-e050-450b-8bcd-17dde924aafe%40googlegroups.com >>> <https://groups.google.com/d/msgid/tesseract-ocr/ded0dcf6-e050-450b-8bcd-17dde924aafe%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> >> >> -- >> ``All that is gold does not glitter, >> not all those who wander are lost; >> the old that is strong does not wither, >> deep roots are not reached by the frost. >> From the ashes a fire shall be woken, >> a light from the shadows shall spring; >> renewed shall be blade that was broken, >> the crownless again shall be king.” >> >> -- >> You received this message because you are subscribed to the Google Groups >> "tesseract-ocr" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/tesseract-ocr. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/tesseract-ocr/CAFTC0i5tzPcRkrspmQ0EREVtOXQ3ifsf_rP8TQ%2B7MaU3UkURhg%40mail.gmail.com >> <https://groups.google.com/d/msgid/tesseract-ocr/CAFTC0i5tzPcRkrspmQ0EREVtOXQ3ifsf_rP8TQ%2B7MaU3UkURhg%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to a topic in the > Google Groups "tesseract-ocr" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/tesseract-ocr/R_-9cduyixc/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/tesseract-ocr. > To view this discussion on the web visit > https://groups.google.com/d/msgid/tesseract-ocr/CAG2NduUXJuxf8orSD5OLG2A0zrbj4BqAbs6LkgB7t0mpUEnw1A%40mail.gmail.com > <https://groups.google.com/d/msgid/tesseract-ocr/CAG2NduUXJuxf8orSD5OLG2A0zrbj4BqAbs6LkgB7t0mpUEnw1A%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/tesseract-ocr. To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/CABjJQf%2BNdVKcy%3D2rf%2BwSQpPR98mN%3DpTX4m7BzC1ZGbDxKfSidg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
