Patrick, I ran into your answer and I think you might be able to help me given that your scanbizcards app is doing similar processing to what I need (don't worry, no competition :) ).
I'm using tesseract-ocr on android, taking pictures of portions of receipts in grayscale mode (EFFECT_MONO, if available on device), and converting the bitmap to ARGB_888 for tesseract processing. I'm getting pretty good results, but am trying to improve accuracy. Do you know whether you do any other preprocessing of the bitmap before passing to tesseract, like perhaps converting to black/white (you mentioned in your above answer you're passing "black & white image"). I tried out your app and it seems to give better results than mine on similar types of images. Very nice app, BTW. Thanks, Tin On Monday, 17 December 2012 04:02:34 UTC+1, Patrick Questembert wrote: > > I think you are right - ScanBizCards is passing a black & white image to > Tesseract and we are pretty sure Tesseract doesn't change the image > (empirically - we never dug in to make sure). > > Patrick > > On Sun, Dec 16, 2012 at 9:44 PM, Linda Li <[email protected]<javascript:> > > wrote: > >> If I pass a binary (black-white) image into tesseract-ocr, will tesseract >> process the image on its own way? >> >> >> It seems tesseract ocr uses Otsu global thresholding method (not >> looking into the code carefull yet, but saw the key word “otsu” in the >> source code) >> >> If so, the Otsu method will not change the binary (black-white) image. >> >> >> So in my understanding, tesseract-ocr will not change the input binary >> image. >> >> Just ask to make sure... >> >> >> Thanks. >> >> -- >> 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]<javascript:> >> To unsubscribe from this group, send email to >> [email protected] <javascript:> >> For more options, visit this group at >> http://groups.google.com/group/tesseract-ocr?hl=en >> > > > > -- > Patrick Questembert, *ScanBizCards* > +1-917-250-4177 | www.scanbizcards.com > twitter.com/ScanBizCards | www.facebook.com/ScanBizCards > Just released: Power Contacts - > http://itunes.apple.com/us/app/power-contacts/id476986356?mt=8 > > -- 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
