we use leptonica 1.68 for preprocessing and tesseract 3.00. I can't speak to the speed (we do the OCR on the server) but leptonica does the preprocessing on the phone relatively well.
usually a sauvola binarization is all the preprocessing we need. max On Jul 22, 2011, at 12:34 AM, ap wrote: > I'm interested in the speed aspect as well. How fast will tesseract > run on the device, assuming I hand it bounding rectangles for text > areas? > > On Jul 20, 8:20 am, Cyril <[email protected]> wrote: >> Hi, >> >> I have some basic questions before starting a project of OCR >> recognition for the iPhone. >> >> I have seen the steps to cross-compile tesseract for iOS but have some >> questions on tesseract roadmap itself: >> 1/ should I start on tesseract 2.4 or 3.0? From my understanding 3.0 >> is not yet stable but has a major refactoring ongoing plus several >> features (including document layout analysis)? The current 3.0 >> "release" is quite far from the head of the trunk, which do not seem >> to compile on iOS, so I am wondering if there is any new release >> (3.01?) planned soon and compatible with iOS? >> 2/ is the accuracy and speed of the 3.0 release better or at least >> similar to the 2.4 release? >> 3/ is the document layout analysis already stable? A particular need I >> have is to be able to get the position of a particular recognized word >> in the document? Is this possible with tesseract? >> 4/ what is the typical preprocessing steps involved in OCR (b&w, >> threshold etc.)? Are they already performed by tesseract or do I need >> to perform them myself? If yes with which library is it usually done? >> Leptonica or OpenCV? >> >> I am also interested if you could give me pointers to code samples >> that demonstrate the API usage or tutorials on OCR concepts or on the >> APIs of tesseract. Any pointer to the state-of-the-art of OCR, >> including papers on useful preprocessing techniques impacting >> performance is also welcomed. >> >> I have seen that ScanBizCard is using tesseract 3.0. Do you have other >> examples of iPhone applications using Tesseract or concurrent >> solutions (commercial or open-source)? >> >> Thanks in advance for all your answers, >> >> Cyril > > -- > You received this message because you are subscribed to the Google > Groups "tesseract-ocr" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/tesseract-ocr?hl=en -- You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/tesseract-ocr?hl=en
