What is your tesseract version? Zdenko
ut 29. 1. 2019 o 20:40 Jan Pohanka <xhpoha...@gmail.com> napísal(a): > Thanks for suggestions. You are right that I'm reffering to api.GetUTF8Text() > call, it is my bottleneck. > I was not aware that there is some fast and best models in tesseract 4.0, > I will give it a try. So far I used just lang=eng or osd. > For me it is suspicious that the calls are getting longer during the time. > Or to be more precise, first 10-15 calls are up to 500ms and latter ones > rise above 1s... > SetSourceResolution outside of the loop gives no change unfortunately. > > BR > Jan > > Dne úterý 29. ledna 2019 18:08:49 UTC+1 Lorenzo Blz napsal(a): >> >> >> First double check if the Pi is not throttling due to overheating or lack >> of USB power. This may cause the slowdown. >> >> Usually 30/50 px of text height is fine. IF the problem is tesseract, try >> to use the fast model (or "normal" if using best). I assume you are using >> the 4.x release. >> >> Try tesseract -v to see if you are using all the available CPU >> optimizations. >> >> Try to move the SetSourceResolution outside the loop and see if it >> changes something (MAYBE it may invalidate some caches or something). >> >> The time you are referring to is one single api.GetUTF8Text() call, >> correct? >> >> >> Lorenzo >> >> >> Il giorno mar 29 gen 2019 alle ore 17:48 Jan Pohanka <xhpo...@gmail.com> >> ha scritto: >> >>> Hello, >>> >>> I'm making a simple device used to recognize numbers on pictures taken >>> by a webcam. All is running on raspberry pi 3. >>> Everything is like following simple loop (in python for simplicity, but >>> using C++ api it is the same), images are preprocessed to black and white >>> >>> api = PyTessBaseAPI(psm=tesserocr.PSM.SINGLE_WORD) >>> >>> for im in images: >>> api.SetImage(im) >>> api.SetSourceResolution(70) >>> ot = api.GetUTF8Text() >>> >>> api.End() >>> >>> >>> My problem is that api.GetUTF8Text() call is quite slow and more over it >>> is getting slower and slower over time. Is there any options how to make >>> recognition faster? I have tried to resize the image to around 50x10px. The >>> times starts on around 300ms but then goes up to above 1s which is too slow >>> for me. I tried both legacy and LSTM algorithms, but they are similar. >>> >>> best regards >>> Jan >>> >>> -- >>> 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 tesseract-oc...@googlegroups.com. >>> To post to this group, send email to tesser...@googlegroups.com. >>> Visit this group at https://groups.google.com/group/tesseract-ocr. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/tesseract-ocr/a53b4b25-97e3-47dc-823a-cbb219225eed%40googlegroups.com >>> <https://groups.google.com/d/msgid/tesseract-ocr/a53b4b25-97e3-47dc-823a-cbb219225eed%40googlegroups.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 tesseract-ocr+unsubscr...@googlegroups.com. > To post to this group, send email to tesseract-ocr@googlegroups.com. > Visit this group at https://groups.google.com/group/tesseract-ocr. > To view this discussion on the web visit > https://groups.google.com/d/msgid/tesseract-ocr/baa59c86-b002-4607-8dda-16835cd3ea73%40googlegroups.com > <https://groups.google.com/d/msgid/tesseract-ocr/baa59c86-b002-4607-8dda-16835cd3ea73%40googlegroups.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 tesseract-ocr+unsubscr...@googlegroups.com. To post to this group, send email to tesseract-ocr@googlegroups.com. Visit this group at https://groups.google.com/group/tesseract-ocr. To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/CAJbzG8zz7qHPj-MF621Tnmqi3eHN_HOWHBqLm0ZFQ4cPs6MZ5Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
