I think your whole document needs enough surrounding margin - I found the empty page issue when my text was too close to the page edges. In your first image you have this but not your second.
Sent from my iPhone > On 26 Oct 2015, at 18:30, Daniel Kraft <[email protected]> wrote: > > Hi all! > > I've just started to experiment with tesseract (and OCR in general). I would > like to use it for reading sequences of numbers from pictures taken off an > old screen. I've trained tesseract to my situation, including the particular > font used on the screen and only numbers as characters. Recognition works > usually very well, with not a single mistake (e. g., confusing 0 with 8 or 1 > with 7) after training. > > However, sometimes tesseract simply refuses to recognise *any* content at > all, or only recognises text starting at some line half way through the > picture. I found [1], which seems to be related. However, resizing the > image canvas does not help me in my situation (see attachments and below). > > [1] https://groups.google.com/forum/#!topic/tesseract-ocr/eM7vClhtgw8 > > I've attached two images including the resulting text output (which cannot be > reproduced in this quality without training). The pictures are based on > photographs but have been preprocessed already to improve contrast. I don't > really see much of a difference in the visual quality between the "Failing" > and "Working" image, which makes me wonder why tesseract only outputs the > last lines of Failing while it gives perfect results (except for spurious > line breaks) in Working. Any ideas what the issue could be? Both images > have been created in the same way, with the same preprocessing parameters and > so on. > > Thanks a lot! Yours, > Daniel > -- > 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/73d8219e-933d-478a-bc71-40394f612e37%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > <Failing.png> > <Failing.txt> > <Working.png> > <Working.txt> -- 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/39285D0E-CA6C-43F4-9624-1F29B79A919F%40gmail.com. For more options, visit https://groups.google.com/d/optout.
