I use the full docker image of Tika 2.6, How can I check if I have it or not and where am i supposed to see the outcome of the OCR?
On Thu, 26 Jan 2023 at 22:25 Tim Allison <talli...@apache.org> wrote: > If tesseract is installed on your system and callable as 'tesseract' > and if you don't make any modifications via tika-config.xml, tesseract > will be applied to images automatically and to pages of PDFs that have > a) only a few characters (<10?) or b) have more than a handful of > unmapped unicode characters. > > On Thu, Jan 26, 2023 at 3:17 PM שי ברק <shai...@gmail.com> wrote: > > > > Does Tika support OCR on pdf, is there an endpoint or header for this? > > > > On Thu, 26 Jan 2023 at 21:54 Tim Allison <talli...@apache.org> wrote: > >> > >> Sorry, one more thing. > >> > >> If you use tika-eval's metadata filter, that will tell you that the > >> out of vocabulary statistic (an indicator of "garbage") would likely > >> be quite high for this file. > >> > >> On Thu, Jan 26, 2023 at 2:51 PM Tim Allison <talli...@apache.org> > wrote: > >> > > >> > A user dm'd me with an example file that contained English and Arabic. > >> > The Arabic that was extracted was gibberish/mojibake. I wanted to > >> > archive my response on our user list. > >> > > >> > * Extracting text from PDFs is a challenge. > >> > * For troubleshooting, see: > >> > > https://cwiki.apache.org/confluence/display/TIKA/Troubleshooting+Tika#TroubleshootingTika-PDFTextProblems > >> > * Text extracted by other tools is also gibberish: Foxit, pdftotext > >> > and Mac's Preview > >> > * PDFBox logs warnings about missing unicode mappings > >> > * Tika reports that there are a bunch of unicode mappings missing per > >> > page. The point of this is that integrators might choose to run OCR > >> > on pages with high counts of missing unicode mappings. From the > >> > metadata: "pdf:charsPerPage":["1224","662"] > >> > "pdf:unmappedUnicodeCharsPerPage":["620","249"] > >> > > >> > Finally, if you want a medium dive on some of the things that can go > >> > wrong with text extraction in PDFs: > >> > > https://irsg.bcs.org/informer/wp-content/uploads/OverviewOfTextExtractionFromPDFs.pdf >
